JP KENNY
SW WAVE HUB - METOCEAN
DESIGN BASIS
Report No. 2056, REV 1
Issued 29 April 2009
Metoc plc
Exchange House
Liphook
Hants GU30 7DW
United Kingdom
Tel: +44 (0) 1428 727800
Fax: +44 (0) 1428 727122
E-mail: [email protected]
Web Site: www.metoc.co.uk
DOCUMENT RELEASE FORM
SW WAVE HUB - METOCEAN DESIGN BASIS
Title:
Client:
JP KENNY
Metoc Document No:
2056
Date of Issue:
29 April 2009
Level of Issue:
REV 1
Distribution:
Hard Copy
Digital
JP KENNY
No: n/a
PDF
Metoc plc
No: n/a
PDF
Prepared By:
Jung Daruvala
File Reference:
TMAR50
Project No:
P1209A
Project Manager:
Authoriser:
Jung Daruvala
Nick Barcock
Rev No
Date
Reason
Author
Checker
Authoriser
Rev 0
8.4.09
Draft for client comment
JFD
KRM
NWB
Rev 1
28.4.09
Approved by client
JFD
KRM
NWB
COPY NUMBER: (applies to hard copies only)
JP KENNY
SW WAVE HUB - METOCEAN DESIGN BASIS
SUMMARY
This report provides the metocean design basis for the shore export cable of the SW Wave
Hub Project, an offshore facility that will allow wave energy conversion devices to connect to
the National Grid. The Wave Hub will be located north of St Ives in a seafloor depth around
50-60 m. The export cable will come ashore in St Ives Bay, a route of 24.5 km. The Project
is owned by the SW Regional Development Agency (SWRDA), which has commissioned JP
Kenny to manage the design and installation of the cable.
This work is carried out under authorisation of JP Kenny Service Order No 6600-e dated 19
February 2009 and the terms of the General Agreement for Provision of Consultancy and
Technical Services between JP Kenny and Metoc dated 9 August 2004.
Metocean design criteria are provided at 15 locations along the cable route between KP1.25
(chart depth 1 m) and the hub. They include waves, current, water levels and seawater
properties. Values are given in eight directional sectors for monthly cases with 1 year return
period and all-year cases with return periods 1, 10, 50 and 100 years. Operational wind data
(monthly exceedence of wind speeds) are also provided.
Wave criteria have been prepared by wave refraction modelling. For waves approaching
from the ocean, model inputs are extreme sea states at the model boundary, calculated from
Met Office model archive data; the model simulates the transformation of wave properties
due to changing bathymetry with progress shoreward. For sheltered sectors (E, SE, S)
extreme winds are input and the model calculates wave growth.
Site specific wave
measurements, collected at the Wave Hub, have been made available to help define wave
characteristics.
Current and water level criteria have been prepared using data from a selection of models
operated by Proudman Oceanographic Laboratory (POL) in conjunction with a hydrodynamic
model that Metoc runs in-house.
The metocean criteria presented here are intended for use in final engineering design of the
cable.
In parallel with this report, Metoc has conducted a cable burial depth study, reported
separately (Metoc Report 2057).
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SW WAVE HUB - METOCEAN DESIGN BASIS
CONTENTS
1
INTRODUCTION.................................................................................................. 1
1.1 OBJECTIVES ........................................................................................................... 1
1.2 LOCATION .............................................................................................................. 1
1.3 APPROACH ............................................................................................................. 2
2
WAVES ................................................................................................................ 3
2.1 EXTREME WAVE PARAMETERS ................................................................................. 3
2.2 FATIGUE WAVES ..................................................................................................... 3
2.3 OPERATIONAL WAVES ............................................................................................. 3
3
CURRENT............................................................................................................ 4
3.1 PRESENTATIONS..................................................................................................... 4
3.2 SUPPORTING INFORMATION ..................................................................................... 4
3.3 COMPARISON AGAINST OTHER SOURCES .................................................................. 4
4
WIND.................................................................................................................... 6
4.1 OPERATIONAL WIND ................................................................................................ 6
5
WATER LEVELS ................................................................................................. 7
6
SEAWATER PROPERTIES ................................................................................ 8
7
REFERENCES..................................................................................................... 9
APPENDIX A
EXTREME WAVES BY MONTH.....................................................A-1
APPENDIX B
WAVE MODEL PLOTS ...................................................................B-1
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SW WAVE HUB - METOCEAN DESIGN BASIS
TABLES
TABLE 2.1A WAVE CRITERIA - RETURN PERIOD 100 YEARS
TABLE 2.1B WAVE CRITERIA - RETURN PERIOD 50 YEARS
TABLE 2.1C WAVE CRITERIA - RETURN PERIOD 10 YEARS
TABLE 2.1D WAVE CRITERIA - RETURN PERIOD 1 YEAR
TABLE 2.1E WAVE SPREADING PARAMETER FOR USE WITH DESIGN WAVES
TABLE 2.2 INDIVIDUAL WAVE HEIGHT DISTRIBUTION - KP 24.5, BY DIRECTION
TABLE 2.3 INDIVIDUAL WAVE HEIGHT DISTRIBUTION - PER LOCATION, NON-DIRECTIONAL
TABLE 2.4A SIGNIFICANT WAVE HEIGHT AT WAVE HUB - NUMBER OCCURRENCE
TABLE 2.4B SIGNIFICANT WAVE HEIGHT AT WAVE HUB – PERCENT EXCEEDENCE
TABLE 2.4C SIGNIFICANT WAVE HEIGHT AT WAVE HUB – EXCEEDENCE CURVES
TABLE 2.5A SIGNIFICANT WAVE HEIGHT AND DIRECTION AT WAVE HUB – ANNUAL
TABLE 2.5B SIGNIFICANT WAVE HEIGHT AND DIRECTION AT WAVE HUB – DEC-FEB
TABLE 2.5C SIGNIFICANT WAVE HEIGHT AND DIRECTION AT WAVE HUB – MAR-MAY
TABLE 2.5D SIGNIFICANT WAVE HEIGHT AND DIRECTION AT WAVE HUB – JUN-AUG
TABLE 2.5E SIGNIFICANT WAVE HEIGHT AND DIRECTION AT WAVE HUB – SEP-NOV
EXTREME CURRENT SPEEDS AT WAVE HUB CABLE
TABLE 3.1.1 - DEPTH 1 M CD (APPROX KP 1.2)
TABLE 3.1.2 - DEPTH 2 M CD, APPROX KP 1.25
TABLE 3.1.3 - DEPTH 3 M CD, APPROX KP 1.3
TABLE 3.1.4 - DEPTH 4 M CD, APPROX KP 1.35
TABLE 3.1.5 - DEPTH 5 M CD, APPROX KP 1.4
TABLE 3.1.6 - DEPTH 6 M CD, APPROX KP 1.5
TABLE 3.1.7 - DEPTH 8 M CD, APPROX KP 1.65
TABLE 3.1.8 - DEPTH 10 M CD, APPROX KP 1.85
TABLE 3.1.9 - DEPTH 12 M CD, APPROX KP 2.15
TABLE 3.1.10 - DEPTH 15 M CD, APPROX KP 3.5
TABLE 3.1.11 - DEPTH 20 M CD, APPROX KP 4.3
TABLE 3.1.12 - KP 10
TABLE 3.1.13 - KP 15
TABLE 3.1.14 - KP 20
TABLE 3.1.15 - KP 24.5 (HUB END)
TABLE 4.1A WIND SPEED AT WAVE HUB - NUMBER OCCURRENCE
TABLE 4.1B WIND SPEED AT WAVE HUB – PERCENT EXCEEDENCE
TABLE 4.1C WIND SPEED AT WAVE HUB – EXCEEDENCE CURVES
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SW WAVE HUB - METOCEAN DESIGN BASIS
TABLE 5.1 TIDE AND EXTREME STILL WATER LEVELS AT WAVE HUB (KP 24.5)
TABLE 5.2 TIDE AND EXTREME STILL WATER LEVELS NEAR SHORE END (KP 1.25)
TABLE 6.1 SEAWATER PROPERTIES WITH DEPTH
TABLE 6.2 SEAWATER PROPERTIES BY MONTH
TABLE 6.3 SEAWATER TEMPERATURE BY MONTH
FIGURES
FIGURE 1.1 SKETCH MAP .............................................................................................................1
FIGURE 1.2 LOCATIONS FOR METOCEAN CRITERIA .........................................................................2
FIGURE 3.1 DRIFTER TRACKS IN AREA...........................................................................................5
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SW WAVE HUB - METOCEAN DESIGN BASIS
1
INTRODUCTION
1.1
OBJECTIVES
JP Kenny is designing and managing the installation of the export power cable
for the Wave Hub Project, an offshore facility that will allow wave energy
conversion devices to connect to the National Grid. The Wave Hub will be
located north of St Ives in a seafloor depth around 50-60 m. Its export cable
will come ashore in St Ives Bay, a route of 24.5 km.
This report provides the metocean design basis for the cable. The work is
carried out for JP Kenny under authorisation of their Service Order No 6600-e
dated 19 February 2009 and the terms of the General Agreement for Provision
of Consultancy and Technical Services between JP Kenny and Metoc dated
9 August 2004.
1.2
LOCATION
Figure 1.1 Sketch map
50.75°N
50.50°N
Cable (Halcrow )
Wave Farm
EU w ave model
UK w ave model
50.25°N
EU w ind model
Wave Buoy
Seven Stones LV
POL CS20
50.00°N
49.75°N
6.5°W
6.0°W
5.5°W
5.0°W
The Wave Hub is exposed to the Atlantic Ocean and therefore is subject to
considerable wave action from the west and southwest; the shore end of the
route benefits from comparative shelter within St Ives Bay.
Figure 1.1 sketches the locations of a selection of the metocean data used in
this study.
Figure 1.2 below shows the locations for which metocean criteria are provided
here. Locations within St Ives Bay are defined by seafloor depth; those outside
the Bay are defined by chainage.
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SW WAVE HUB - METOCEAN DESIGN BASIS
Figure 1.2 Locations for metocean criteria
60,000
Hub, KP 24.5
55,000
KP 20
50,000
KP 15
Cable (Halcrow )
Chainage
depths
KP 10
45,000
20 m
15 m
40,000
1-12 m
35,000
140,000
145,000
150,000
155,000
160,000
Easting
1.3
APPROACH
Metoc prepared these design criteria using a mature methodology that is well
recognised throughout the offshore industry. It is consistent with guidance
published by HSE (2001) and the international metocean standard
ISO 19901-1.
Wave measurements near the hub have been examined to provide information
on wave steepness and wave spreading.
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2
WAVES
2.1
EXTREME WAVE PARAMETERS
Tables 2.1a-d present extreme wave parameters with return periods of 100, 50,
10 and 1 year.
Appendix Tables A1-A12 give monthly extremes with a return period of 1 year.
Monthly values are derived from 3-month seasons centred on the desired
month (e.g. extremes for July are based on data for June, July and August).
Values are given in eight directional sectors centred on the cardinal points.
Wave parameters are as follows:
Hs
Significant wave height
Tz
Mean zero-upcrossing wave period
Tp
Spectral peak period
Hmax Maximum individual trough-to-crest wave height in 3 hours
Tmax (range of) wave period associated with Hmax
Gamma, the spectral peakedness parameter
Table 2.1e shows the wave spreading parameter, s, which may be used in
conjunction with these extremes. Separate values are given for winter (OctMar) and summer (May-Sep).
Appendix B shows relevant outputs of the wave refraction model.
2.2
FATIGUE WAVES
Table 2.2 shows the total number of individual waves in a year at the wave hub.
The annual number of waves at the wave hub has been derived from the
average wave period seen in wave rider buoy data collected at the site.
Numbers are broken down by direction sector, inferred from the Met Office
model data.
Numbers of individual waves within each height class are calculated by
distributing the total number from zero height to 1-year extreme Hmax in a
negative exponential distribution.
Table 2.3 shows non-directional numbers of waves in a year at other parts of
the route.
2.3
OPERATIONAL WAVES
Table 2.4 shows monthly exceedence of significant wave height at the hub.
The values are based on 8 years of data from the Met Office UK Waters model
at a grid point close to the hub.
Tables 2.5a-e are joint frequency distribution tables of significant wave height
versus wave direction; for all year and by season.
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3
CURRENT
3.1
PRESENTATIONS
Tables 3.1.1-3.1.15 each provide a full suite of extreme current criteria for one
location along the cable route. The locations correspond to those provided for
extreme wave criteria.
Each table shows directional currents at surface and at 1 m height above
seafloor; annual values are given for return periods of 1, 10, 50 and 100 years,
and monthly values are given for 1 year.
The tables also show location identifiers, tide and surge parameters and the
profile shape assumed to apply. The profile follows a 1/10th power law (speed
varies as the 1/10th power of variation in height) in the lower 70% of the water
column. Above that height, speed is uniform to the surface.
Current roses with each table show the mean spring tidal ellipse, 50-year surge
in 8 direction sectors and their combined total (which exceeds the sum of their
parts). Tide-and-surge combinations have been derived using factors empirical
to the nearby standard port of Newlyn.
3.2
SUPPORTING INFORMATION
Metoc built a high-resolution 2-dimensional hydrodynamic model to simulate
tidal streams within the area surrounding the cable route. The model is driven
at its boundaries by tidal elevations prepared from Proudman Oceanographic
Laboratory’s (POL’s) CS20 model. It is validated at its interior, i.e. several
points along the cable route, against CS20 tidal currents. Metoc analysed
harmonic constituents from one year of CS20 data at several sites on the
offshore boundary and along the cable route.
3.3
COMPARISON AGAINST OTHER SOURCES
Metoc has calculated surface current velocities from observed trajectories of
surface drifters in and around the study area. A limited number of data are
available; the drifters generally move at around 0.2 m/s and the highest speed
seen in the data was 0.65 m/s (values are averaged over 6 hours).
Figure 3.1 below is a sketch map showing the area covered and the reported
tracks; the higher speeds were comparatively close to the hub area.
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SW WAVE HUB - METOCEAN DESIGN BASIS
Figure 3.1 Drifter tracks in area
51.33°N
51.00°N
Wave Farm
Cable route
50.67°N
drifter tracks
50.33°N
50.00°N
7.0°W
6.5°W
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5.5°W
5
5.0°W
4.5°W
4.0°W
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SW WAVE HUB - METOCEAN DESIGN BASIS
4
WIND
4.1
OPERATIONAL WIND
Table 4.1 shows the monthly exceedence of wind speeds applicable at the
wave hub and in the general area away from the shore. The data were
measured at Seven Stones Light Vessel over the period Sep 2001- Jan 2009.
Metoc has reviewed the data quality and found the data to be of an acceptable
standard for the present study. They show slightly higher speeds than the UK
Met Office Model, which is probably due to the model’s spatial averaging.
[The same data have been used to derive extreme wind speeds for input to the
wave refraction modelling wind-driven cases].
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SW WAVE HUB - METOCEAN DESIGN BASIS
5
WATER LEVELS
Table 5.1 presents a full suite of water levels at the wave hub. These include
all standard tidal heights, storm surge combined (tide and surge) total still water
levels, and extreme including wave crests for 50- and 100-year return periods.
Table 5.2 gives the equivalent information near the shore end of the route
(KP 1.25). The tide and surge levels show little variation along the route; only
wave crest heights differ markedly. Spatial variations of both tide and surge
have been checked against, and are consistent with, their disposition as seen in
references such as HSE, 2001.
Note that Lowest Astronomical Tide (LAT), which occurs every 19 years, is
actually lower than the 100-year extreme low water level. This apparent
paradox arises because LAT is substantially (0.4 m) lower than the tidal level
(MLWS) assumed to contribute to the joint tide-and-surge extreme. The n-year
extremes should be used in conjunction with extreme sea states, whereas LAT
is more appropriate when considering water levels in isolation.
Tidal heights are scaled from the nearby standard port of Newlyn to the site in
the ratio of their tidal amplitudes. Those for the site are determined by
harmonic analysis of data extracted from Metoc’s hydrodynamic model.
Storm surge heights are derived from POL’s Continental Shelf Model, which
has simulated storm surges throughout UK waters during a selection of severe
historical storms.
Extreme water levels are determined by combining high tide and storm surges
in a ratio empirical to Newlyn. Wave crest elevations are derived from wave
height, wave period and water depth using a formulation attributed to Tung and
Huang, modified by Tucker.
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SW WAVE HUB - METOCEAN DESIGN BASIS
6
SEAWATER PROPERTIES
Table 6.1 illustrates the variation of seawater properties with depth. Note that
the data extend beyond the maximum depth of the cable route; assume that
values seen at a particular depth are valid at that depth throughout the study
area.
Table 6.2 illustrates their variation with time of year (showing all depths
together).
Table 6.3 tabulates the monthly variations of seawater temperature. Values
are given for separate depth ranges.
The presentations are based on more than 12,000 data collected by scientific
institutions during the last century (1909-2007) in a small area around the site
(49-51°N, 5-7°W).
The original data comprise temperature, salinity and depth. Metoc has derived
seawater density from these using algorithms published by UNESCO.
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SW WAVE HUB - METOCEAN DESIGN BASIS
7
REFERENCES
Det Norske Veritas. Offshore Standard DNV-OS-J101 Design of Offshore Wind
Turbine Structures. October 2007
Det Norske Veritas. Recommended Practice DNV-RP-F105 Free Spanning
Pipelines. February 2006
HSE. Environmental Considerations.
2001/010. HSE, 2001
Offshore Technology Report OTO
International Standards Organisation. BS EN ISO 19901-1:2005. Petroleum
and natural gas industries. Specific requirements for offshore structures.
Metocean design and operating considerations
Proudman Oceanographic Laboratory, 1990. Atlas of Tidal Elevations and
Currents around the British Isles. Offshore Technology Report OTH-89-293
UK Dept Energy, 1990. Metocean Parameters – Parameters Other than Waves
(Supporting document to Guidance Notes). OTH 89 299
UK Dept Energy, 1990. Metocean Parameters – Wave Parameters (Supporting
document to Guidance Notes). OTH 89 300
UK Hydrographic Office. Admiralty Tide Tables Volume 1 2008.
Kingdom and Ireland including European Channel Ports. NP 201-08.
United
UNESCO. Algorithms for Computation of Fundamental Properties of Seawater.
Technical Papers in Marine Science, 44. 1983.
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TABLES
TABLE 2.1A WAVE CRITERIA - RETURN PERIOD 100 YEARS
TABLE 2.1B WAVE CRITERIA - RETURN PERIOD 50 YEARS
TABLE 2.1C WAVE CRITERIA - RETURN PERIOD 10 YEARS
TABLE 2.1D WAVE CRITERIA - RETURN PERIOD 1 YEAR
TABLE 2.1E WAVE SPREADING PARAMETER FOR USE WITH DESIGN WAVES
TABLE 2.2 INDIVIDUAL WAVE HEIGHT DISTRIBUTION - KP 24.5, BY DIRECTION
TABLE 2.3 INDIVIDUAL WAVE HEIGHT DISTRIBUTION - PER LOCATION, NON-DIRECTIONAL
TABLE 2.4A SIGNIFICANT WAVE HEIGHT AT WAVE HUB - NUMBER OCCURRENCE
TABLE 2.4B SIGNIFICANT WAVE HEIGHT AT WAVE HUB – PERCENT EXCEEDENCE
TABLE 2.4C SIGNIFICANT WAVE HEIGHT AT WAVE HUB – EXCEEDENCE CURVES
TABLE 2.5A SIGNIFICANT WAVE HEIGHT AND DIRECTION AT WAVE HUB – ANNUAL
TABLE 2.5B SIGNIFICANT WAVE HEIGHT AND DIRECTION AT WAVE HUB – DEC-FEB
TABLE 2.5C SIGNIFICANT WAVE HEIGHT AND DIRECTION AT WAVE HUB – MAR-MAY
TABLE 2.5D SIGNIFICANT WAVE HEIGHT AND DIRECTION AT WAVE HUB – JUN-AUG
TABLE 2.5E SIGNIFICANT WAVE HEIGHT AND DIRECTION AT WAVE HUB – SEP-NOV
EXTREME CURRENT SPEEDS AT WAVE HUB CABLE
TABLE 3.1.1 - DEPTH 1 M CD (APPROX KP 1.2)
TABLE 3.1.2 - DEPTH 2 M CD, APPROX KP 1.25
TABLE 3.1.3 - DEPTH 3 M CD, APPROX KP 1.3
TABLE 3.1.4 - DEPTH 4 M CD, APPROX KP 1.35
TABLE 3.1.5 - DEPTH 5 M CD, APPROX KP 1.4
TABLE 3.1.6 - DEPTH 6 M CD, APPROX KP 1.5
TABLE 3.1.7 - DEPTH 8 M CD, APPROX KP 1.65
TABLE 3.1.8 - DEPTH 10 M CD, APPROX KP 1.85
TABLE 3.1.9 - DEPTH 12 M CD, APPROX KP 2.15
TABLE 3.1.10 - DEPTH 15 M CD, APPROX KP 3.5
TABLE 3.1.11 - DEPTH 20 M CD, APPROX KP 4.3
TABLE 3.1.12 - KP 10
TABLE 3.1.13 - KP 15
TABLE 3.1.14 - KP 20
TABLE 3.1.15 - KP 24.5 (HUB END)
TABLE 4.1A WIND SPEED AT WAVE HUB - NUMBER OCCURRENCE
TABLE 4.1B WIND SPEED AT WAVE HUB – PERCENT EXCEEDENCE
TABLE 4.1C WIND SPEED AT WAVE HUB – EXCEEDENCE CURVES
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SW WAVE HUB - METOCEAN DESIGN BASIS
TABLE 5.1 TIDE AND EXTREME STILL WATER LEVELS AT WAVE HUB (KP 24.5)
TABLE 5.2 TIDE AND EXTREME STILL WATER LEVELS NEAR SHORE END (KP 1.25)
TABLE 6.1 SEAWATER PROPERTIES WITH DEPTH
TABLE 6.2 SEAWATER PROPERTIES BY MONTH
TABLE 6.3 SEAWATER TEMPERATURE BY MONTH
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Hs (m) at KP 24.5
Hs (m) at KP 15
N
N
NW
NE
10
15
NE
10
5
W
N
15
15
NW
Hs (m) at KP 1.5
NW
5
0
E
SW
SE
W
5
E
0
SW
SE
S
W
E
0
SW
SE
S
8 m Still water level above CD
NE
10
S
0.78 H/d breaking limit
Extreme significant wave height, Hs (m)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
4.9
5.3
5.5
5.7
5.8
5.9
6.1
6.3
6.6
7.3
7.8
10.1
11.7
12.2
13.7
N
4.6
4.8
5.0
5.1
5.1
5.2
5.2
5.2
5.1
5.9
6.1
6.4
6.7
6.3
6.7
100-year
NE
1.5
1.5
1.6
1.6
1.6
1.7
1.7
1.7
1.8
3.3
4.0
5.1
5.0
5.3
5.5
E
0.5
0.5
0.6
0.6
0.6
0.7
0.7
0.8
0.8
1.2
1.6
2.3
2.7
2.9
3.1
SE
0.2
0.2
0.3
0.3
0.3
0.3
0.3
0.3
0.4
0.7
0.9
1.4
1.8
2.1
2.3
S
0.3
0.4
0.4
0.4
0.4
0.4
0.4
0.5
0.6
1.0
1.1
1.4
2.2
2.6
2.9
E
2.3
2.4
2.5
2.6
2.6
2.8
2.8
3.0
3.2
4.0
4.5
5.3
5.6
5.9
6.0
SE
1.6
1.7
1.7
1.7
1.8
1.8
1.9
2.0
2.1
2.7
3.1
4.0
4.5
4.9
5.1
S
SW
W
NW
2.0
2.6
5.4
7.8
2.0
2.6
5.4
8.2
2.1
2.7
5.4
8.4
2.1
2.7
5.5
8.5
2.2
2.8
5.5
8.6
2.2
2.8
5.5
8.7
2.3
2.9
5.6
8.8
2.4
3.0
5.7
8.8
2.6
3.3
5.8
8.9
3.2
4.2
10.9
9.2
3.4
4.9
10.9
9.3
4.1
11.6
10.8
9.8
5.0
11.6
11.8
9.9
5.4
11.7
12.9
10.0
5.7
11.8
13.4
10.0
Prepared by Metoc plc 1 April 2009
Mean zero-upcrossing wave period Tz (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
7.8
8.2
8.4
8.5
8.6
8.7
8.8
8.8
8.9
9.2
9.3
10.8
11.8
12.9
13.4
N
7.7
7.9
8.1
8.2
8.3
8.3
8.4
8.4
8.4
8.5
8.6
8.8
8.8
8.8
8.9
NE
5.1
5.1
5.1
5.1
5.0
5.0
5.0
5.0
5.0
7.7
7.7
7.9
7.9
7.9
7.9
SW
0.7
0.7
0.8
0.8
0.8
0.8
0.9
0.9
1.0
1.3
1.6
5.1
8.8
10.6
10.0
W
1.9
2.0
2.0
2.0
2.1
2.1
2.2
2.2
2.4
5.6
6.1
10.1
11.7
12.2
13.7
NW
4.9
5.3
5.5
5.7
5.8
5.9
6.1
6.3
6.6
7.3
7.8
8.0
8.0
8.5
8.6
100-year
SW Wave Hub Shore Export Cable - Metocean Design Basis
Table 2.1a Wave criteria - Return Period 100 years
I:\P1209_JPKenny\R2056 metocean\Table 2.1.xls T2.1a 09/04/2009 15:53
p 1 of 3
8 m Still water level above CD
0.78 H/d breaking limit
Period of peak spectral energy Tp (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
10.0
10.4
10.6
10.8
11.0
11.1
11.2
11.2
11.3
11.6
11.8
13.7
15.0
16.3
17.0
N
9.7
10.1
10.3
10.4
10.5
10.6
10.6
10.7
10.7
10.8
10.9
11.1
11.2
11.2
11.2
100-year
NE
6.5
6.5
6.5
6.4
6.4
6.4
6.4
6.3
6.3
9.7
9.7
10.0
10.0
10.1
10.1
E
2.9
3.0
3.2
3.3
3.4
3.5
3.6
3.8
4.0
5.0
5.7
6.7
7.1
7.5
7.6
SE
2.1
2.1
2.2
2.2
2.2
2.3
2.4
2.5
2.7
3.4
3.9
5.1
5.7
6.2
6.5
S
2.5
2.6
2.6
2.7
2.7
2.8
2.9
3.1
3.3
4.0
4.3
5.1
6.3
6.9
7.3
SW
3.3
3.4
3.4
3.5
3.5
3.6
3.7
3.8
4.2
5.3
6.2
14.8
14.8
14.9
14.9
W
6.9
6.9
6.9
6.9
7.0
7.0
7.1
7.2
7.4
13.9
13.9
13.7
15.0
16.3
17.0
SE
0.5
0.5
0.5
0.5
0.6
0.6
0.6
0.7
0.8
1.5
1.9
2.9
3.6
4.1
4.6
S
0.7
0.8
0.8
0.8
0.8
0.9
0.9
1.0
1.2
2.1
2.3
2.9
4.3
5.0
5.6
SW
1.4
1.5
1.5
1.6
1.6
1.7
1.7
1.8
2.0
2.6
3.1
9.4
16.3
19.5
18.4
W
3.8
3.9
3.9
4.0
4.0
4.0
4.2
4.4
4.6
10.4
11.4
18.8
21.6
22.4
25.1
Maximum wave height in a 3-hour sea state Hmax (m)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
7.0
7.8
8.6
9.4
10.1
10.9
11.5
11.9
12.5
13.7
14.7
18.8
21.6
22.4
25.1
N
7.0
7.8
8.6
9.4
9.7
9.8
9.8
9.8
9.7
11.1
11.6
12.1
12.6
12.0
12.7
NE
3.0
3.0
3.1
3.1
3.2
3.2
3.3
3.4
3.5
6.4
7.6
9.8
9.5
10.0
10.4
E
1.0
1.1
1.2
1.3
1.3
1.4
1.5
1.6
1.7
2.4
3.1
4.6
5.2
5.7
6.0
100-year
Period associated with max wave height - lower limit of Tmax (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
8.2
8.6
8.8
9.0
9.1
9.2
9.2
9.3
9.3
9.6
9.7
11.3
12.4
13.5
14.1
N
8.1
8.3
8.5
8.6
8.7
8.8
8.8
8.8
8.8
9.0
9.0
9.2
9.3
9.3
9.3
NE
5.4
5.3
5.3
5.3
5.3
5.3
5.3
5.2
5.2
8.0
8.0
8.3
8.3
8.3
8.3
E
2.4
2.5
2.6
2.7
2.8
2.9
2.9
3.1
3.3
4.2
4.7
5.5
5.9
6.2
6.3
NW
10.0
10.4
10.6
10.8
11.0
11.1
11.2
11.2
11.3
11.6
11.8
12.4
12.6
12.6
12.7
SE
1.7
1.8
1.8
1.8
1.9
1.9
1.9
2.1
2.3
2.8
3.2
4.2
4.7
5.1
5.4
NW
7.0
7.8
8.6
9.4
10.1
10.9
11.5
11.9
12.5
13.7
14.7
14.9
15.0
15.9
16.0
100-year
S
SW
W
NW
2.1
2.7
5.7
8.2
2.1
2.8
5.7
8.6
2.2
2.8
5.7
8.8
2.2
2.9
5.7
9.0
2.3
2.9
5.8
9.1
2.3
2.9
5.8
9.2
2.4
3.0
5.9
9.2
2.5
3.1
6.0
9.3
2.8
3.4
6.1
9.3
3.3
4.4
11.5
9.6
3.5
5.1
11.5
9.7
4.3
12.2
11.3
10.2
5.2
12.2
12.4
10.4
5.7
12.3
13.5
10.5
6.0
12.4
14.1
10.5
Prepared by Metoc plc 1 April 2009
SW Wave Hub Shore Export Cable - Metocean Design Basis
Table 2.1a Wave criteria - Return Period 100 years
I:\P1209_JPKenny\R2056 metocean\Table 2.1.xls T2.1a 09/04/2009 15:53
p 2 of 3
8 m Still water level above CD
0.78 H/d breaking limit
Period associated with max wave height - upper limit of Tmax (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
11.0
11.4
11.7
11.9
12.1
12.2
12.3
12.4
12.4
12.8
13.0
15.1
16.5
18.0
18.8
N
10.7
11.1
11.3
11.5
11.6
11.7
11.7
11.7
11.7
11.9
12.1
12.3
12.3
12.4
12.4
100-year
NE
7.2
7.1
7.1
7.1
7.1
7.0
7.0
7.0
7.0
10.7
10.7
11.0
11.1
11.1
11.1
E
3.2
3.4
3.5
3.6
3.7
3.9
3.9
4.2
4.4
5.6
6.3
7.4
7.9
8.3
8.4
SE
2.3
2.3
2.4
2.4
2.5
2.5
2.6
2.8
3.0
3.7
4.3
5.6
6.3
6.8
7.2
S
2.8
2.9
2.9
3.0
3.0
3.1
3.2
3.4
3.7
4.5
4.7
5.7
7.0
7.6
8.0
SW
3.6
3.7
3.8
3.8
3.9
3.9
4.0
4.2
4.6
5.9
6.8
16.3
16.3
16.4
16.5
NE
1.0
1.0
1.0
1.0
1.0
1.0
1.1
1.2
1.4
1.0
1.2
2.0
1.8
2.0
2.2
E
2.8
2.8
2.7
2.7
2.6
2.5
2.5
2.3
2.1
1.6
1.7
2.0
2.1
2.0
2.1
SE
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
3.2
3.0
2.3
2.4
2.4
2.3
S
SW
W
NW
2.2
3.4
1.1
1.8
2.2
3.4
1.1
1.7
2.2
3.4
1.1
1.7
2.2
3.4
1.2
1.7
2.2
3.4
1.2
1.7
2.2
3.4
1.2
1.7
2.2
3.3
1.2
1.7
2.2
3.2
1.2
1.8
2.2
2.6
1.3
2.0
3.1
1.5
1.0
2.2
3.1
1.1
1.0
2.5
2.3
1.0
2.2
2.0
2.2
1.0
2.1
1.9
2.2
1.6
1.5
2.2
2.2
1.4
1.6
2.2
Prepared by Metoc plc 1 April 2009
Spectral peakedness parameter gamma
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
1.8
1.7
1.7
1.7
1.7
1.7
1.7
1.8
2.0
2.2
2.5
2.2
2.1
1.5
1.6
N
1.7
1.6
1.6
1.6
1.5
1.5
1.5
1.4
1.4
1.8
2.0
2.0
2.2
1.9
2.1
W
7.6
7.6
7.6
7.6
7.7
7.7
7.8
8.0
8.2
15.3
15.3
15.1
16.5
18.0
18.8
NW
11.0
11.4
11.7
11.9
12.1
12.2
12.3
12.4
12.4
12.8
13.0
13.7
13.9
13.9
14.0
100-year
SW Wave Hub Shore Export Cable - Metocean Design Basis
Notes
Intended for use in engineering design of seabed cable
Extreme Hs and Tz are generated by wave refraction model MIKE21
The model calculates the transformation to shore of extreme waves input at its offshore boundary
Where more applicable, it calculates waves using principles of wind-generated wave growth
(whole route for sectors E, SE and S, and sheltered parts of route for sectors NE, SW and W)
Other wave parameters are derived from Hs and Tz using industry-standard relationships:
Tp = 1.27*Tz
Hmax is calculated from Hs and Tz for 3 hr storm duration according to Rayleigh theory; limited to 0.78 depth
Lower Tmax/Tz ratio 1.05; Upper Tmax/Tz ratio 1.40; Central Tmax is same as Tp
Gamma derived fron Hs, Tp using formulation given in offshore standard DNV-OS-J101
Wave boundary inputs calculated from European Wave Model at 50.7°N 5.7°W Nov 1988 - Nov 2008
European model data (joint frequency tables) purchased under licence from UK Met Office
Wind inputs calculated from Seven Stones Light Vessel observations 50°6'9"N 6°6'0"W Sep 2001 - Jan 2009
Table 2.1a Wave criteria - Return Period 100 years
I:\P1209_JPKenny\R2056 metocean\Table 2.1.xls T2.1a 09/04/2009 15:53
p 3 of 3
Hs (m) at KP 24.5
Hs (m) at KP 15
N
N
NW
NE
10
15
NE
10
5
W
N
15
15
NW
Hs (m) at KP 1.5
NW
5
0
E
SW
SE
W
5
E
0
SW
SE
S
W
E
0
SW
SE
S
8 m Still water level above CD
NE
10
S
0.78 H/d breaking limit
Extreme significant wave height, Hs (m)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
4.9
5.2
5.4
5.6
5.8
5.9
6.0
6.3
6.6
7.2
7.7
10.1
11.6
12.0
13.3
N
4.5
4.7
4.9
4.9
5.0
5.0
5.0
5.0
5.0
5.6
5.9
6.1
6.4
6.1
6.4
50-year
NE
1.5
1.5
1.5
1.6
1.6
1.6
1.6
1.7
1.7
3.2
3.9
4.9
4.8
5.1
5.2
E
0.5
0.5
0.6
0.6
0.6
0.7
0.7
0.8
0.8
1.2
1.5
2.3
2.6
2.8
3.0
SE
0.2
0.2
0.2
0.2
0.3
0.3
0.3
0.3
0.4
0.7
0.9
1.4
1.8
2.0
2.3
S
0.3
0.3
0.4
0.4
0.4
0.4
0.4
0.5
0.6
1.0
1.1
1.4
2.1
2.5
2.8
E
2.3
2.4
2.5
2.5
2.6
2.7
2.8
2.9
3.1
3.9
4.4
5.2
5.5
5.9
5.9
SE
1.6
1.6
1.7
1.7
1.7
1.8
1.8
1.9
2.1
2.7
3.1
3.9
4.4
4.8
5.1
S
SW
W
NW
2.0
2.6
5.3
7.8
2.0
2.6
5.4
8.2
2.0
2.7
5.4
8.4
2.1
2.7
5.4
8.5
2.1
2.7
5.4
8.6
2.1
2.8
5.4
8.7
2.2
2.8
5.5
8.7
2.4
2.9
5.6
8.8
2.6
3.2
5.8
8.8
3.1
4.2
10.9
9.1
3.3
4.8
10.9
9.2
4.0
11.5
10.8
9.6
4.9
11.5
11.7
9.7
5.4
11.6
12.7
9.7
5.7
11.6
13.2
9.8
Prepared by Metoc plc 1 April 2009
Mean zero-upcrossing wave period Tz (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
7.8
8.2
8.4
8.5
8.6
8.7
8.7
8.8
8.8
9.1
9.2
10.8
11.7
12.7
13.2
N
7.6
7.9
8.0
8.1
8.2
8.2
8.2
8.2
8.2
8.4
8.4
8.6
8.6
8.6
8.7
NE
5.1
5.0
5.0
5.0
5.0
5.0
5.0
4.9
4.9
7.5
7.5
7.7
7.7
7.7
7.8
SW
0.7
0.7
0.7
0.8
0.8
0.8
0.8
0.9
1.0
1.3
1.5
4.8
8.5
10.2
9.7
W
1.9
1.9
1.9
2.0
2.0
2.0
2.1
2.2
2.3
5.5
6.1
10.1
11.6
12.0
13.3
NW
4.9
5.2
5.4
5.6
5.8
5.9
6.0
6.3
6.6
7.2
7.7
7.7
7.7
8.2
8.2
50-year
SW Wave Hub Shore Export Cable - Metocean Design Basis
Table 2.1b Wave criteria - Return Period 50 years
I:\P1209_JPKenny\R2056 metocean\Table 2.1.xls T2.1b 09/04/2009 15:53
p 1 of 3
8 m Still water level above CD
0.78 H/d breaking limit
Period of peak spectral energy Tp (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
9.9
10.4
10.6
10.8
10.9
11.0
11.1
11.2
11.2
11.5
11.7
13.7
14.9
16.1
16.8
N
9.7
10.0
10.2
10.3
10.4
10.4
10.4
10.5
10.5
10.6
10.7
10.9
11.0
11.0
11.0
50-year
NE
6.4
6.4
6.4
6.4
6.3
6.3
6.3
6.3
6.2
9.6
9.5
9.8
9.8
9.8
9.8
E
2.9
3.0
3.1
3.2
3.3
3.4
3.5
3.7
3.9
5.0
5.6
6.6
7.0
7.4
7.5
SE
2.0
2.1
2.1
2.2
2.2
2.2
2.3
2.4
2.7
3.5
3.9
5.0
5.6
6.1
6.4
S
2.5
2.5
2.6
2.6
2.7
2.7
2.8
3.0
3.3
3.9
4.2
5.1
6.3
6.8
7.2
SW
3.3
3.3
3.4
3.4
3.5
3.5
3.6
3.7
4.1
5.3
6.1
14.5
14.6
14.7
14.7
W
6.8
6.8
6.8
6.9
6.9
6.9
7.0
7.1
7.3
13.8
13.9
13.7
14.9
16.1
16.8
SE
0.5
0.5
0.5
0.5
0.5
0.6
0.6
0.7
0.8
1.5
1.9
2.8
3.5
4.0
4.4
S
0.7
0.7
0.7
0.8
0.8
0.8
0.9
1.0
1.2
1.9
2.2
2.8
4.2
4.9
5.4
SW
1.4
1.5
1.5
1.5
1.6
1.6
1.7
1.8
1.9
2.6
3.0
9.0
15.7
18.8
17.9
W
3.7
3.7
3.8
3.8
3.9
3.9
4.1
4.2
4.5
10.2
11.2
18.7
21.5
22.0
24.3
Maximum wave height in a 3-hour sea state Hmax (m)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
7.0
7.8
8.6
9.4
10.1
10.9
11.4
11.8
12.4
13.5
14.5
18.7
21.5
22.0
24.3
N
7.0
7.8
8.6
9.4
9.5
9.5
9.5
9.5
9.4
10.7
11.2
11.5
12.0
11.5
12.1
NE
2.9
2.9
3.0
3.0
3.1
3.2
3.2
3.3
3.4
6.1
7.4
9.4
9.2
9.6
9.9
E
1.0
1.1
1.2
1.2
1.3
1.4
1.4
1.5
1.7
2.3
3.0
4.4
5.1
5.5
5.8
50-year
Period associated with max wave height - lower limit of Tmax (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
8.2
8.6
8.8
8.9
9.0
9.1
9.2
9.2
9.3
9.5
9.7
11.3
12.3
13.4
13.9
N
8.0
8.3
8.4
8.5
8.6
8.6
8.6
8.7
8.7
8.8
8.9
9.0
9.1
9.1
9.1
NE
5.3
5.3
5.3
5.3
5.2
5.2
5.2
5.2
5.2
7.9
7.9
8.1
8.1
8.1
8.1
E
2.4
2.5
2.6
2.7
2.7
2.9
2.9
3.1
3.3
4.1
4.6
5.5
5.8
6.1
6.2
NW
9.9
10.4
10.6
10.8
10.9
11.0
11.1
11.2
11.2
11.5
11.7
12.2
12.3
12.4
12.4
SE
1.7
1.7
1.7
1.8
1.8
1.8
1.9
2.0
2.2
2.9
3.2
4.1
4.7
5.0
5.3
NW
7.0
7.8
8.6
9.4
10.1
10.9
11.4
11.8
12.4
13.5
14.5
14.4
14.4
15.3
15.4
50-year
S
SW
W
NW
2.1
2.7
5.6
8.2
2.1
2.7
5.6
8.6
2.1
2.8
5.7
8.8
2.2
2.8
5.7
8.9
2.2
2.9
5.7
9.0
2.3
2.9
5.7
9.1
2.3
3.0
5.8
9.2
2.5
3.1
5.9
9.2
2.7
3.4
6.0
9.3
3.2
4.4
11.4
9.5
3.5
5.1
11.5
9.7
4.2
12.0
11.3
10.1
5.2
12.1
12.3
10.2
5.6
12.1
13.4
10.2
5.9
12.2
13.9
10.3
Prepared by Metoc plc 1 April 2009
SW Wave Hub Shore Export Cable - Metocean Design Basis
Table 2.1b Wave criteria - Return Period 50 years
I:\P1209_JPKenny\R2056 metocean\Table 2.1.xls T2.1b 09/04/2009 15:53
p 2 of 3
8 m Still water level above CD
0.78 H/d breaking limit
Period associated with max wave height - upper limit of Tmax (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
11.0
11.4
11.7
11.9
12.1
12.1
12.2
12.3
12.4
12.7
12.9
15.1
16.4
17.8
18.5
N
10.7
11.0
11.2
11.3
11.4
11.5
11.5
11.5
11.5
11.7
11.8
12.0
12.1
12.1
12.1
50-year
NE
7.1
7.1
7.0
7.0
7.0
7.0
7.0
6.9
6.9
10.5
10.5
10.8
10.8
10.8
10.9
E
3.2
3.3
3.4
3.6
3.6
3.8
3.9
4.1
4.3
5.5
6.2
7.3
7.8
8.2
8.3
SE
2.2
2.3
2.3
2.4
2.4
2.5
2.5
2.7
2.9
3.8
4.3
5.5
6.2
6.7
7.1
S
2.7
2.8
2.9
2.9
3.0
3.0
3.1
3.3
3.6
4.3
4.6
5.6
6.9
7.5
7.9
SW
3.6
3.7
3.7
3.8
3.8
3.9
4.0
4.1
4.5
5.8
6.7
16.0
16.1
16.2
16.2
W
7.5
7.5
7.5
7.6
7.6
7.6
7.7
7.8
8.1
15.3
15.3
15.1
16.4
17.8
18.5
NE
1.0
1.0
1.0
1.0
1.0
1.0
1.1
1.2
1.4
1.0
1.2
2.0
1.8
2.1
2.2
E
2.8
2.8
2.7
2.7
2.6
2.5
2.5
2.3
2.1
1.6
1.6
2.0
2.1
2.0
2.1
SE
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
3.1
3.0
2.5
2.4
2.4
2.3
S
SW
W
NW
2.2
3.5
1.1
1.8
2.2
3.4
1.1
1.7
2.2
3.4
1.1
1.7
2.2
3.4
1.1
1.7
2.2
3.4
1.2
1.7
2.2
3.4
1.2
1.7
2.2
3.4
1.2
1.7
2.2
3.2
1.2
1.9
2.2
2.6
1.3
2.0
3.2
1.5
1.0
2.2
3.1
1.1
1.0
2.5
2.3
1.0
2.2
2.0
2.2
1.0
2.1
1.9
2.2
1.6
1.5
2.2
2.2
1.4
1.6
2.2
Prepared by Metoc plc 1 April 2009
Spectral peakedness parameter gamma
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
1.8
1.7
1.7
1.7
1.7
1.7
1.7
1.9
2.0
2.2
2.5
2.2
2.1
1.5
1.6
N
1.7
1.6
1.6
1.5
1.5
1.5
1.5
1.4
1.4
1.8
2.0
2.0
2.1
1.9
2.1
NW
11.0
11.4
11.7
11.9
12.1
12.1
12.2
12.3
12.4
12.7
12.9
13.4
13.6
13.6
13.7
50-year
SW Wave Hub Shore Export Cable - Metocean Design Basis
Notes
Intended for use in engineering design of seabed cable
Extreme Hs and Tz are generated by wave refraction model MIKE21
The model calculates the transformation to shore of extreme waves input at its offshore boundary
Where more applicable, it calculates waves using principles of wind-generated wave growth
(whole route for sectors E, SE and S, and sheltered parts of route for sectors NE, SW and W)
Other wave parameters are derived from Hs and Tz using industry-standard relationships:
Tp = 1.27*Tz
Hmax is calculated from Hs and Tz for 3 hr storm duration according to Rayleigh theory; limited to 0.78 depth
Lower Tmax/Tz ratio 1.05; Upper Tmax/Tz ratio 1.40; Central Tmax is same as Tp
Gamma derived fron Hs, Tp using formulation given in offshore standard DNV-OS-J101
Wave boundary inputs calculated from European Wave Model at 50.7°N 5.7°W Nov 1988 - Nov 2008
European model data (joint frequency tables) purchased under licence from UK Met Office
Wind inputs calculated from Seven Stones Light Vessel observations 50°6'9"N 6°6'0"W Sep 2001 - Jan 2009
Table 2.1b Wave criteria - Return Period 50 years
I:\P1209_JPKenny\R2056 metocean\Table 2.1.xls T2.1b 09/04/2009 15:53
p 3 of 3
Hs (m) at KP 24.5
Hs (m) at KP 15
N
N
NW
NE
10
15
NE
10
5
W
N
15
15
NW
Hs (m) at KP 1.5
NW
5
0
E
SW
SE
W
5
E
0
SW
SE
S
W
E
0
SW
SE
S
8 m Still water level above CD
NE
10
S
0.78 H/d breaking limit
Extreme significant wave height, Hs (m)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
4.8
5.1
5.3
5.4
5.6
5.7
5.8
6.0
6.3
6.8
7.2
10.0
11.3
11.2
12.2
N
4.3
4.4
4.5
4.5
4.6
4.6
4.6
4.5
4.5
5.1
5.3
5.4
5.6
5.5
5.7
10-year
NE
1.4
1.4
1.4
1.5
1.5
1.5
1.5
1.6
1.6
2.8
3.5
4.4
4.4
4.5
4.6
E
0.5
0.5
0.5
0.6
0.6
0.6
0.6
0.7
0.7
1.1
1.4
2.1
2.4
2.6
2.8
SE
0.2
0.2
0.2
0.2
0.2
0.2
0.3
0.3
0.3
0.7
0.9
1.3
1.7
1.9
2.1
S
0.3
0.3
0.3
0.3
0.3
0.4
0.4
0.4
0.5
0.9
1.0
1.3
2.0
2.4
2.6
E
2.2
2.3
2.4
2.4
2.5
2.6
2.6
2.8
2.9
3.8
4.3
5.0
5.4
5.7
5.7
SE
1.5
1.5
1.6
1.6
1.6
1.7
1.7
1.8
2.0
2.7
3.0
3.8
4.3
4.6
4.9
S
SW
W
NW
1.9
2.5
5.1
7.8
1.9
2.5
5.2
8.1
1.9
2.5
5.2
8.3
2.0
2.6
5.2
8.4
2.0
2.6
5.2
8.5
2.0
2.7
5.2
8.5
2.1
2.7
5.3
8.6
2.2
2.8
5.4
8.6
2.4
3.1
5.6
8.6
2.9
4.1
10.8
8.8
3.1
4.7
10.8
8.9
3.9
11.0
10.7
9.1
4.8
11.0
11.6
9.2
5.2
11.1
12.3
9.2
5.5
11.1
12.6
9.2
Prepared by Metoc plc 1 April 2009
Mean zero-upcrossing wave period Tz (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
7.8
8.1
8.3
8.4
8.5
8.5
8.6
8.6
8.6
8.8
8.9
10.7
11.6
12.3
12.6
N
7.5
7.6
7.7
7.8
7.8
7.8
7.8
7.8
7.8
7.9
8.0
8.1
8.1
8.1
8.2
NE
4.9
4.9
4.9
4.9
4.8
4.8
4.8
4.8
4.7
7.2
7.1
7.3
7.3
7.3
7.3
SW
0.6
0.7
0.7
0.7
0.7
0.7
0.8
0.8
0.9
1.3
1.5
4.3
7.7
9.2
9.0
W
1.7
1.8
1.8
1.8
1.8
1.9
1.9
2.0
2.2
5.3
5.8
10.0
11.3
11.2
12.2
NW
4.8
5.1
5.3
5.4
5.6
5.7
5.8
6.0
6.3
6.8
7.2
6.9
6.9
7.3
7.3
10-year
SW Wave Hub Shore Export Cable - Metocean Design Basis
Table 2.1c Wave criteria - Return Period 10 years
I:\P1209_JPKenny\R2056 metocean\Table 2.1.xls T2.1c 09/04/2009 15:53
p 1 of 3
8 m Still water level above CD
0.78 H/d breaking limit
Period of peak spectral energy Tp (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
9.9
10.3
10.5
10.6
10.8
10.8
10.9
10.9
11.0
11.2
11.3
13.6
14.7
15.6
16.0
N
9.5
9.7
9.8
9.9
9.9
10.0
10.0
10.0
10.0
10.1
10.2
10.3
10.3
10.4
10.4
10-year
NE
6.2
6.2
6.2
6.2
6.1
6.1
6.1
6.1
6.0
9.1
9.1
9.2
9.3
9.3
9.3
E
2.8
2.9
3.0
3.1
3.2
3.3
3.3
3.5
3.7
4.9
5.5
6.4
6.8
7.2
7.3
SE
1.9
2.0
2.0
2.0
2.1
2.1
2.2
2.3
2.5
3.4
3.8
4.8
5.5
5.9
6.2
S
2.4
2.4
2.4
2.5
2.5
2.6
2.7
2.8
3.1
3.7
4.0
4.9
6.1
6.6
7.0
SW
3.1
3.2
3.2
3.3
3.3
3.4
3.5
3.6
3.9
5.2
6.0
14.0
14.0
14.1
14.1
W
6.5
6.5
6.6
6.6
6.6
6.7
6.8
6.9
7.1
13.7
13.7
13.6
14.7
15.6
16.0
SE
0.4
0.4
0.5
0.5
0.5
0.5
0.5
0.6
0.7
1.5
1.8
2.6
3.3
3.7
4.1
S
0.6
0.6
0.7
0.7
0.7
0.7
0.8
0.9
1.0
1.8
2.0
2.6
3.9
4.6
5.1
SW
1.3
1.4
1.4
1.4
1.5
1.5
1.6
1.7
1.8
2.5
2.9
7.9
14.3
17.1
16.6
W
3.4
3.5
3.5
3.6
3.6
3.6
3.8
3.9
4.2
9.8
10.9
18.6
20.9
20.6
22.3
Maximum wave height in a 3-hour sea state Hmax (m)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
7.0
7.8
8.6
9.4
10.1
10.7
11.0
11.4
11.9
12.8
13.6
18.6
20.9
20.6
22.3
N
7.0
7.8
8.6
8.6
8.7
8.7
8.7
8.6
8.6
9.7
10.1
10.3
10.7
10.4
10.9
NE
2.7
2.8
2.8
2.8
2.9
3.0
3.0
3.1
3.2
5.4
6.8
8.4
8.4
8.7
8.8
E
1.0
1.0
1.1
1.1
1.2
1.3
1.3
1.4
1.5
2.2
2.8
4.1
4.7
5.1
5.4
10-year
Period associated with max wave height - lower limit of Tmax (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
8.2
8.5
8.7
8.8
8.9
9.0
9.0
9.0
9.1
9.3
9.3
11.2
12.2
12.9
13.2
N
7.8
8.0
8.1
8.2
8.2
8.2
8.2
8.2
8.2
8.3
8.4
8.5
8.5
8.6
8.6
NE
5.2
5.1
5.1
5.1
5.1
5.1
5.1
5.0
5.0
7.5
7.5
7.6
7.6
7.7
7.7
E
2.3
2.4
2.5
2.6
2.6
2.7
2.8
2.9
3.1
4.0
4.5
5.3
5.6
5.9
6.0
NW
9.9
10.3
10.5
10.6
10.8
10.8
10.9
10.9
11.0
11.2
11.3
11.6
11.7
11.7
11.7
SE
1.6
1.6
1.7
1.7
1.7
1.7
1.8
1.9
2.1
2.8
3.2
4.0
4.5
4.9
5.1
NW
7.0
7.8
8.6
9.4
10.1
10.7
11.0
11.4
11.9
12.8
13.6
12.9
12.9
13.7
13.8
10-year
S
SW
W
NW
1.9
2.6
5.4
8.2
2.0
2.6
5.4
8.5
2.0
2.7
5.4
8.7
2.1
2.7
5.5
8.8
2.1
2.8
5.5
8.9
2.1
2.8
5.5
9.0
2.2
2.9
5.6
9.0
2.3
3.0
5.7
9.0
2.6
3.3
5.8
9.1
3.1
4.3
11.3
9.3
3.3
4.9
11.3
9.3
4.1
11.6
11.2
9.6
5.0
11.6
12.2
9.6
5.5
11.6
12.9
9.7
5.8
11.7
13.2
9.7
Prepared by Metoc plc 1 April 2009
SW Wave Hub Shore Export Cable - Metocean Design Basis
Table 2.1c Wave criteria - Return Period 10 years
I:\P1209_JPKenny\R2056 metocean\Table 2.1.xls T2.1c 09/04/2009 15:53
p 2 of 3
8 m Still water level above CD
0.78 H/d breaking limit
Period associated with max wave height - upper limit of Tmax (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
10.9
11.3
11.6
11.7
11.9
11.9
12.0
12.1
12.1
12.3
12.4
15.0
16.2
17.2
17.6
N
10.5
10.7
10.8
10.9
10.9
11.0
11.0
11.0
11.0
11.1
11.2
11.3
11.4
11.4
11.4
10-year
NE
6.9
6.9
6.8
6.8
6.8
6.8
6.8
6.7
6.6
10.0
10.0
10.2
10.2
10.2
10.2
E
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.9
4.1
5.4
6.0
7.0
7.5
7.9
8.0
SE
2.1
2.2
2.2
2.2
2.3
2.3
2.4
2.5
2.8
3.7
4.2
5.3
6.0
6.5
6.9
S
2.6
2.6
2.7
2.7
2.8
2.8
2.9
3.1
3.4
4.1
4.4
5.4
6.7
7.3
7.7
SW
3.4
3.5
3.6
3.6
3.7
3.7
3.8
3.9
4.3
5.7
6.6
15.4
15.4
15.5
15.6
W
7.2
7.2
7.2
7.3
7.3
7.3
7.5
7.6
7.8
15.1
15.1
15.0
16.2
17.2
17.6
NE
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.2
1.4
1.0
1.2
2.0
2.0
2.1
2.2
E
2.7
2.7
2.6
2.6
2.6
2.5
2.5
2.3
2.1
1.5
1.6
2.0
2.1
2.0
2.1
SE
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
3.1
3.0
2.5
2.4
2.3
2.3
S
SW
W
NW
2.2
3.5
1.1
1.8
2.2
3.5
1.1
1.7
2.2
3.5
1.1
1.7
2.2
3.5
1.1
1.7
2.2
3.5
1.1
1.7
2.2
3.4
1.2
1.7
2.2
3.4
1.2
1.7
2.2
3.3
1.2
1.9
2.2
2.6
1.2
2.1
3.1
1.5
1.0
2.2
3.1
1.1
1.0
2.5
2.3
1.0
2.3
2.0
2.2
1.0
2.1
1.9
2.2
1.5
1.5
2.1
2.2
1.4
1.6
2.2
Prepared by Metoc plc 1 April 2009
Spectral peakedness parameter gamma
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
1.8
1.7
1.7
1.7
1.7
1.7
1.7
1.9
2.1
2.2
2.5
2.3
2.1
1.5
1.6
N
1.6
1.6
1.5
1.5
1.5
1.5
1.5
1.4
1.4
1.9
2.0
2.0
2.1
2.0
2.2
NW
10.9
11.3
11.6
11.7
11.9
11.9
12.0
12.1
12.1
12.3
12.4
12.7
12.8
12.9
12.9
10-year
SW Wave Hub Shore Export Cable - Metocean Design Basis
Notes
Intended for use in engineering design of seabed cable
Extreme Hs and Tz are generated by wave refraction model MIKE21
The model calculates the transformation to shore of extreme waves input at its offshore boundary
Where more applicable, it calculates waves using principles of wind-generated wave growth
(whole route for sectors E, SE and S, and sheltered parts of route for sectors NE, SW and W)
Other wave parameters are derived from Hs and Tz using industry-standard relationships:
Tp = 1.27*Tz
Hmax is calculated from Hs and Tz for 3 hr storm duration according to Rayleigh theory; limited to 0.78 depth
Lower Tmax/Tz ratio 1.05; Upper Tmax/Tz ratio 1.40; Central Tmax is same as Tp
Gamma derived fron Hs, Tp using formulation given in offshore standard DNV-OS-J101
Wave boundary inputs calculated from European Wave Model at 50.7°N 5.7°W Nov 1988 - Nov 2008
European model data (joint frequency tables) purchased under licence from UK Met Office
Wind inputs calculated from Seven Stones Light Vessel observations 50°6'9"N 6°6'0"W Sep 2001 - Jan 2009
Table 2.1c Wave criteria - Return Period 10 years
I:\P1209_JPKenny\R2056 metocean\Table 2.1.xls T2.1c 09/04/2009 15:53
p 3 of 3
Hs (m) at KP 24.5
Hs (m) at KP 15
N
N
NW
NE
10
15
NE
10
NW
5
5
W
N
15
15
NW
Hs (m) at KP 1.5
0
E
SW
SE
W
5
E
0
SW
SE
S
W
E
0
SW
SE
S
8 m Still water level above CD
NE
10
S
0.78 H/d breaking limit
Extreme significant wave height, Hs (m)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
4.5
4.7
4.8
4.8
4.9
4.9
5.1
5.2
5.5
5.8
6.0
9.7
10.4
9.5
10.2
N
3.7
3.8
3.8
3.8
3.8
3.8
3.8
3.8
3.8
4.2
4.4
4.4
4.6
4.5
4.6
1-year
NE
1.2
1.2
1.2
1.2
1.2
1.3
1.3
1.4
1.4
2.3
3.0
3.6
3.6
3.7
3.7
E
0.4
0.4
0.4
0.5
0.5
0.5
0.5
0.6
0.6
1.0
1.3
1.9
2.1
2.3
2.4
SE
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.3
0.6
0.7
1.1
1.4
1.7
1.8
S
0.2
0.2
0.3
0.3
0.3
0.3
0.3
0.3
0.4
0.8
0.9
1.2
1.8
2.1
2.3
E
2.1
2.1
2.2
2.2
2.3
2.4
2.4
2.5
2.7
3.7
4.1
4.7
5.0
5.3
5.4
SE
1.4
1.4
1.4
1.4
1.5
1.5
1.5
1.6
1.8
2.4
2.8
3.6
4.0
4.4
4.6
S
SW
W
NW
1.7
2.3
4.8
7.6
1.7
2.3
4.8
7.8
1.7
2.4
4.9
7.9
1.8
2.4
4.9
8.0
1.8
2.4
4.9
8.0
1.8
2.5
4.9
8.0
1.9
2.5
5.0
8.1
2.0
2.6
5.1
8.1
2.2
2.9
5.2
8.1
2.9
3.9
10.5
8.1
3.1
4.6
10.5
8.2
3.7
10.2
10.5
8.2
4.6
10.2
11.1
8.3
5.0
10.3
11.4
8.3
5.2
10.3
11.5
8.3
Prepared by Metoc plc 1 April 2009
Mean zero-upcrossing wave period Tz (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
7.6
7.8
7.9
8.0
8.0
8.0
8.1
8.1
8.1
8.1
8.2
10.5
11.1
11.4
11.5
N
7.0
7.1
7.1
7.1
7.1
7.1
7.1
7.1
7.1
7.2
7.2
7.3
7.3
7.3
7.3
NE
4.4
4.4
4.4
4.3
4.3
4.3
4.3
4.3
4.2
6.5
6.5
6.5
6.5
6.5
6.5
SW
0.5
0.6
0.6
0.6
0.6
0.6
0.7
0.7
0.8
1.1
1.3
3.4
6.4
7.5
7.7
W
1.5
1.6
1.6
1.6
1.6
1.6
1.7
1.8
1.9
4.9
5.4
9.7
10.4
9.5
10.2
NW
4.5
4.7
4.8
4.8
4.9
4.9
5.1
5.2
5.5
5.8
6.0
5.6
5.6
5.9
5.9
1-year
SW Wave Hub Shore Export Cable - Metocean Design Basis
Table 2.1d Wave criteria - Return Period 1 year
I:\P1209_JPKenny\R2056 metocean\Table 2.1.xls T2.1d 09/04/2009 15:53
p 1 of 3
8 m Still water level above CD
0.78 H/d breaking limit
Period of peak spectral energy Tp (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
9.7
9.9
10.1
10.1
10.2
10.2
10.2
10.2
10.3
10.3
10.4
13.3
14.1
14.5
14.7
N
8.9
9.0
9.0
9.0
9.1
9.1
9.1
9.1
9.1
9.1
9.2
9.3
9.3
9.3
9.3
1-year
NE
5.6
5.6
5.5
5.5
5.5
5.5
5.5
5.4
5.4
8.2
8.2
8.3
8.3
8.3
8.3
E
2.7
2.7
2.8
2.8
2.9
3.0
3.0
3.2
3.4
4.7
5.2
6.0
6.4
6.8
6.8
SE
1.7
1.8
1.8
1.8
1.9
1.9
2.0
2.1
2.3
3.1
3.5
4.5
5.1
5.5
5.8
S
2.1
2.2
2.2
2.2
2.3
2.3
2.4
2.5
2.8
3.6
3.9
4.7
5.8
6.3
6.6
SW
2.9
2.9
3.0
3.0
3.1
3.1
3.2
3.3
3.6
5.0
5.8
12.9
13.0
13.0
13.1
W
6.1
6.2
6.2
6.2
6.2
6.3
6.4
6.5
6.6
13.4
13.4
13.3
14.1
14.5
14.7
SE
0.3
0.4
0.4
0.4
0.4
0.4
0.4
0.5
0.6
1.2
1.5
2.3
2.9
3.3
3.6
S
0.5
0.5
0.5
0.6
0.6
0.6
0.6
0.7
0.9
1.6
1.9
2.4
3.5
4.2
4.6
SW
1.1
1.2
1.2
1.2
1.3
1.3
1.4
1.4
1.6
2.2
2.6
6.3
11.9
14.1
14.4
W
3.0
3.1
3.1
3.1
3.2
3.2
3.4
3.5
3.7
9.1
10.1
18.0
19.3
17.7
18.9
Maximum wave height in a 3-hour sea state Hmax (m)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
7.0
7.8
8.6
9.2
9.3
9.4
9.6
9.9
10.4
10.9
11.5
18.0
19.3
17.7
18.9
N
7.0
7.2
7.2
7.2
7.2
7.2
7.2
7.2
7.3
8.1
8.5
8.5
8.7
8.6
8.8
NE
2.3
2.3
2.4
2.4
2.5
2.5
2.5
2.7
2.8
4.5
5.7
7.0
7.0
7.0
7.1
E
0.8
0.9
0.9
0.9
1.0
1.0
1.1
1.2
1.3
2.0
2.5
3.7
4.2
4.5
4.8
1-year
Period associated with max wave height - lower limit of Tmax (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
8.0
8.2
8.3
8.4
8.4
8.4
8.5
8.5
8.5
8.6
8.6
11.0
11.7
12.0
12.1
N
7.4
7.4
7.5
7.5
7.5
7.5
7.5
7.5
7.5
7.6
7.6
7.7
7.7
7.7
7.7
NE
4.6
4.6
4.6
4.6
4.5
4.5
4.5
4.5
4.5
6.8
6.8
6.8
6.8
6.8
6.8
E
2.2
2.2
2.3
2.3
2.4
2.5
2.5
2.6
2.8
3.9
4.3
5.0
5.3
5.6
5.7
NW
9.7
9.9
10.1
10.1
10.2
10.2
10.2
10.2
10.3
10.3
10.4
10.5
10.5
10.5
10.5
SE
1.4
1.5
1.5
1.5
1.5
1.6
1.6
1.7
1.9
2.6
2.9
3.7
4.2
4.6
4.8
NW
7.0
7.8
8.6
9.2
9.3
9.4
9.6
9.9
10.4
10.9
11.5
10.6
10.7
11.1
11.2
1-year
S
SW
W
NW
1.7
2.4
5.1
8.0
1.8
2.4
5.1
8.2
1.8
2.5
5.1
8.3
1.8
2.5
5.1
8.4
1.9
2.5
5.2
8.4
1.9
2.6
5.2
8.4
2.0
2.6
5.3
8.5
2.1
2.7
5.4
8.5
2.3
3.0
5.5
8.5
3.0
4.1
11.1
8.6
3.2
4.8
11.1
8.6
3.9
10.7
11.0
8.6
4.8
10.7
11.7
8.7
5.2
10.8
12.0
8.7
5.5
10.8
12.1
8.7
Prepared by Metoc plc 1 April 2009
SW Wave Hub Shore Export Cable - Metocean Design Basis
Table 2.1d Wave criteria - Return Period 1 year
I:\P1209_JPKenny\R2056 metocean\Table 2.1.xls T2.1d 09/04/2009 15:53
p 2 of 3
8 m Still water level above CD
0.78 H/d breaking limit
Period associated with max wave height - upper limit of Tmax (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
10.7
11.0
11.1
11.2
11.2
11.2
11.3
11.3
11.3
11.4
11.4
14.7
15.6
16.0
16.2
N
9.8
9.9
10.0
10.0
10.0
10.0
10.0
10.0
10.0
10.1
10.1
10.2
10.2
10.2
10.2
1-year
NE
6.1
6.1
6.1
6.1
6.1
6.0
6.0
6.0
5.9
9.0
9.0
9.1
9.1
9.1
9.1
E
2.9
3.0
3.1
3.1
3.2
3.3
3.4
3.5
3.8
5.1
5.7
6.6
7.1
7.5
7.5
SE
1.9
1.9
2.0
2.0
2.0
2.1
2.2
2.3
2.5
3.4
3.9
5.0
5.7
6.1
6.4
S
2.3
2.4
2.4
2.5
2.5
2.6
2.6
2.8
3.1
4.0
4.3
5.2
6.4
6.9
7.3
SW
3.2
3.2
3.3
3.3
3.4
3.4
3.5
3.6
4.0
5.5
6.4
14.3
14.3
14.4
14.4
W
6.7
6.8
6.8
6.9
6.9
6.9
7.0
7.1
7.3
14.7
14.8
14.7
15.6
16.0
16.2
NE
1.0
1.0
1.0
1.0
1.1
1.1
1.2
1.5
1.8
1.0
1.3
2.1
2.1
2.2
2.2
E
2.5
2.6
2.6
2.6
2.5
2.5
2.5
2.4
2.2
1.5
1.6
1.9
2.0
1.9
2.0
SE
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
3.1
2.8
2.4
2.3
2.3
2.2
S
SW
W
NW
2.2
3.6
1.1
1.6
2.2
3.6
1.1
1.6
2.2
3.5
1.1
1.6
2.2
3.5
1.1
1.6
2.2
3.5
1.1
1.6
2.2
3.5
1.1
1.6
2.2
3.5
1.1
1.7
2.2
3.3
1.2
1.8
2.2
2.6
1.2
2.0
3.0
1.4
1.0
2.2
2.9
1.0
1.0
2.5
2.2
1.0
2.3
1.9
2.2
1.0
2.1
1.9
2.2
1.3
1.4
2.1
2.2
1.4
1.6
2.2
Prepared by Metoc plc 1 April 2009
Spectral peakedness parameter gamma
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
1.6
1.6
1.6
1.6
1.6
1.6
1.7
1.8
2.0
2.2
2.5
2.3
2.1
1.4
1.6
N
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.9
2.1
2.0
2.1
2.1
2.2
NW
10.7
11.0
11.1
11.2
11.2
11.2
11.3
11.3
11.3
11.4
11.4
11.5
11.6
11.6
11.6
1-year
SW Wave Hub Shore Export Cable - Metocean Design Basis
Notes
Intended for use in engineering design of seabed cable
Extreme Hs and Tz are generated by wave refraction model MIKE21
The model calculates the transformation to shore of extreme waves input at its offshore boundary
For waves moving offshore (e.g. from east) it calculates wind-generated wave growth
Other wave parameters are derived from Hs and Tz using industry-standard relationships:
Tp = 1.27*Tz
Hmax is calculated from Hs and Tz for 3 hr storm duration according to Rayleigh theory; limited to 0.78 depth
Lower Tmax/Tz ratio 1.05; Upper Tmax/Tz ratio 1.40; Central Tmax is same as Tp
Gamma derived fron Hs, Tp using formulation given in offshore standard DNV-OS-J101
Wave boundary inputs calculated from European Wave Model at 50.7°N 5.7°W Nov 1988 - Nov 2008
European model data (joint frequency tables) purchased under licence from UK Met Office
Wind inputs calculated from Seven Stones Light Vessel observations 50°6'9"N 6°6'0"W Sep 2001 - Jan 2009
Table 2.1d Wave criteria - Return Period 1 year
I:\P1209_JPKenny\R2056 metocean\Table 2.1.xls T2.1d 09/04/2009 15:53
p 3 of 3
Winter (Oct-Mar)
KP
km
1.25
1.3
1.35
1.4
1.45
1.5
1.6
1.8
2.15
3.45
4.15
10
15
20
24.5
Depth (m)
LAT
100yr
1
9
2
10
3
11
4
12
5
13
6
14
8
16
10
18
12
20
15
23
20
28
22
30
28
36
33
41
52
60
NonDir
131
118
108
99
92
86
76
68
62
54
46
43
37
33
25
KP
km
1.25
1.3
1.35
1.4
1.45
1.5
1.6
1.8
2.15
3.45
4.15
10
15
20
24.5
Depth (m)
LAT
100yr
1
9
2
10
3
11
4
12
5
13
6
14
8
16
10
18
12
20
15
23
20
28
22
30
28
36
33
41
52
60
NonDir
77
70
64
59
54
51
45
40
37
33
28
26
23
21
16
N
37
33
31
28
27
25
22
20
19
17
15
14
12
12
10
NE
32
29
27
25
23
22
20
18
17
15
13
13
12
11
10
E
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
Wave Direction (from)
SE
S
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
E
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
Wave Direction (from)
SE
S
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
SW
10
10
10
10
10
80
70
63
58
51
43
41
35
32
25
W
131
118
108
99
92
86
76
68
62
54
46
43
37
33
25
NW
63
57
53
49
45
42
38
34
31
28
24
23
20
18
15
Summer (Apr-Sep)
N
28
26
24
22
21
20
18
16
15
14
12
12
11
11
10
NE
23
22
20
19
18
17
15
14
13
12
11
11
11
10
10
Winter
140
120
N
100
60
W
77
70
64
59
54
51
45
40
37
33
28
26
23
21
16
NW
40
37
34
31
29
27
25
22
21
19
16
16
14
13
12
Summer
140
80
SW
10
10
10
10
10
46
41
37
34
30
26
25
22
20
16
NE
N
120
NE
100
E
E
80
SE
SE
60
S
40
S
40
SW
20
SW
W
0
0
20
40
Still water depth, m
60
NW
W
20
NW
0
0
20
40
Still water depth, m
Wave spreading parameter, s, is calculated according to method given in DNV-RP-F105
E, SE and S coincide and therefore appear as one line
Table 2.1e Wave spreading parameter for use with design waves
60
UK Waters Model at 50.4°N 5.6°W Mar 2000 - Nov 2008
Significant Wave Height is the resultant of sea and swell.
Data acquired under licence from UK Met Office
Hs (m)
0.0 TO 0.5
0.6 TO 1.0
1.1 TO 1.5
1.6 TO 2.0
2.1 TO 2.5
2.6 TO 3.0
3.1 TO 3.5
3.6 TO 4.0
4.1 TO 4.5
4.6 TO 5.0
5.1 TO 5.5
5.6 TO 6.0
6.1 TO 6.5
6.6 TO 7.0
7.1 TO 7.5
7.6 TO 8.0
8.1 TO 8.5
8.6 TO 9.0
9.1 TO 9.5
9.6 TO 10.0
10.1 TO 10.5
10.6 TO 11.0
11.1 TO 11.5
11.6 TO 12.0
12.1 TO 12.5
12.6 OR MORE
Total
Table 2.4a
Jan
14
136
231
259
284
259
187
185
175
106
68
32
12
1
Feb
22
283
317
252
201
171
139
132
110
74
40
20
10
3
Mar
26
282
395
283
333
257
140
92
54
63
35
10
5
2
1
1
1
3
Apr
94
449
532
410
295
185
105
50
26
6
4
1
2
May
91
633
552
326
241
144
132
38
25
7
9
1
Jun
148
619
646
404
202
75
34
18
4
2
4
Jul
137
774
572
303
230
104
66
35
9
Aug
73
725
629
438
182
98
44
14
5
3
4
1
Sep
89
679
525
305
225
148
104
54
24
2
3
Oct
39
298
498
367
319
239
201
127
60
27
23
11
10
1
4
Nov
16
273
333
333
255
195
187
124
76
40
24
16
2
1
4
1,949
1,774
1,983
2,159
2,199
2,156
2,230
2,216
2,158
2,224
1,879
Significant Wave Height at Wave Hub - Number Occurrence
I:\P1209_JPKenny\R2056 metocean\Table 2.4.xls T2.4 09/04/2009
Numbers Occurrence
Dec
Year
10
759
236
5,387
385
5,615
347
4,027
251
3,018
195
2,070
152
1,491
145
1,014
86
654
58
388
42
256
21
113
18
59
13
21
6
15
2
3
3
4
1
4
1,971
24,898
UK Waters Model at 50.4°N 5.6°W Mar 2000 - Nov 2008
Significant Wave Height is the resultant of sea and swell.
Data acquired under licence from UK Met Office
Hs (m)
> 0.5
> 1.0
> 1.5
> 2.0
> 2.5
> 3.0
> 3.5
> 4.0
> 4.5
> 5.0
> 5.5
> 6.0
> 6.5
> 7.0
> 7.5
> 8.0
> 8.5
> 9.0
> 9.5
> 10.0
> 10.5
> 11.0
> 11.5
> 12.0
> 12.5
Table 2.4b
Jan
99.28
92.30
80.45
67.16
52.59
39.30
29.71
20.22
11.24
5.80
2.31
0.67
0.05
-
Feb
98.76
82.81
64.94
50.73
39.40
29.76
21.93
14.49
8.29
4.11
1.86
0.73
0.17
-
Mar
98.69
84.47
64.55
50.28
33.48
20.52
13.46
8.83
6.10
2.92
1.16
0.66
0.40
0.30
0.25
0.20
0.15
-
Apr
95.65
74.85
50.21
31.22
17.55
8.99
4.12
1.81
0.60
0.32
0.14
0.09
-
May
95.86
67.08
41.97
27.15
16.19
9.64
3.64
1.91
0.77
0.45
0.05
-
Jun
93.14
64.42
34.46
15.72
6.35
2.88
1.30
0.46
0.28
0.19
-
Jul
93.86
59.15
33.50
19.91
9.60
4.93
1.97
0.40
-
Significant Wave Height at Wave Hub - Percent Exceedence
I:\P1209_JPKenny\R2056 metocean\Table 2.4.xls T2.4 09/04/2009
Aug
96.71
63.99
35.60
15.84
7.63
3.20
1.22
0.59
0.36
0.23
0.05
-
Sep
95.88
64.41
40.08
25.95
15.52
8.67
3.85
1.34
0.23
0.14
-
Oct
98.25
84.85
62.46
45.95
31.61
20.86
11.83
6.12
3.42
2.20
1.17
0.67
0.22
0.18
-
Nov
99.15
84.62
66.90
49.18
35.60
25.23
15.27
8.67
4.63
2.50
1.22
0.37
0.27
0.21
-
Percent Exceedence
Dec
Year
99.49
96.95
87.52
75.32
67.99
52.76
50.38
36.59
37.65
24.47
27.75
16.15
20.04
10.17
12.68
6.09
8.32
3.47
5.38
1.91
3.25
0.88
2.18
0.43
1.27
0.19
0.61
0.10
0.30
0.04
0.20
0.03
0.05
0.02
-
100
90
> 0.5
> 1.0
> 1.5
> 2.0
> 2.5
> 3.0
> 3.5
> 4.0
> 4.5
> 5.0
> 5.5
> 6.0
> 6.5
> 7.0
> 7.5
> 8.0
80
Percent exceedence
70
60
50
40
30
20
10
0
Jan
Feb
UK Waters Model at 50.4°N 5.6°W
Table 2.4c
Mar
Apr
May
Jun
Jul
Aug
Mar 2000 - Nov 2008
Significant Wave Height (m) at Wave Hub - Exceedence Curves
I:\P1209_JPKenny\R2056 metocean\Table 2.4.xls T2.4 09/04/2009
Sep
Oct
Nov
Dec
UK Waters Model at 50.4°N 5.6°W
Mar 2000 - Nov 2008
Significant Wave Height is the resultant of sea and swell; directions are FROM
Data acquired under licence from UK Met Office
Hs (m)
Ind
0.0 to 0.5
0.6 to 1.0
1.1 to 1.5
1.6 to 2.0
2.1 to 2.5
2.6 to 3.0
3.1 to 3.5
3.6 to 4.0
4.1 to 4.5
4.6 to 5.0
5.1 to 5.5
5.6 to 6.0
6.1 to 6.5
6.6 to 7.0
7.1 to 7.5
7.6 to 8.0
8.1 to 8.5
8.6 to 9.0
9.1 to 9.5
9.6 to 10.0
Total
N
50
572
685
483
270
182
70
40
17
13
8
NE
74
498
541
284
143
81
18
4
1
E
28
367
196
61
30
1
3
SE
29
276
164
50
28
5
1
S
17
249
269
194
105
42
9
1
SW
68
530
863
791
738
470
370
269
95
38
17
3
1
1
-
2,390
1,644
686
553
886
4,254
N
0.2
2.3
2.8
1.9
1.1
0.7
0.3
0.2
0.1
0.1
0.0
-
NE
0.3
2.0
2.2
1.1
0.6
0.3
0.1
0.0
0.0
-
E
0.1
1.5
0.8
0.2
0.1
0.0
0.0
-
SE
0.1
1.1
0.7
0.2
0.1
0.0
0.0
-
S
0.1
1.0
1.1
0.8
0.4
0.2
0.0
0.0
-
SW
0.3
2.1
3.5
3.2
3.0
1.9
1.5
1.1
0.4
0.2
0.1
0.0
0.0
0.0
-
9.60
6.60
2.76
2.22
3.56
17.09
[ 0.0 means <0.05 ]
Hs (m)
0.0 to 0.5
0.6 to 1.0
1.1 to 1.5
1.6 to 2.0
2.1 to 2.5
2.6 to 3.0
3.1 to 3.5
3.6 to 4.0
4.1 to 4.5
4.6 to 5.0
5.1 to 5.5
5.6 to 6.0
6.1 to 6.5
6.6 to 7.0
7.1 to 7.5
7.6 to 8.0
8.1 to 8.5
8.6 to 9.0
9.1 to 9.5
9.6 to 10.0
Total
Table 2.5a
Ind
-
Numbers Occurrence
W
NW
Total
443
50
759
2,420
475
5,387
2,271
626
5,615
1,639
525
4,027
1,312
392
3,018
981
308
2,070
831
189
1,491
562
139
1,014
475
65
654
281
56
388
184
47
256
87
23
113
45
13
59
14
7
21
9
5
15
2
1
3
1
3
4
3
1
4
11,560
24,898
Percent Occurrence
W
NW
Total
1.8
0.2
3.0
9.7
1.9
21.6
9.1
2.5
22.6
6.6
2.1
16.2
5.3
1.6
12.1
3.9
1.2
8.3
3.3
0.8
6.0
2.3
0.6
4.1
1.9
0.3
2.6
1.1
0.2
1.6
0.7
0.2
1.0
0.3
0.1
0.5
0.2
0.1
0.2
0.1
0.0
0.1
0.0
0.0
0.1
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
46.43
Significant Wave Height and Direction at Wave Hub - Annual
I:\P1209_JPKenny\R2056 metocean\Table 2.5.xls T2.5a 09/04/2009
2,925
11.75
100.00
UK Waters Model at 50.4°N 5.6°W
Mar 2000 - Nov 2008
Significant Wave Height is the resultant of sea and swell; directions are FROM
Data acquired under licence from UK Met Office
Hs (m)
Ind
0.0 to 0.5
0.6 to 1.0
1.1 to 1.5
1.6 to 2.0
2.1 to 2.5
2.6 to 3.0
3.1 to 3.5
3.6 to 4.0
4.1 to 4.5
4.6 to 5.0
5.1 to 5.5
5.6 to 6.0
6.1 to 6.5
6.6 to 7.0
7.1 to 7.5
7.6 to 8.0
8.1 to 8.5
8.6 to 9.0
9.1 to 9.5
9.6 to 10.0
Total
-
N
1
41
95
110
88
69
29
11
3
1
3
NE
3
89
177
137
78
36
14
1
1
E
2
90
67
34
22
1
3
SE
2
48
42
28
17
1
S
4
33
43
58
30
17
1
451
536
219
138
187
856
N
0.0
0.7
1.7
1.9
1.5
1.2
0.5
0.2
0.1
0.0
0.1
-
NE
0.1
1.6
3.1
2.4
1.4
0.6
0.2
0.0
0.0
-
E
0.0
1.6
1.2
0.6
0.4
0.0
0.1
-
SE
0.0
0.8
0.7
0.5
0.3
0.0
-
S
0.1
0.6
0.8
1.0
0.5
0.3
0.0
0.0
-
SW
0.0
0.6
1.7
1.6
2.3
2.4
2.1
2.5
1.1
0.5
0.2
0.0
0.0
-
7.92
9.41
3.85
2.42
3.28
15.03
1
SW
2
36
96
92
132
136
117
141
62
28
11
2
1
[ 0.0 means <0.05 ]
Hs (m)
0.0 to 0.5
0.6 to 1.0
1.1 to 1.5
1.6 to 2.0
2.1 to 2.5
2.6 to 3.0
3.1 to 3.5
3.6 to 4.0
4.1 to 4.5
4.6 to 5.0
5.1 to 5.5
5.6 to 6.0
6.1 to 6.5
6.6 to 7.0
7.1 to 7.5
7.6 to 8.0
8.1 to 8.5
8.6 to 9.0
9.1 to 9.5
9.6 to 10.0
Total
Table 2.5b
Ind
-
Numbers Occurrence
W
NW
Total
30
2
46
282
36
655
359
54
933
336
63
858
293
76
736
274
91
625
255
59
478
244
65
462
268
36
371
186
23
238
113
23
150
58
13
73
33
6
40
12
5
17
3
3
6
2
2
3
3
1
1
2,749
5,694
Percent Occurrence
W
NW
Total
0.5
0.0
0.8
5.0
0.6
11.5
6.3
0.9
16.4
5.9
1.1
15.1
5.1
1.3
12.9
4.8
1.6
11.0
4.5
1.0
8.4
4.3
1.1
8.1
4.7
0.6
6.5
3.3
0.4
4.2
2.0
0.4
2.6
1.0
0.2
1.3
0.6
0.1
0.7
0.2
0.1
0.3
0.1
0.1
0.1
0.0
0.0
0.1
0.1
0.0
0.0
48.28
Significant Wave Height and Direction at Wave Hub: Dec-Feb
I:\P1209_JPKenny\R2056 metocean\Table 2.5.xls T2.5b 09/04/2009
558
9.80
100.00
UK Waters Model at 50.4°N 5.6°W
Mar 2000 - Nov 2008
Significant Wave Height is the resultant of sea and swell; directions are FROM
Data acquired under licence from UK Met Office
Hs (m)
Ind
N
18
197
239
138
87
50
16
12
9
8
3
NE
30
137
175
90
46
35
3
2
E
10
128
77
15
6
SE
9
87
45
14
6
3
S
2
28
86
48
39
9
5
SW
7
107
189
204
192
150
99
39
12
5
3
1
-
777
518
236
164
217
1,008
N
0.3
3.1
3.8
2.2
1.4
0.8
0.3
0.2
0.1
0.1
0.0
-
NE
0.5
2.2
2.8
1.4
0.7
0.6
0.0
0.0
-
E
0.2
2.0
1.2
0.2
0.1
-
SE
0.1
1.4
0.7
0.2
0.1
0.0
-
S
0.0
0.4
1.4
0.8
0.6
0.1
0.1
-
SW
0.1
1.7
3.0
3.2
3.0
2.4
1.6
0.6
0.2
0.1
0.0
0.0
-
12.25
8.17
3.72
2.59
3.42
15.90
0.0 to 0.5
0.6 to 1.0
1.1 to 1.5
1.6 to 2.0
2.1 to 2.5
2.6 to 3.0
3.1 to 3.5
3.6 to 4.0
4.1 to 4.5
4.6 to 5.0
5.1 to 5.5
5.6 to 6.0
6.1 to 6.5
6.6 to 7.0
7.1 to 7.5
7.6 to 8.0
8.1 to 8.5
8.6 to 9.0
9.1 to 9.5
9.6 to 10.0
Total
[ 0.0 means <0.05 ]
Hs (m)
0.0 to 0.5
0.6 to 1.0
1.1 to 1.5
1.6 to 2.0
2.1 to 2.5
2.6 to 3.0
3.1 to 3.5
3.6 to 4.0
4.1 to 4.5
4.6 to 5.0
5.1 to 5.5
5.6 to 6.0
6.1 to 6.5
6.6 to 7.0
7.1 to 7.5
7.6 to 8.0
8.1 to 8.5
8.6 to 9.0
9.1 to 9.5
9.6 to 10.0
Total
Table 2.5c
Ind
-
Numbers Occurrence
W
NW
Total
121
14
211
583
97
1,364
545
123
1,479
408
102
1,019
401
92
869
269
70
586
218
36
377
101
26
180
73
11
105
46
17
76
30
12
48
6
5
12
3
4
7
1
1
2
1
1
1
1
1
1
2
1
3
2,808
6,341
Percent Occurrence
W
NW
Total
1.9
0.2
3.3
9.2
1.5
21.5
8.6
1.9
23.3
6.4
1.6
16.1
6.3
1.5
13.7
4.2
1.1
9.2
3.4
0.6
5.9
1.6
0.4
2.8
1.2
0.2
1.7
0.7
0.3
1.2
0.5
0.2
0.8
0.1
0.1
0.2
0.0
0.1
0.1
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
44.28
Significant Wave Height and Direction at Wave Hub: Mar-May
I:\P1209_JPKenny\R2056 metocean\Table 2.5.xls T2.5c 09/04/2009
613
9.67
100.00
UK Waters Model at 50.4°N 5.6°W
Mar 2000 - Nov 2008
Significant Wave Height is the resultant of sea and swell; directions are FROM
Data acquired under licence from UK Met Office
Hs (m)
Ind
N
21
229
205
105
20
15
9
6
NE
18
109
40
13
2
1
E
6
58
16
6
SE
11
61
36
2
S
8
73
64
30
6
2
SW
56
266
368
283
207
52
22
7
2
-
610
183
86
110
183
1,263
N
0.3
3.5
3.1
1.6
0.3
0.2
0.1
0.1
-
NE
0.3
1.7
0.6
0.2
0.0
0.0
-
E
0.1
0.9
0.2
0.1
-
SE
0.2
0.9
0.5
0.0
-
S
0.1
1.1
1.0
0.5
0.1
0.0
-
SW
0.8
4.0
5.6
4.3
3.1
0.8
0.3
0.1
0.0
-
9.24
2.77
1.30
1.67
2.77
19.13
0.0 to 0.5
0.6 to 1.0
1.1 to 1.5
1.6 to 2.0
2.1 to 2.5
2.6 to 3.0
3.1 to 3.5
3.6 to 4.0
4.1 to 4.5
4.6 to 5.0
5.1 to 5.5
5.6 to 6.0
6.1 to 6.5
6.6 to 7.0
7.1 to 7.5
7.6 to 8.0
8.1 to 8.5
8.6 to 9.0
9.1 to 9.5
9.6 to 10.0
Total
[ 0.0 means <0.05 ]
Hs (m)
0.0 to 0.5
0.6 to 1.0
1.1 to 1.5
1.6 to 2.0
2.1 to 2.5
2.6 to 3.0
3.1 to 3.5
3.6 to 4.0
4.1 to 4.5
4.6 to 5.0
5.1 to 5.5
5.6 to 6.0
6.1 to 6.5
6.6 to 7.0
7.1 to 7.5
7.6 to 8.0
8.1 to 8.5
8.6 to 9.0
9.1 to 9.5
9.6 to 10.0
Total
Table 2.5d
Ind
-
Numbers Occurrence
W
NW
Total
206
32
358
1,057
265
2,118
826
292
1,847
498
208
1,145
288
91
614
164
43
277
102
11
144
47
7
67
16
18
5
5
8
8
1
1
3,218
6,602
Percent Occurrence
W
NW
Total
3.1
0.5
5.4
16.0
4.0
32.1
12.5
4.4
28.0
7.5
3.2
17.3
4.4
1.4
9.3
2.5
0.7
4.2
1.5
0.2
2.2
0.7
0.1
1.0
0.2
0.3
0.1
0.1
0.1
0.1
0.0
0.0
48.74
Significant Wave Height and Direction at Wave Hub: Jun-Aug
I:\P1209_JPKenny\R2056 metocean\Table 2.5.xls T2.5d 09/04/2009
949
14.37
100.00
UK Waters Model at 50.4°N 5.6°W
Mar 2000 - Nov 2008
Significant Wave Height is the resultant of sea and swell; directions are FROM
Data acquired under licence from UK Met Office
Hs (m)
Ind
0.0 to 0.5
0.6 to 1.0
1.1 to 1.5
1.6 to 2.0
2.1 to 2.5
2.6 to 3.0
3.1 to 3.5
3.6 to 4.0
4.1 to 4.5
4.6 to 5.0
5.1 to 5.5
5.6 to 6.0
6.1 to 6.5
6.6 to 7.0
7.1 to 7.5
7.6 to 8.0
8.1 to 8.5
8.6 to 9.0
9.1 to 9.5
9.6 to 10.0
Total
N
10
105
146
130
75
48
16
11
5
4
2
NE
23
163
149
44
17
9
1
1
E
10
91
36
6
2
SE
7
80
41
6
5
1
1
S
3
115
76
58
30
14
3
SW
3
121
210
212
207
132
132
82
19
5
3
1
-
552
407
145
141
299
1,127
N
0.2
1.7
2.3
2.1
1.2
0.8
0.3
0.2
0.1
0.1
0.0
-
NE
0.4
2.6
2.4
0.7
0.3
0.1
0.0
0.0
-
E
0.2
1.5
0.6
0.1
0.0
-
SE
0.1
1.3
0.7
0.1
0.1
0.0
0.0
-
S
0.0
1.8
1.2
0.9
0.5
0.2
0.0
-
SW
0.0
1.9
3.4
3.4
3.3
2.1
2.1
1.3
0.3
0.1
0.0
0.0
-
8.82
6.50
2.32
2.25
4.78
18.00
[ 0.0 means <0.05 ]
Hs (m)
0.0 to 0.5
0.6 to 1.0
1.1 to 1.5
1.6 to 2.0
2.1 to 2.5
2.6 to 3.0
3.1 to 3.5
3.6 to 4.0
4.1 to 4.5
4.6 to 5.0
5.1 to 5.5
5.6 to 6.0
6.1 to 6.5
6.6 to 7.0
7.1 to 7.5
7.6 to 8.0
8.1 to 8.5
8.6 to 9.0
9.1 to 9.5
9.6 to 10.0
Total
Table 2.5e
Ind
-
Numbers Occurrence
W
NW
Total
86
2
144
498
77
1,250
541
157
1,356
397
152
1,005
330
133
799
274
104
582
256
83
492
170
41
305
118
18
160
44
16
69
33
12
50
22
5
27
9
3
12
1
1
2
6
1
8
2,785
6,261
Percent Occurrence
W
NW
Total
1.4
0.0
2.3
8.0
1.2
20.0
8.6
2.5
21.7
6.3
2.4
16.1
5.3
2.1
12.8
4.4
1.7
9.3
4.1
1.3
7.9
2.7
0.7
4.9
1.9
0.3
2.6
0.7
0.3
1.1
0.5
0.2
0.8
0.4
0.1
0.4
0.1
0.0
0.2
0.0
0.0
0.0
0.1
0.0
0.1
44.48
Significant Wave Height and Direction at Wave Hub: Sep-Nov
I:\P1209_JPKenny\R2056 metocean\Table 2.5.xls T2.5e 09/04/2009
805
12.86
100.00
-2.00
-1.00
0.00
1.00
MIKE21 MSTC at
100-year depth
Joint tide & surge factor E50
MSTC not allowed to fall below
2.00
2.00
kp 1.2
9m
1.07
0.05
Newlyn
m/s
1.50
1.00
50 yr surge (depth-av)
0.2
Tide at 1 m asb
Max
Spring
Neap
m/s
0.18
0.14
0.05
MSTC
0.50
50yr surge
0.00
50yr total
-0.50
x 0.5m/s
m/s
-1.00
Current profile obeys 1/10th power law
between seabed and 70% height
-1.50
Speeds are uniform in the upper 30%
of the water column
-2.00
Total current (directions TOWARDS)
m/s
N
NE
100-yr
0.28
0.41
50-yr
0.27
0.40
10-yr
0.26
0.39
1-yr
0.25
0.37
1-yr monthly
Jan
0.22
0.35
Feb
0.22
0.35
Mar
0.20
0.34
Apr
0.19
0.32
May
0.17
0.31
Jun
0.16
0.29
Jul
0.14
0.27
Aug
0.16
0.29
Sep
0.19
0.32
Oct
0.19
0.32
Nov
0.20
0.34
Dec
0.22
0.35
E
0.25
0.25
0.24
0.23
SE
0.16
0.16
0.16
0.15
S
0.16
0.16
0.16
0.15
SW
0.41
0.40
0.39
0.37
W
0.25
0.25
0.24
0.23
Surface currents
NW
Non-dir
0.28
0.41
0.27
0.40
0.26
0.39
0.25
0.37
0.22
0.22
0.20
0.19
0.18
0.17
0.16
0.17
0.19
0.19
0.20
0.22
0.14
0.14
0.13
0.12
0.11
0.11
0.10
0.11
0.12
0.12
0.13
0.14
0.14
0.14
0.13
0.12
0.11
0.11
0.10
0.11
0.12
0.12
0.13
0.14
0.35
0.35
0.34
0.32
0.31
0.29
0.27
0.29
0.32
0.32
0.34
0.35
0.22
0.22
0.20
0.19
0.18
0.17
0.16
0.17
0.19
0.19
0.20
0.22
0.22
0.22
0.20
0.19
0.17
0.16
0.14
0.16
0.19
0.19
0.20
0.22
0.35
0.35
0.34
0.32
0.31
0.29
0.27
0.29
0.32
0.32
0.34
0.35
Total current (directions TOWARDS)
1 m above seabed
m/s
N
NE
E
SE
S
SW
W
NW
Non-dir
100-yr
0.23
0.34
0.21
0.14
0.14
0.34
0.21
0.23
0.34
50-yr
0.22
0.34
0.21
0.13
0.13
0.34
0.21
0.22
0.34
10-yr
0.22
0.33
0.20
0.13
0.13
0.33
0.20
0.22
0.33
1-yr
0.21
0.31
0.19
0.12
0.12
0.31
0.19
0.21
0.31
1-yr monthly
Jan
0.18
0.29
0.18
0.12
0.12
0.29
0.18
0.18
0.29
Feb
0.18
0.29
0.18
0.12
0.12
0.29
0.18
0.18
0.29
Mar
0.17
0.28
0.17
0.11
0.11
0.28
0.17
0.17
0.28
Apr
0.16
0.27
0.16
0.10
0.10
0.27
0.16
0.16
0.27
May
0.14
0.25
0.15
0.10
0.10
0.25
0.15
0.14
0.25
Jun
0.13
0.24
0.14
0.09
0.09
0.24
0.14
0.13
0.24
Jul
0.12
0.23
0.13
0.08
0.08
0.23
0.13
0.12
0.23
Aug
0.13
0.24
0.14
0.09
0.09
0.24
0.14
0.13
0.24
Sep
0.16
0.27
0.16
0.10
0.10
0.27
0.16
0.16
0.27
Oct
0.16
0.27
0.16
0.10
0.10
0.27
0.16
0.16
0.27
Nov
0.17
0.28
0.17
0.11
0.11
0.28
0.17
0.17
0.28
Dec
0.18
0.29
0.18
0.12
0.12
0.29
0.18
0.18
0.29
Notes
Storm surge currents from Proudman Continental Shelf Model; interpolated for spatial variation
Storm surge currents monthly scaling factors inferred from wave climate
Tidal currents from Metoc hydrodynamic model; combined tide-surge relationships empirical to nearest standard port
Table 3.1.1
Extreme Current Speeds at Wave Hub Cable - depth 1 m CD (approx kp 1.2)
I:\P1209_JPKenny\R2056 metocean\Table 3.xls 3.1.1 09/04/2009 09:13
-2.00
-1.00
0.00
1.00
MIKE21 MSTC at
100-year depth
Joint tide & surge factor E50
MSTC not allowed to fall below
2.00
2.00
kp 1.25
10m
1.07
0.05
Newlyn
m/s
1.50
1.00
50 yr surge (depth-av)
0.2
Tide at 1 m asb
Max
Spring
Neap
m/s
0.17
0.14
0.05
MSTC
0.50
50yr surge
0.00
50yr total
-0.50
x 0.5m/s
m/s
-1.00
Current profile obeys 1/10th power law
between seabed and 70% height
-1.50
Speeds are uniform in the upper 30%
of the water column
-2.00
Total current (directions TOWARDS)
m/s
N
NE
100-yr
0.28
0.41
50-yr
0.27
0.40
10-yr
0.26
0.39
1-yr
0.25
0.37
1-yr monthly
Jan
0.22
0.35
Feb
0.22
0.35
Mar
0.20
0.34
Apr
0.19
0.32
May
0.17
0.31
Jun
0.16
0.29
Jul
0.14
0.27
Aug
0.16
0.29
Sep
0.19
0.32
Oct
0.19
0.32
Nov
0.20
0.34
Dec
0.22
0.35
E
0.26
0.26
0.25
0.24
SE
0.16
0.16
0.16
0.15
S
0.16
0.16
0.16
0.15
SW
0.41
0.40
0.39
0.37
W
0.26
0.26
0.25
0.24
Surface currents
NW
Non-dir
0.28
0.41
0.27
0.40
0.26
0.39
0.25
0.37
0.22
0.22
0.21
0.20
0.19
0.18
0.17
0.18
0.20
0.20
0.21
0.22
0.14
0.14
0.13
0.12
0.11
0.11
0.10
0.11
0.12
0.12
0.13
0.14
0.14
0.14
0.13
0.12
0.11
0.11
0.10
0.11
0.12
0.12
0.13
0.14
0.35
0.35
0.34
0.32
0.31
0.29
0.27
0.29
0.32
0.32
0.34
0.35
0.22
0.22
0.21
0.20
0.19
0.18
0.17
0.18
0.20
0.20
0.21
0.22
0.22
0.22
0.20
0.19
0.17
0.16
0.14
0.16
0.19
0.19
0.20
0.22
0.35
0.35
0.34
0.32
0.31
0.29
0.27
0.29
0.32
0.32
0.34
0.35
Total current (directions TOWARDS)
1 m above seabed
m/s
N
NE
E
SE
S
SW
W
NW
Non-dir
100-yr
0.23
0.34
0.22
0.14
0.14
0.34
0.22
0.23
0.34
50-yr
0.22
0.33
0.21
0.13
0.13
0.33
0.21
0.22
0.33
10-yr
0.22
0.32
0.21
0.13
0.13
0.32
0.21
0.22
0.32
1-yr
0.21
0.31
0.20
0.12
0.12
0.31
0.20
0.21
0.31
1-yr monthly
Jan
0.18
0.29
0.18
0.11
0.11
0.29
0.18
0.18
0.29
Feb
0.18
0.29
0.18
0.11
0.11
0.29
0.18
0.18
0.29
Mar
0.17
0.28
0.17
0.11
0.11
0.28
0.17
0.17
0.28
Apr
0.15
0.27
0.16
0.10
0.10
0.27
0.16
0.15
0.27
May
0.14
0.25
0.15
0.09
0.09
0.25
0.15
0.14
0.25
Jun
0.13
0.24
0.15
0.09
0.09
0.24
0.15
0.13
0.24
Jul
0.11
0.22
0.14
0.08
0.08
0.22
0.14
0.11
0.22
Aug
0.13
0.24
0.15
0.09
0.09
0.24
0.15
0.13
0.24
Sep
0.15
0.27
0.16
0.10
0.10
0.27
0.16
0.15
0.27
Oct
0.15
0.27
0.16
0.10
0.10
0.27
0.16
0.15
0.27
Nov
0.17
0.28
0.17
0.11
0.11
0.28
0.17
0.17
0.28
Dec
0.18
0.29
0.18
0.11
0.11
0.29
0.18
0.18
0.29
Notes
Storm surge currents from Proudman Continental Shelf Model; interpolated for spatial variation
Storm surge currents monthly scaling factors inferred from wave climate
Tidal currents from Metoc hydrodynamic model; combined tide-surge relationships empirical to nearest standard port
Table 3.1.2
Extreme Current Speeds at Wave Hub Cable - depth 2 m CD, approx kp 1.25
I:\P1209_JPKenny\R2056 metocean\Table 3.xls 3.1.2 09/04/2009 09:13
-2.00
-1.00
0.00
1.00
MIKE21 MSTC at
100-year depth
Joint tide & surge factor E50
MSTC not allowed to fall below
2.00
2.00
kp 1.3
11m
1.07
0.05
Newlyn
m/s
1.50
1.00
50 yr surge (depth-av)
0.2
Tide at 1 m asb
Max
Spring
Neap
m/s
0.17
0.14
0.05
MSTC
0.50
50yr surge
0.00
50yr total
-0.50
x 0.5m/s
m/s
-1.00
Current profile obeys 1/10th power law
between seabed and 70% height
-1.50
Speeds are uniform in the upper 30%
of the water column
-2.00
Total current (directions TOWARDS)
m/s
N
NE
100-yr
0.28
0.41
50-yr
0.27
0.40
10-yr
0.26
0.39
1-yr
0.25
0.37
1-yr monthly
Jan
0.22
0.35
Feb
0.22
0.35
Mar
0.20
0.34
Apr
0.19
0.32
May
0.17
0.31
Jun
0.16
0.29
Jul
0.14
0.27
Aug
0.16
0.29
Sep
0.19
0.32
Oct
0.19
0.32
Nov
0.20
0.34
Dec
0.22
0.35
E
0.27
0.26
0.25
0.24
SE
0.16
0.16
0.16
0.15
S
0.16
0.16
0.16
0.15
SW
0.41
0.40
0.39
0.37
W
0.27
0.26
0.25
0.24
Surface currents
NW
Non-dir
0.28
0.41
0.27
0.40
0.26
0.39
0.25
0.37
0.23
0.23
0.22
0.21
0.20
0.18
0.17
0.18
0.21
0.21
0.22
0.23
0.14
0.14
0.13
0.12
0.11
0.11
0.10
0.11
0.12
0.12
0.13
0.14
0.14
0.14
0.13
0.12
0.11
0.11
0.10
0.11
0.12
0.12
0.13
0.14
0.35
0.35
0.34
0.32
0.31
0.29
0.27
0.29
0.32
0.32
0.34
0.35
0.23
0.23
0.22
0.21
0.20
0.18
0.17
0.18
0.21
0.21
0.22
0.23
0.22
0.22
0.20
0.19
0.17
0.16
0.14
0.16
0.19
0.19
0.20
0.22
0.35
0.35
0.34
0.32
0.31
0.29
0.27
0.29
0.32
0.32
0.34
0.35
Total current (directions TOWARDS)
1 m above seabed
m/s
N
NE
E
SE
S
SW
W
NW
Non-dir
100-yr
0.22
0.34
0.22
0.13
0.13
0.34
0.22
0.22
0.34
50-yr
0.22
0.33
0.21
0.13
0.13
0.33
0.21
0.22
0.33
10-yr
0.21
0.32
0.21
0.13
0.13
0.32
0.21
0.21
0.32
1-yr
0.20
0.30
0.20
0.12
0.12
0.30
0.20
0.20
0.30
1-yr monthly
Jan
0.18
0.29
0.19
0.11
0.11
0.29
0.19
0.18
0.29
Feb
0.18
0.29
0.19
0.11
0.11
0.29
0.19
0.18
0.29
Mar
0.17
0.28
0.18
0.11
0.11
0.28
0.18
0.17
0.28
Apr
0.15
0.26
0.17
0.10
0.10
0.26
0.17
0.15
0.26
May
0.14
0.25
0.16
0.09
0.09
0.25
0.16
0.14
0.25
Jun
0.13
0.24
0.15
0.09
0.09
0.24
0.15
0.13
0.24
Jul
0.11
0.22
0.14
0.08
0.08
0.22
0.14
0.11
0.22
Aug
0.13
0.24
0.15
0.09
0.09
0.24
0.15
0.13
0.24
Sep
0.15
0.26
0.17
0.10
0.10
0.26
0.17
0.15
0.26
Oct
0.15
0.26
0.17
0.10
0.10
0.26
0.17
0.15
0.26
Nov
0.17
0.28
0.18
0.11
0.11
0.28
0.18
0.17
0.28
Dec
0.18
0.29
0.19
0.11
0.11
0.29
0.19
0.18
0.29
Notes
Storm surge currents from Proudman Continental Shelf Model; interpolated for spatial variation
Storm surge currents monthly scaling factors inferred from wave climate
Tidal currents from Metoc hydrodynamic model; combined tide-surge relationships empirical to nearest standard port
Table 3.1.3
Extreme Current Speeds at Wave Hub Cable - depth 3 m CD, approx kp 1.3
I:\P1209_JPKenny\R2056 metocean\Table 3.xls 3.1.3 09/04/2009 09:13
-2.00
-1.00
0.00
1.00
MIKE21 MSTC at
100-year depth
Joint tide & surge factor E50
MSTC not allowed to fall below
2.00
2.00
kp 1.35
12m
1.07
0.05
Newlyn
m/s
1.50
1.00
50 yr surge (depth-av)
0.2
Tide at 1 m asb
Max
Spring
Neap
m/s
0.17
0.14
0.05
MSTC
0.50
50yr surge
0.00
50yr total
-0.50
x 0.5m/s
m/s
-1.00
Current profile obeys 1/10th power law
between seabed and 70% height
-1.50
Speeds are uniform in the upper 30%
of the water column
-2.00
Total current (directions TOWARDS)
m/s
N
NE
100-yr
0.28
0.41
50-yr
0.27
0.40
10-yr
0.26
0.39
1-yr
0.25
0.37
1-yr monthly
Jan
0.22
0.36
Feb
0.22
0.36
Mar
0.20
0.34
Apr
0.19
0.32
May
0.17
0.31
Jun
0.16
0.29
Jul
0.14
0.27
Aug
0.16
0.29
Sep
0.19
0.32
Oct
0.19
0.32
Nov
0.20
0.34
Dec
0.22
0.36
E
0.26
0.25
0.24
0.23
SE
0.17
0.16
0.16
0.15
S
0.17
0.16
0.16
0.15
SW
0.41
0.40
0.39
0.37
W
0.26
0.25
0.24
0.23
Surface currents
NW
Non-dir
0.28
0.41
0.27
0.40
0.26
0.39
0.25
0.37
0.22
0.22
0.21
0.19
0.18
0.17
0.16
0.17
0.19
0.19
0.21
0.22
0.14
0.14
0.13
0.12
0.11
0.11
0.10
0.11
0.12
0.12
0.13
0.14
0.14
0.14
0.13
0.12
0.11
0.11
0.10
0.11
0.12
0.12
0.13
0.14
0.36
0.36
0.34
0.32
0.31
0.29
0.27
0.29
0.32
0.32
0.34
0.36
0.22
0.22
0.21
0.19
0.18
0.17
0.16
0.17
0.19
0.19
0.21
0.22
0.22
0.22
0.20
0.19
0.17
0.16
0.14
0.16
0.19
0.19
0.20
0.22
0.36
0.36
0.34
0.32
0.31
0.29
0.27
0.29
0.32
0.32
0.34
0.36
Total current (directions TOWARDS)
1 m above seabed
m/s
N
NE
E
SE
S
SW
W
NW
Non-dir
100-yr
0.22
0.33
0.21
0.13
0.13
0.33
0.21
0.22
0.33
50-yr
0.22
0.33
0.20
0.13
0.13
0.33
0.20
0.22
0.33
10-yr
0.21
0.32
0.20
0.13
0.13
0.32
0.20
0.21
0.32
1-yr
0.20
0.30
0.19
0.12
0.12
0.30
0.19
0.20
0.30
1-yr monthly
Jan
0.18
0.29
0.18
0.11
0.11
0.29
0.18
0.18
0.29
Feb
0.18
0.29
0.18
0.11
0.11
0.29
0.18
0.18
0.29
Mar
0.17
0.27
0.17
0.11
0.11
0.27
0.17
0.17
0.27
Apr
0.15
0.26
0.16
0.10
0.10
0.26
0.16
0.15
0.26
May
0.14
0.25
0.15
0.09
0.09
0.25
0.15
0.14
0.25
Jun
0.13
0.23
0.14
0.09
0.09
0.23
0.14
0.13
0.23
Jul
0.11
0.22
0.13
0.08
0.08
0.22
0.13
0.11
0.22
Aug
0.13
0.23
0.14
0.09
0.09
0.23
0.14
0.13
0.23
Sep
0.15
0.26
0.16
0.10
0.10
0.26
0.16
0.15
0.26
Oct
0.15
0.26
0.16
0.10
0.10
0.26
0.16
0.15
0.26
Nov
0.17
0.27
0.17
0.11
0.11
0.27
0.17
0.17
0.27
Dec
0.18
0.29
0.18
0.11
0.11
0.29
0.18
0.18
0.29
Notes
Storm surge currents from Proudman Continental Shelf Model; interpolated for spatial variation
Storm surge currents monthly scaling factors inferred from wave climate
Tidal currents from Metoc hydrodynamic model; combined tide-surge relationships empirical to nearest standard port
Table 3.1.4
Extreme Current Speeds at Wave Hub Cable - depth 4 m CD, approx kp 1.35
I:\P1209_JPKenny\R2056 metocean\Table 3.xls 3.1.4 09/04/2009 09:13
-2.00
-1.00
0.00
1.00
MIKE21 MSTC at
100-year depth
Joint tide & surge factor E50
MSTC not allowed to fall below
2.00
2.00
kp 1.4
13m
1.07
0.05
Newlyn
m/s
1.50
1.00
50 yr surge (depth-av)
0.2
Tide at 1 m asb
Max
Spring
Neap
m/s
0.17
0.14
0.05
MSTC
0.50
50yr surge
0.00
50yr total
-0.50
x 0.5m/s
m/s
-1.00
Current profile obeys 1/10th power law
between seabed and 70% height
-1.50
Speeds are uniform in the upper 30%
of the water column
-2.00
Total current (directions TOWARDS)
m/s
N
NE
100-yr
0.28
0.42
50-yr
0.28
0.41
10-yr
0.27
0.40
1-yr
0.25
0.38
1-yr monthly
Jan
0.22
0.36
Feb
0.22
0.36
Mar
0.21
0.35
Apr
0.19
0.33
May
0.17
0.31
Jun
0.16
0.30
Jul
0.14
0.28
Aug
0.16
0.30
Sep
0.19
0.33
Oct
0.19
0.33
Nov
0.21
0.35
Dec
0.22
0.36
E
0.28
0.28
0.27
0.25
SE
0.17
0.16
0.16
0.15
S
0.17
0.16
0.16
0.15
SW
0.42
0.41
0.40
0.38
W
0.28
0.28
0.27
0.25
Surface currents
NW
Non-dir
0.28
0.42
0.28
0.41
0.27
0.40
0.25
0.38
0.24
0.24
0.23
0.22
0.21
0.20
0.18
0.20
0.22
0.22
0.23
0.24
0.14
0.14
0.13
0.12
0.12
0.11
0.10
0.11
0.12
0.12
0.13
0.14
0.14
0.14
0.13
0.12
0.12
0.11
0.10
0.11
0.12
0.12
0.13
0.14
0.36
0.36
0.35
0.33
0.31
0.30
0.28
0.30
0.33
0.33
0.35
0.36
0.24
0.24
0.23
0.22
0.21
0.20
0.18
0.20
0.22
0.22
0.23
0.24
0.22
0.22
0.21
0.19
0.17
0.16
0.14
0.16
0.19
0.19
0.21
0.22
0.36
0.36
0.35
0.33
0.31
0.30
0.28
0.30
0.33
0.33
0.35
0.36
Total current (directions TOWARDS)
1 m above seabed
m/s
N
NE
E
SE
S
SW
W
NW
Non-dir
100-yr
0.23
0.34
0.23
0.13
0.13
0.34
0.23
0.23
0.34
50-yr
0.22
0.33
0.22
0.13
0.13
0.33
0.22
0.22
0.33
10-yr
0.21
0.32
0.21
0.13
0.13
0.32
0.21
0.21
0.32
1-yr
0.20
0.30
0.20
0.12
0.12
0.30
0.20
0.20
0.30
1-yr monthly
Jan
0.18
0.29
0.19
0.11
0.11
0.29
0.19
0.18
0.29
Feb
0.18
0.29
0.19
0.11
0.11
0.29
0.19
0.18
0.29
Mar
0.17
0.28
0.19
0.11
0.11
0.28
0.19
0.17
0.28
Apr
0.15
0.26
0.18
0.10
0.10
0.26
0.18
0.15
0.26
May
0.14
0.25
0.17
0.09
0.09
0.25
0.17
0.14
0.25
Jun
0.13
0.24
0.16
0.09
0.09
0.24
0.16
0.13
0.24
Jul
0.11
0.22
0.15
0.08
0.08
0.22
0.15
0.11
0.22
Aug
0.13
0.24
0.16
0.09
0.09
0.24
0.16
0.13
0.24
Sep
0.15
0.26
0.18
0.10
0.10
0.26
0.18
0.15
0.26
Oct
0.15
0.26
0.18
0.10
0.10
0.26
0.18
0.15
0.26
Nov
0.17
0.28
0.19
0.11
0.11
0.28
0.19
0.17
0.28
Dec
0.18
0.29
0.19
0.11
0.11
0.29
0.19
0.18
0.29
Notes
Storm surge currents from Proudman Continental Shelf Model; interpolated for spatial variation
Storm surge currents monthly scaling factors inferred from wave climate
Tidal currents from Metoc hydrodynamic model; combined tide-surge relationships empirical to nearest standard port
Table 3.1.5
Extreme Current Speeds at Wave Hub Cable - depth 5 m CD, approx kp 1.4
I:\P1209_JPKenny\R2056 metocean\Table 3.xls 3.1.5 09/04/2009 09:13
-2.00
-1.00
0.00
1.00
MIKE21 MSTC at
100-year depth
Joint tide & surge factor E50
MSTC not allowed to fall below
2.00
2.00
kp 1.5
14m
1.07
0.05
Newlyn
m/s
1.50
1.00
50 yr surge (depth-av)
0.2
Tide at 1 m asb
Max
Spring
Neap
m/s
0.18
0.14
0.05
MSTC
0.50
50yr surge
0.00
50yr total
-0.50
x 0.5m/s
m/s
-1.00
Current profile obeys 1/10th power law
between seabed and 70% height
-1.50
Speeds are uniform in the upper 30%
of the water column
-2.00
Total current (directions TOWARDS)
m/s
N
NE
100-yr
0.29
0.43
50-yr
0.28
0.42
10-yr
0.27
0.41
1-yr
0.26
0.39
1-yr monthly
Jan
0.23
0.37
Feb
0.23
0.37
Mar
0.21
0.36
Apr
0.19
0.34
May
0.18
0.32
Jun
0.16
0.30
Jul
0.14
0.29
Aug
0.16
0.30
Sep
0.19
0.34
Oct
0.19
0.34
Nov
0.21
0.36
Dec
0.23
0.37
E
0.29
0.28
0.28
0.26
SE
0.17
0.17
0.16
0.16
S
0.17
0.17
0.16
0.16
SW
0.43
0.42
0.41
0.39
W
0.29
0.28
0.28
0.26
Surface currents
NW
Non-dir
0.29
0.43
0.28
0.42
0.27
0.41
0.26
0.39
0.25
0.25
0.24
0.23
0.21
0.20
0.19
0.20
0.23
0.23
0.24
0.25
0.14
0.14
0.13
0.13
0.12
0.11
0.10
0.11
0.13
0.13
0.13
0.14
0.14
0.14
0.13
0.13
0.12
0.11
0.10
0.11
0.13
0.13
0.13
0.14
0.37
0.37
0.36
0.34
0.32
0.30
0.29
0.30
0.34
0.34
0.36
0.37
0.25
0.25
0.24
0.23
0.21
0.20
0.19
0.20
0.23
0.23
0.24
0.25
0.23
0.23
0.21
0.19
0.18
0.16
0.14
0.16
0.19
0.19
0.21
0.23
0.37
0.37
0.36
0.34
0.32
0.30
0.29
0.30
0.34
0.34
0.36
0.37
Total current (directions TOWARDS)
1 m above seabed
m/s
N
NE
E
SE
S
SW
W
NW
Non-dir
100-yr
0.23
0.35
0.23
0.14
0.14
0.35
0.23
0.23
0.35
50-yr
0.22
0.34
0.23
0.14
0.14
0.34
0.23
0.22
0.34
10-yr
0.22
0.33
0.22
0.13
0.13
0.33
0.22
0.22
0.33
1-yr
0.21
0.31
0.21
0.12
0.12
0.31
0.21
0.21
0.31
1-yr monthly
Jan
0.18
0.30
0.20
0.11
0.11
0.30
0.20
0.18
0.30
Feb
0.18
0.30
0.20
0.11
0.11
0.30
0.20
0.18
0.30
Mar
0.17
0.28
0.19
0.11
0.11
0.28
0.19
0.17
0.28
Apr
0.16
0.27
0.18
0.10
0.10
0.27
0.18
0.16
0.27
May
0.14
0.26
0.17
0.09
0.09
0.26
0.17
0.14
0.26
Jun
0.13
0.24
0.16
0.09
0.09
0.24
0.16
0.13
0.24
Jul
0.11
0.23
0.15
0.08
0.08
0.23
0.15
0.11
0.23
Aug
0.13
0.24
0.16
0.09
0.09
0.24
0.16
0.13
0.24
Sep
0.16
0.27
0.18
0.10
0.10
0.27
0.18
0.16
0.27
Oct
0.16
0.27
0.18
0.10
0.10
0.27
0.18
0.16
0.27
Nov
0.17
0.28
0.19
0.11
0.11
0.28
0.19
0.17
0.28
Dec
0.18
0.30
0.20
0.11
0.11
0.30
0.20
0.18
0.30
Notes
Storm surge currents from Proudman Continental Shelf Model; interpolated for spatial variation
Storm surge currents monthly scaling factors inferred from wave climate
Tidal currents from Metoc hydrodynamic model; combined tide-surge relationships empirical to nearest standard port
Table 3.1.6
Extreme Current Speeds at Wave Hub Cable - depth 6 m CD, approx kp 1.5
I:\P1209_JPKenny\R2056 metocean\Table 3.xls 3.1.6 09/04/2009 09:13
-2.00
-1.00
0.00
1.00
MIKE21 MSTC at
100-year depth
Joint tide & surge factor E50
MSTC not allowed to fall below
2.00
2.00
kp 1.65
16m
1.07
0.05
Newlyn
m/s
1.50
1.00
50 yr surge (depth-av)
0.2
Tide at 1 m asb
Max
Spring
Neap
m/s
0.18
0.14
0.05
MSTC
0.50
50yr surge
0.00
50yr total
-0.50
x 0.5m/s
m/s
-1.00
Current profile obeys 1/10th power law
between seabed and 70% height
-1.50
Speeds are uniform in the upper 30%
of the water column
-2.00
Total current (directions TOWARDS)
m/s
N
NE
100-yr
0.29
0.45
50-yr
0.29
0.44
10-yr
0.28
0.43
1-yr
0.27
0.41
1-yr monthly
Jan
0.24
0.39
Feb
0.24
0.39
Mar
0.22
0.37
Apr
0.20
0.35
May
0.18
0.34
Jun
0.17
0.32
Jul
0.15
0.30
Aug
0.17
0.32
Sep
0.20
0.35
Oct
0.20
0.35
Nov
0.22
0.37
Dec
0.24
0.39
E
0.29
0.29
0.28
0.27
SE
0.18
0.17
0.17
0.16
S
0.18
0.17
0.17
0.16
SW
0.45
0.44
0.43
0.41
W
0.29
0.29
0.28
0.27
Surface currents
NW
Non-dir
0.29
0.45
0.29
0.44
0.28
0.43
0.27
0.41
0.25
0.25
0.24
0.23
0.22
0.20
0.19
0.20
0.23
0.23
0.24
0.25
0.15
0.15
0.14
0.13
0.12
0.11
0.10
0.11
0.13
0.13
0.14
0.15
0.15
0.15
0.14
0.13
0.12
0.11
0.10
0.11
0.13
0.13
0.14
0.15
0.39
0.39
0.37
0.35
0.34
0.32
0.30
0.32
0.35
0.35
0.37
0.39
0.25
0.25
0.24
0.23
0.22
0.20
0.19
0.20
0.23
0.23
0.24
0.25
0.24
0.24
0.22
0.20
0.18
0.17
0.15
0.17
0.20
0.20
0.22
0.24
0.39
0.39
0.37
0.35
0.34
0.32
0.30
0.32
0.35
0.35
0.37
0.39
Total current (directions TOWARDS)
1 m above seabed
m/s
N
NE
E
SE
S
SW
W
NW
Non-dir
100-yr
0.23
0.36
0.23
0.14
0.14
0.36
0.23
0.23
0.36
50-yr
0.23
0.35
0.23
0.14
0.14
0.35
0.23
0.23
0.35
10-yr
0.22
0.34
0.22
0.13
0.13
0.34
0.22
0.22
0.34
1-yr
0.21
0.32
0.21
0.13
0.13
0.32
0.21
0.21
0.32
1-yr monthly
Jan
0.19
0.31
0.20
0.12
0.12
0.31
0.20
0.19
0.31
Feb
0.19
0.31
0.20
0.12
0.12
0.31
0.20
0.19
0.31
Mar
0.17
0.29
0.19
0.11
0.11
0.29
0.19
0.17
0.29
Apr
0.16
0.28
0.18
0.10
0.10
0.28
0.18
0.16
0.28
May
0.14
0.26
0.17
0.09
0.09
0.26
0.17
0.14
0.26
Jun
0.13
0.25
0.16
0.09
0.09
0.25
0.16
0.13
0.25
Jul
0.12
0.24
0.15
0.08
0.08
0.24
0.15
0.12
0.24
Aug
0.13
0.25
0.16
0.09
0.09
0.25
0.16
0.13
0.25
Sep
0.16
0.28
0.18
0.10
0.10
0.28
0.18
0.16
0.28
Oct
0.16
0.28
0.18
0.10
0.10
0.28
0.18
0.16
0.28
Nov
0.17
0.29
0.19
0.11
0.11
0.29
0.19
0.17
0.29
Dec
0.19
0.31
0.20
0.12
0.12
0.31
0.20
0.19
0.31
Notes
Storm surge currents from Proudman Continental Shelf Model; interpolated for spatial variation
Storm surge currents monthly scaling factors inferred from wave climate
Tidal currents from Metoc hydrodynamic model; combined tide-surge relationships empirical to nearest standard port
Table 3.1.7
Extreme Current Speeds at Wave Hub Cable - depth 8 m CD, approx kp 1.65
I:\P1209_JPKenny\R2056 metocean\Table 3.xls 3.1.7 09/04/2009 09:13
-2.00
-1.00
0.00
1.00
MIKE21 MSTC at
100-year depth
Joint tide & surge factor E50
MSTC not allowed to fall below
2.00
2.00
kp 1.85
18m
1.07
0.05
Newlyn
m/s
1.50
1.00
50 yr surge (depth-av)
0.2
Tide at 1 m asb
Max
Spring
Neap
m/s
0.19
0.15
0.06
MSTC
0.50
50yr surge
0.00
50yr total
-0.50
x 0.5m/s
m/s
-1.00
Current profile obeys 1/10th power law
between seabed and 70% height
-1.50
Speeds are uniform in the upper 30%
of the water column
-2.00
Total current (directions TOWARDS)
m/s
N
NE
100-yr
0.31
0.47
50-yr
0.30
0.47
10-yr
0.29
0.45
1-yr
0.28
0.43
1-yr monthly
Jan
0.25
0.41
Feb
0.25
0.41
Mar
0.23
0.39
Apr
0.21
0.37
May
0.19
0.35
Jun
0.17
0.33
Jul
0.15
0.31
Aug
0.17
0.33
Sep
0.21
0.37
Oct
0.21
0.37
Nov
0.23
0.39
Dec
0.25
0.41
E
0.29
0.28
0.28
0.26
SE
0.18
0.18
0.18
0.17
S
0.18
0.18
0.18
0.17
SW
0.47
0.47
0.45
0.43
W
0.29
0.28
0.28
0.26
Surface currents
NW
Non-dir
0.31
0.47
0.30
0.47
0.29
0.45
0.28
0.43
0.24
0.24
0.23
0.22
0.20
0.19
0.18
0.19
0.22
0.22
0.23
0.24
0.15
0.15
0.14
0.13
0.12
0.11
0.10
0.11
0.13
0.13
0.14
0.15
0.15
0.15
0.14
0.13
0.12
0.11
0.10
0.11
0.13
0.13
0.14
0.15
0.41
0.41
0.39
0.37
0.35
0.33
0.31
0.33
0.37
0.37
0.39
0.41
0.24
0.24
0.23
0.22
0.20
0.19
0.18
0.19
0.22
0.22
0.23
0.24
0.25
0.25
0.23
0.21
0.19
0.17
0.15
0.17
0.21
0.21
0.23
0.25
0.41
0.41
0.39
0.37
0.35
0.33
0.31
0.33
0.37
0.37
0.39
0.41
Total current (directions TOWARDS)
1 m above seabed
m/s
N
NE
E
SE
S
SW
W
NW
Non-dir
100-yr
0.24
0.37
0.22
0.14
0.14
0.37
0.22
0.24
0.37
50-yr
0.23
0.36
0.22
0.14
0.14
0.36
0.22
0.23
0.36
10-yr
0.23
0.35
0.21
0.14
0.14
0.35
0.21
0.23
0.35
1-yr
0.22
0.33
0.20
0.13
0.13
0.33
0.20
0.22
0.33
1-yr monthly
Jan
0.19
0.32
0.19
0.12
0.12
0.32
0.19
0.19
0.32
Feb
0.19
0.32
0.19
0.12
0.12
0.32
0.19
0.19
0.32
Mar
0.18
0.30
0.18
0.11
0.11
0.30
0.18
0.18
0.30
Apr
0.16
0.29
0.17
0.10
0.10
0.29
0.17
0.16
0.29
May
0.15
0.27
0.16
0.10
0.10
0.27
0.16
0.15
0.27
Jun
0.13
0.26
0.15
0.09
0.09
0.26
0.15
0.13
0.26
Jul
0.12
0.24
0.14
0.08
0.08
0.24
0.14
0.12
0.24
Aug
0.13
0.26
0.15
0.09
0.09
0.26
0.15
0.13
0.26
Sep
0.16
0.29
0.17
0.10
0.10
0.29
0.17
0.16
0.29
Oct
0.16
0.29
0.17
0.10
0.10
0.29
0.17
0.16
0.29
Nov
0.18
0.30
0.18
0.11
0.11
0.30
0.18
0.18
0.30
Dec
0.19
0.32
0.19
0.12
0.12
0.32
0.19
0.19
0.32
Notes
Storm surge currents from Proudman Continental Shelf Model; interpolated for spatial variation
Storm surge currents monthly scaling factors inferred from wave climate
Tidal currents from Metoc hydrodynamic model; combined tide-surge relationships empirical to nearest standard port
Table 3.1.8
Extreme Current Speeds at Wave Hub Cable - depth 10 m CD, approx kp 1.85
I:\P1209_JPKenny\R2056 metocean\Table 3.xls 3.1.8 09/04/2009 09:13
-2.00
-1.00
0.00
1.00
MIKE21 MSTC at
100-year depth
Joint tide & surge factor E50
MSTC not allowed to fall below
2.00
2.00
kp 2.15
20m
1.07
0.05
Newlyn
m/s
1.50
1.00
50 yr surge (depth-av)
0.3
Tide at 1 m asb
Max
Spring
Neap
m/s
0.20
0.16
0.06
MSTC
0.50
50yr surge
0.00
50yr total
-0.50
x 0.5m/s
m/s
-1.00
Current profile obeys 1/10th power law
between seabed and 70% height
-1.50
Speeds are uniform in the upper 30%
of the water column
-2.00
Total current (directions TOWARDS)
m/s
N
NE
100-yr
0.11
0.50
50-yr
0.11
0.49
10-yr
0.11
0.48
1-yr
0.10
0.45
1-yr monthly
Jan
0.10
0.43
Feb
0.10
0.43
Mar
0.09
0.41
Apr
0.09
0.39
May
0.09
0.37
Jun
0.08
0.35
Jul
0.08
0.33
Aug
0.08
0.35
Sep
0.09
0.39
Oct
0.09
0.39
Nov
0.09
0.41
Dec
0.10
0.43
E
0.28
0.28
0.27
0.25
SE
0.17
0.16
0.16
0.15
S
0.25
0.24
0.23
0.22
SW
0.50
0.49
0.48
0.45
W
0.28
0.28
0.27
0.25
Surface currents
NW
Non-dir
0.14
0.50
0.13
0.49
0.13
0.48
0.12
0.45
0.23
0.23
0.22
0.21
0.19
0.18
0.16
0.18
0.21
0.21
0.22
0.23
0.14
0.14
0.13
0.12
0.11
0.11
0.10
0.11
0.12
0.12
0.13
0.14
0.20
0.20
0.18
0.17
0.16
0.14
0.13
0.14
0.17
0.17
0.18
0.20
0.43
0.43
0.41
0.39
0.37
0.35
0.33
0.35
0.39
0.39
0.41
0.43
0.23
0.23
0.22
0.21
0.19
0.18
0.16
0.18
0.21
0.21
0.22
0.23
0.12
0.12
0.11
0.11
0.10
0.09
0.09
0.09
0.11
0.11
0.11
0.12
0.43
0.43
0.41
0.39
0.37
0.35
0.33
0.35
0.39
0.39
0.41
0.43
Total current (directions TOWARDS)
1 m above seabed
m/s
N
NE
E
SE
S
SW
W
NW
Non-dir
100-yr
0.08
0.39
0.22
0.13
0.19
0.39
0.22
0.10
0.39
50-yr
0.08
0.38
0.21
0.12
0.19
0.38
0.21
0.10
0.38
10-yr
0.08
0.37
0.21
0.12
0.18
0.37
0.21
0.10
0.37
1-yr
0.08
0.35
0.20
0.11
0.17
0.35
0.20
0.09
0.35
1-yr monthly
Jan
0.07
0.33
0.18
0.11
0.15
0.33
0.18
0.09
0.33
Feb
0.07
0.33
0.18
0.11
0.15
0.33
0.18
0.09
0.33
Mar
0.07
0.32
0.17
0.10
0.14
0.32
0.17
0.09
0.32
Apr
0.07
0.30
0.16
0.09
0.13
0.30
0.16
0.08
0.30
May
0.07
0.29
0.15
0.09
0.12
0.29
0.15
0.08
0.29
Jun
0.06
0.27
0.14
0.08
0.11
0.27
0.14
0.07
0.27
Jul
0.06
0.26
0.13
0.07
0.10
0.26
0.13
0.07
0.26
Aug
0.06
0.27
0.14
0.08
0.11
0.27
0.14
0.07
0.27
Sep
0.07
0.30
0.16
0.09
0.13
0.30
0.16
0.08
0.30
Oct
0.07
0.30
0.16
0.09
0.13
0.30
0.16
0.08
0.30
Nov
0.07
0.32
0.17
0.10
0.14
0.32
0.17
0.09
0.32
Dec
0.07
0.33
0.18
0.11
0.15
0.33
0.18
0.09
0.33
Notes
Storm surge currents from Proudman Continental Shelf Model; interpolated for spatial variation
Storm surge currents monthly scaling factors inferred from wave climate
Tidal currents from Metoc hydrodynamic model; combined tide-surge relationships empirical to nearest standard port
Table 3.1.9
Extreme Current Speeds at Wave Hub Cable - depth 12 m CD, approx kp 2.15
I:\P1209_JPKenny\R2056 metocean\Table 3.xls 3.1.9 09/04/2009 09:13
-2.00
-1.00
0.00
1.00
MIKE21 MSTC at
100-year depth
Joint tide & surge factor E50
MSTC not allowed to fall below
2.00
2.00
kp 3.5
23m
1.07
0.07
Newlyn
m/s
1.50
1.00
50 yr surge (depth-av)
0.3
Tide at 1 m asb
Max
Spring
Neap
m/s
0.30
0.24
0.11
MSTC
0.50
50yr surge
0.00
50yr total
-0.50
x 0.5m/s
m/s
-1.00
Current profile obeys 1/10th power law
between seabed and 70% height
-1.50
Speeds are uniform in the upper 30%
of the water column
-2.00
Total current (directions TOWARDS)
m/s
N
NE
100-yr
0.16
0.54
50-yr
0.16
0.53
10-yr
0.16
0.52
1-yr
0.15
0.49
1-yr monthly
Jan
0.14
0.44
Feb
0.14
0.44
Mar
0.14
0.41
Apr
0.13
0.38
May
0.12
0.35
Jun
0.12
0.32
Jul
0.11
0.29
Aug
0.12
0.32
Sep
0.13
0.38
Oct
0.13
0.38
Nov
0.14
0.41
Dec
0.14
0.44
E
0.65
0.64
0.62
0.59
SE
0.26
0.26
0.25
0.24
S
0.37
0.36
0.35
0.33
SW
0.54
0.53
0.52
0.49
W
0.65
0.64
0.62
0.59
Surface currents
NW
Non-dir
0.22
0.65
0.22
0.64
0.21
0.62
0.20
0.59
0.58
0.58
0.55
0.53
0.51
0.49
0.47
0.49
0.53
0.53
0.55
0.58
0.22
0.22
0.21
0.20
0.18
0.17
0.16
0.17
0.20
0.20
0.21
0.22
0.30
0.30
0.27
0.25
0.23
0.21
0.19
0.21
0.25
0.25
0.27
0.30
0.44
0.44
0.41
0.38
0.35
0.32
0.29
0.32
0.38
0.38
0.41
0.44
0.58
0.58
0.55
0.53
0.51
0.49
0.47
0.49
0.53
0.53
0.55
0.58
0.19
0.19
0.18
0.17
0.16
0.15
0.14
0.15
0.17
0.17
0.18
0.19
0.67
0.67
0.64
0.61
0.58
0.55
0.51
0.55
0.61
0.61
0.64
0.67
Total current (directions TOWARDS)
1 m above seabed
m/s
N
NE
E
SE
S
SW
W
NW
Non-dir
100-yr
0.12
0.41
0.50
0.20
0.28
0.41
0.50
0.17
0.50
50-yr
0.12
0.40
0.49
0.19
0.27
0.40
0.49
0.17
0.49
10-yr
0.12
0.39
0.47
0.19
0.26
0.39
0.47
0.16
0.47
1-yr
0.11
0.37
0.45
0.18
0.25
0.37
0.45
0.15
0.45
1-yr monthly
Jan
0.11
0.33
0.44
0.17
0.22
0.33
0.44
0.14
0.51
Feb
0.11
0.33
0.44
0.17
0.22
0.33
0.44
0.14
0.51
Mar
0.10
0.31
0.42
0.16
0.21
0.31
0.42
0.14
0.48
Apr
0.10
0.29
0.40
0.15
0.19
0.29
0.40
0.13
0.46
May
0.09
0.26
0.39
0.14
0.17
0.26
0.39
0.12
0.44
Jun
0.09
0.24
0.37
0.13
0.16
0.24
0.37
0.12
0.41
Jul
0.08
0.22
0.35
0.12
0.14
0.22
0.35
0.11
0.39
Aug
0.09
0.24
0.37
0.13
0.16
0.24
0.37
0.12
0.41
Sep
0.10
0.29
0.40
0.15
0.19
0.29
0.40
0.13
0.46
Oct
0.10
0.29
0.40
0.15
0.19
0.29
0.40
0.13
0.46
Nov
0.10
0.31
0.42
0.16
0.21
0.31
0.42
0.14
0.48
Dec
0.11
0.33
0.44
0.17
0.22
0.33
0.44
0.14
0.51
Notes
Storm surge currents from Proudman Continental Shelf Model; interpolated for spatial variation
Storm surge currents monthly scaling factors inferred from wave climate
Tidal currents from Metoc hydrodynamic model; combined tide-surge relationships empirical to nearest standard port
Table 3.1.10
Extreme Current Speeds at Wave Hub Cable - depth 15 m CD, approx kp 3.5
I:\P1209_JPKenny\R2056 metocean\Table 3.xls 3.1.10 09/04/2009 09:13
-2.00
-1.00
0.00
1.00
MIKE21 MSTC at
100-year depth
Joint tide & surge factor E50
MSTC not allowed to fall below
2.00
2.00
kp 4.3
28m
1.07
0.08
Newlyn
m/s
1.50
1.00
50 yr surge (depth-av)
0.4
Tide at 1 m asb
Max
Spring
Neap
m/s
0.46
0.36
0.14
MSTC
0.50
50yr surge
0.00
50yr total
-0.50
x 0.5m/s
m/s
-1.00
Current profile obeys 1/10th power law
between seabed and 70% height
-1.50
Speeds are uniform in the upper 30%
of the water column
-2.00
Total current (directions TOWARDS)
m/s
N
NE
100-yr
0.16
0.47
50-yr
0.15
0.46
10-yr
0.15
0.45
1-yr
0.14
0.43
1-yr monthly
Jan
0.14
0.39
Feb
0.14
0.39
Mar
0.13
0.37
Apr
0.13
0.34
May
0.12
0.32
Jun
0.12
0.30
Jul
0.12
0.27
Aug
0.12
0.30
Sep
0.13
0.34
Oct
0.13
0.34
Nov
0.13
0.37
Dec
0.14
0.39
E
0.88
0.86
0.83
0.79
SE
0.29
0.28
0.28
0.26
S
0.25
0.24
0.23
0.22
SW
0.47
0.46
0.45
0.43
W
0.88
0.86
0.83
0.79
Surface currents
NW
Non-dir
0.29
0.88
0.28
0.86
0.28
0.83
0.26
0.79
0.79
0.79
0.77
0.74
0.72
0.69
0.67
0.69
0.74
0.74
0.77
0.79
0.26
0.26
0.26
0.25
0.24
0.24
0.23
0.24
0.25
0.25
0.26
0.26
0.21
0.21
0.20
0.19
0.17
0.16
0.15
0.16
0.19
0.19
0.20
0.21
0.39
0.39
0.37
0.34
0.32
0.30
0.27
0.30
0.34
0.34
0.37
0.39
0.79
0.79
0.77
0.74
0.72
0.69
0.67
0.69
0.74
0.74
0.77
0.79
0.26
0.26
0.26
0.25
0.24
0.24
0.23
0.24
0.25
0.25
0.26
0.26
0.79
0.79
0.77
0.74
0.72
0.69
0.67
0.69
0.74
0.74
0.77
0.79
Total current (directions TOWARDS)
1 m above seabed
m/s
N
NE
E
SE
S
SW
W
NW
Non-dir
100-yr
0.12
0.35
0.65
0.22
0.18
0.35
0.65
0.22
0.65
50-yr
0.11
0.34
0.64
0.21
0.18
0.34
0.64
0.21
0.64
10-yr
0.11
0.33
0.62
0.20
0.17
0.33
0.62
0.20
0.62
1-yr
0.11
0.32
0.59
0.19
0.16
0.32
0.59
0.19
0.59
1-yr monthly
Jan
0.10
0.29
0.59
0.20
0.16
0.29
0.59
0.20
0.59
Feb
0.10
0.29
0.59
0.20
0.16
0.29
0.59
0.20
0.59
Mar
0.10
0.27
0.57
0.19
0.15
0.27
0.57
0.19
0.57
Apr
0.10
0.25
0.55
0.19
0.14
0.25
0.55
0.19
0.55
May
0.09
0.24
0.53
0.18
0.13
0.24
0.53
0.18
0.53
Jun
0.09
0.22
0.52
0.18
0.12
0.22
0.52
0.18
0.52
Jul
0.09
0.20
0.50
0.17
0.11
0.20
0.50
0.17
0.50
Aug
0.09
0.22
0.52
0.18
0.12
0.22
0.52
0.18
0.52
Sep
0.10
0.25
0.55
0.19
0.14
0.25
0.55
0.19
0.55
Oct
0.10
0.25
0.55
0.19
0.14
0.25
0.55
0.19
0.55
Nov
0.10
0.27
0.57
0.19
0.15
0.27
0.57
0.19
0.57
Dec
0.10
0.29
0.59
0.20
0.16
0.29
0.59
0.20
0.59
Notes
Storm surge currents from Proudman Continental Shelf Model; interpolated for spatial variation
Storm surge currents monthly scaling factors inferred from wave climate
Tidal currents from Metoc hydrodynamic model; combined tide-surge relationships empirical to nearest standard port
Table 3.1.11
Extreme Current Speeds at Wave Hub Cable - depth 20 m CD, approx kp 4.3
I:\P1209_JPKenny\R2056 metocean\Table 3.xls 3.1.11 09/04/2009 09:13
-2.00
-1.00
0.00
1.00
MIKE21 MSTC at
100-year depth
Joint tide & surge factor E50
MSTC not allowed to fall below
2.00
2.00
kp 10.0
31m
1.07
0.1
Newlyn
m/s
1.50
1.00
50 yr surge (depth-av)
0.5
Tide at 1 m asb
Max
Spring
Neap
m/s
0.86
0.67
0.31
MSTC
0.50
50yr surge
0.00
50yr total
-0.50
x 0.5m/s
m/s
-1.00
Current profile obeys 1/10th power law
between seabed and 70% height
-1.50
Speeds are uniform in the upper 30%
of the water column
-2.00
Total current (directions TOWARDS)
m/s
N
NE
100-yr
0.46
1.52
50-yr
0.45
1.49
10-yr
0.43
1.45
1-yr
0.41
1.37
1-yr monthly
Jan
0.38
1.36
Feb
0.38
1.36
Mar
0.36
1.32
Apr
0.34
1.28
May
0.32
1.24
Jun
0.30
1.19
Jul
0.28
1.15
Aug
0.30
1.19
Sep
0.34
1.28
Oct
0.34
1.28
Nov
0.36
1.32
Dec
0.38
1.36
E
1.46
1.43
1.39
1.32
SE
0.36
0.36
0.35
0.33
S
0.56
0.55
0.53
0.51
SW
1.52
1.49
1.45
1.37
W
1.52
1.49
1.45
1.37
Surface currents
NW
Non-dir
0.36
1.52
0.36
1.49
0.35
1.45
0.33
1.37
1.34
1.34
1.31
1.29
1.26
1.23
1.20
1.23
1.29
1.29
1.31
1.34
0.32
0.32
0.31
0.29
0.28
0.27
0.26
0.27
0.29
0.29
0.31
0.32
0.47
0.47
0.44
0.41
0.38
0.35
0.32
0.35
0.41
0.41
0.44
0.47
1.36
1.36
1.32
1.28
1.24
1.19
1.15
1.19
1.28
1.28
1.32
1.36
1.39
1.39
1.35
1.32
1.29
1.25
1.22
1.25
1.32
1.32
1.35
1.39
0.32
0.32
0.31
0.29
0.28
0.27
0.26
0.27
0.29
0.29
0.31
0.32
1.47
1.47
1.43
1.39
1.34
1.30
1.26
1.30
1.39
1.39
1.43
1.47
Total current (directions TOWARDS)
1 m above seabed
m/s
N
NE
E
SE
S
SW
W
NW
Non-dir
100-yr
0.34
1.12
1.07
0.27
0.41
1.12
1.12
0.27
1.12
50-yr
0.33
1.10
1.05
0.26
0.41
1.10
1.10
0.26
1.10
10-yr
0.32
1.06
1.02
0.26
0.39
1.06
1.06
0.26
1.06
1-yr
0.30
1.01
0.97
0.24
0.37
1.01
1.01
0.24
1.01
1-yr monthly
Jan
0.28
1.00
0.99
0.23
0.34
1.00
1.02
0.23
1.08
Feb
0.28
1.00
0.99
0.23
0.34
1.00
1.02
0.23
1.08
Mar
0.27
0.97
0.97
0.23
0.32
0.97
0.99
0.23
1.05
Apr
0.25
0.94
0.94
0.22
0.30
0.94
0.97
0.22
1.02
May
0.23
0.91
0.92
0.21
0.28
0.91
0.94
0.21
0.99
Jun
0.22
0.88
0.90
0.20
0.26
0.88
0.92
0.20
0.96
Jul
0.20
0.85
0.88
0.19
0.23
0.85
0.89
0.19
0.93
Aug
0.22
0.88
0.90
0.20
0.26
0.88
0.92
0.20
0.96
Sep
0.25
0.94
0.94
0.22
0.30
0.94
0.97
0.22
1.02
Oct
0.25
0.94
0.94
0.22
0.30
0.94
0.97
0.22
1.02
Nov
0.27
0.97
0.97
0.23
0.32
0.97
0.99
0.23
1.05
Dec
0.28
1.00
0.99
0.23
0.34
1.00
1.02
0.23
1.08
Notes
Storm surge currents from Proudman Continental Shelf Model; interpolated for spatial variation
Storm surge currents monthly scaling factors inferred from wave climate
Tidal currents from Metoc hydrodynamic model; combined tide-surge relationships empirical to nearest standard port
Table 3.1.12
Extreme Current Speeds at Wave Hub Cable - kp 10
I:\P1209_JPKenny\R2056 metocean\Table 3.xls 3.1.12 09/04/2009 09:13
-2.00
-1.00
0.00
1.00
MIKE21 MSTC at
100-year depth
Joint tide & surge factor E50
MSTC not allowed to fall below
2.00
2.00
kp 15.0
36m
1.07
0.1
Newlyn
m/s
1.50
1.00
50 yr surge (depth-av)
0.5
Tide at 1 m asb
Max
Spring
Neap
m/s
0.87
0.68
0.31
MSTC
0.50
50yr surge
0.00
50yr total
-0.50
x 0.5m/s
m/s
-1.00
Current profile obeys 1/10th power law
between seabed and 70% height
-1.50
Speeds are uniform in the upper 30%
of the water column
-2.00
Total current (directions TOWARDS)
m/s
N
NE
100-yr
0.50
1.68
50-yr
0.49
1.65
10-yr
0.48
1.60
1-yr
0.45
1.51
1-yr monthly
Jan
0.44
1.52
Feb
0.44
1.52
Mar
0.41
1.47
Apr
0.39
1.43
May
0.37
1.38
Jun
0.35
1.34
Jul
0.33
1.30
Aug
0.35
1.34
Sep
0.39
1.43
Oct
0.39
1.43
Nov
0.41
1.47
Dec
0.44
1.52
E
1.16
1.14
1.10
1.04
SE
0.35
0.35
0.34
0.32
S
0.62
0.61
0.59
0.56
SW
1.68
1.65
1.60
1.51
W
1.23
1.20
1.17
1.11
Surface currents
NW
Non-dir
0.35
1.68
0.35
1.65
0.34
1.60
0.32
1.51
1.05
1.05
1.02
0.99
0.96
0.93
0.90
0.93
0.99
0.99
1.02
1.05
0.30
0.30
0.29
0.27
0.26
0.25
0.23
0.25
0.27
0.27
0.29
0.30
0.52
0.52
0.49
0.46
0.43
0.40
0.37
0.40
0.46
0.46
0.49
0.52
1.52
1.52
1.47
1.43
1.38
1.34
1.30
1.34
1.43
1.43
1.47
1.52
1.09
1.09
1.06
1.02
0.99
0.95
0.92
0.95
1.02
1.02
1.06
1.09
0.30
0.30
0.29
0.27
0.26
0.25
0.23
0.25
0.27
0.27
0.29
0.30
1.52
1.52
1.47
1.43
1.38
1.34
1.30
1.34
1.43
1.43
1.47
1.52
Total current (directions TOWARDS)
1 m above seabed
m/s
N
NE
E
SE
S
SW
W
NW
Non-dir
100-yr
0.36
1.22
0.84
0.26
0.45
1.22
0.89
0.26
1.22
50-yr
0.36
1.19
0.82
0.25
0.44
1.19
0.87
0.25
1.19
10-yr
0.35
1.16
0.80
0.24
0.43
1.16
0.84
0.24
1.16
1-yr
0.33
1.10
0.76
0.23
0.41
1.10
0.80
0.23
1.10
1-yr monthly
Jan
0.32
1.10
0.76
0.22
0.38
1.10
0.79
0.22
1.10
Feb
0.32
1.10
0.76
0.22
0.38
1.10
0.79
0.22
1.10
Mar
0.30
1.07
0.74
0.21
0.36
1.07
0.77
0.21
1.07
Apr
0.28
1.03
0.72
0.20
0.33
1.03
0.74
0.20
1.03
May
0.27
1.00
0.69
0.19
0.31
1.00
0.72
0.19
1.00
Jun
0.25
0.97
0.67
0.18
0.29
0.97
0.69
0.18
0.97
Jul
0.24
0.94
0.65
0.17
0.27
0.94
0.67
0.17
0.94
Aug
0.25
0.97
0.67
0.18
0.29
0.97
0.69
0.18
0.97
Sep
0.28
1.03
0.72
0.20
0.33
1.03
0.74
0.20
1.03
Oct
0.28
1.03
0.72
0.20
0.33
1.03
0.74
0.20
1.03
Nov
0.30
1.07
0.74
0.21
0.36
1.07
0.77
0.21
1.07
Dec
0.32
1.10
0.76
0.22
0.38
1.10
0.79
0.22
1.10
Notes
Storm surge currents from Proudman Continental Shelf Model; interpolated for spatial variation
Storm surge currents monthly scaling factors inferred from wave climate
Tidal currents from Metoc hydrodynamic model; combined tide-surge relationships empirical to nearest standard port
Table 3.1.13
Extreme Current Speeds at Wave Hub Cable - kp 15
I:\P1209_JPKenny\R2056 metocean\Table 3.xls 3.1.13 09/04/2009 09:13
-2.00
-1.00
0.00
1.00
MIKE21 MSTC at
100-year depth
Joint tide & surge factor E50
MSTC not allowed to fall below
2.00
2.00
kp 20.0
41m
1.07
0.1
Newlyn
m/s
1.50
1.00
50 yr surge (depth-av)
0.5
Tide at 1 m asb
Max
Spring
Neap
m/s
0.93
0.73
0.35
MSTC
0.50
50yr surge
0.00
50yr total
-0.50
x 0.5m/s
m/s
-1.00
Current profile obeys 1/10th power law
between seabed and 70% height
-1.50
Speeds are uniform in the upper 30%
of the water column
-2.00
Total current (directions TOWARDS)
m/s
N
NE
100-yr
0.58
1.82
50-yr
0.57
1.79
10-yr
0.55
1.73
1-yr
0.53
1.64
1-yr monthly
Jan
0.50
1.65
Feb
0.50
1.65
Mar
0.47
1.60
Apr
0.45
1.55
May
0.43
1.50
Jun
0.40
1.46
Jul
0.38
1.41
Aug
0.40
1.46
Sep
0.45
1.55
Oct
0.45
1.55
Nov
0.47
1.60
Dec
0.50
1.65
E
1.08
1.05
1.02
0.97
SE
0.36
0.36
0.35
0.33
S
0.71
0.70
0.68
0.64
SW
1.82
1.79
1.73
1.64
W
1.13
1.11
1.07
1.02
Surface currents
NW
Non-dir
0.36
1.82
0.36
1.79
0.35
1.73
0.33
1.64
0.95
0.95
0.92
0.89
0.85
0.82
0.79
0.82
0.89
0.89
0.92
0.95
0.32
0.32
0.30
0.29
0.27
0.26
0.24
0.26
0.29
0.29
0.30
0.32
0.59
0.59
0.56
0.53
0.49
0.46
0.43
0.46
0.53
0.53
0.56
0.59
1.65
1.65
1.60
1.55
1.50
1.46
1.41
1.46
1.55
1.55
1.60
1.65
1.00
1.00
0.96
0.93
0.89
0.85
0.81
0.85
0.93
0.93
0.96
1.00
0.32
0.32
0.30
0.29
0.27
0.26
0.24
0.26
0.29
0.29
0.30
0.32
1.65
1.65
1.60
1.55
1.50
1.46
1.41
1.46
1.55
1.55
1.60
1.65
Total current (directions TOWARDS)
1 m above seabed
m/s
N
NE
E
SE
S
SW
W
NW
Non-dir
100-yr
0.42
1.30
0.77
0.26
0.51
1.30
0.81
0.26
1.30
50-yr
0.41
1.28
0.75
0.26
0.50
1.28
0.79
0.26
1.28
10-yr
0.40
1.24
0.73
0.25
0.48
1.24
0.77
0.25
1.24
1-yr
0.38
1.18
0.69
0.24
0.46
1.18
0.73
0.24
1.18
1-yr monthly
Jan
0.36
1.18
0.68
0.23
0.42
1.18
0.72
0.23
1.18
Feb
0.36
1.18
0.68
0.23
0.42
1.18
0.72
0.23
1.18
Mar
0.34
1.14
0.66
0.22
0.40
1.14
0.69
0.22
1.14
Apr
0.32
1.11
0.63
0.21
0.38
1.11
0.66
0.21
1.11
May
0.30
1.07
0.61
0.20
0.35
1.07
0.63
0.20
1.07
Jun
0.29
1.04
0.59
0.18
0.33
1.04
0.61
0.18
1.04
Jul
0.27
1.01
0.56
0.17
0.30
1.01
0.58
0.17
1.01
Aug
0.29
1.04
0.59
0.18
0.33
1.04
0.61
0.18
1.04
Sep
0.32
1.11
0.63
0.21
0.38
1.11
0.66
0.21
1.11
Oct
0.32
1.11
0.63
0.21
0.38
1.11
0.66
0.21
1.11
Nov
0.34
1.14
0.66
0.22
0.40
1.14
0.69
0.22
1.14
Dec
0.36
1.18
0.68
0.23
0.42
1.18
0.72
0.23
1.18
Notes
Storm surge currents from Proudman Continental Shelf Model; interpolated for spatial variation
Storm surge currents monthly scaling factors inferred from wave climate
Tidal currents from Metoc hydrodynamic model; combined tide-surge relationships empirical to nearest standard port
Table 3.1.14
Extreme Current Speeds at Wave Hub Cable - kp 20
I:\P1209_JPKenny\R2056 metocean\Table 3.xls 3.1.14 09/04/2009 09:13
-2.00
-1.00
0.00
1.00
MIKE21 MSTC at
100-year depth
Joint tide & surge factor E50
MSTC not allowed to fall below
2.00
2.00
kp 24.5
60m
1.07
0.15
Newlyn
m/s
1.50
1.00
50 yr surge (depth-av)
0.45
Tide at 1 m asb
Max
Spring
Neap
m/s
0.76
0.60
0.26
MSTC
0.50
50yr surge
0.00
50yr total
-0.50
x 0.5m/s
m/s
-1.00
Current profile obeys 1/10th power law
between seabed and 70% height
-1.50
Speeds are uniform in the upper 30%
of the water column
-2.00
Total current (directions TOWARDS)
m/s
N
NE
100-yr
0.53
1.48
50-yr
0.52
1.45
10-yr
0.51
1.41
1-yr
0.48
1.34
1-yr monthly
Jan
0.46
1.34
Feb
0.46
1.34
Mar
0.43
1.31
Apr
0.41
1.27
May
0.39
1.24
Jun
0.36
1.20
Jul
0.34
1.17
Aug
0.36
1.20
Sep
0.41
1.27
Oct
0.41
1.27
Nov
0.43
1.31
Dec
0.46
1.34
E
0.81
0.79
0.77
0.73
SE
0.49
0.48
0.47
0.44
S
0.69
0.67
0.65
0.62
SW
1.53
1.50
1.45
1.38
W
0.87
0.85
0.83
0.79
Surface currents
NW
Non-dir
0.34
1.53
0.33
1.50
0.32
1.45
0.30
1.38
0.73
0.73
0.71
0.69
0.66
0.64
0.62
0.64
0.69
0.69
0.71
0.73
0.40
0.40
0.38
0.36
0.33
0.31
0.29
0.31
0.36
0.36
0.38
0.40
0.57
0.57
0.54
0.50
0.47
0.43
0.40
0.43
0.50
0.50
0.54
0.57
1.38
1.38
1.34
1.30
1.27
1.23
1.19
1.23
1.30
1.30
1.34
1.38
0.77
0.77
0.74
0.72
0.69
0.66
0.64
0.66
0.72
0.72
0.74
0.77
0.29
0.29
0.28
0.26
0.25
0.24
0.23
0.24
0.26
0.26
0.28
0.29
1.38
1.38
1.34
1.30
1.27
1.23
1.19
1.23
1.30
1.30
1.34
1.38
Total current (directions TOWARDS)
1 m above seabed
m/s
N
NE
E
SE
S
SW
W
NW
Non-dir
100-yr
0.37
1.02
0.56
0.34
0.47
1.05
0.60
0.23
1.05
50-yr
0.36
1.00
0.55
0.33
0.46
1.03
0.59
0.23
1.03
10-yr
0.35
0.97
0.53
0.32
0.45
1.00
0.57
0.22
1.00
1-yr
0.33
0.92
0.50
0.30
0.43
0.95
0.54
0.21
0.95
1-yr monthly
Jan
0.31
0.92
0.50
0.28
0.39
0.95
0.53
0.20
0.95
Feb
0.31
0.92
0.50
0.28
0.39
0.95
0.53
0.20
0.95
Mar
0.30
0.90
0.49
0.26
0.37
0.92
0.51
0.19
0.92
Apr
0.28
0.88
0.47
0.25
0.35
0.90
0.49
0.18
0.90
May
0.27
0.85
0.46
0.23
0.32
0.87
0.47
0.17
0.87
Jun
0.25
0.83
0.44
0.21
0.30
0.84
0.46
0.17
0.84
Jul
0.23
0.80
0.42
0.20
0.27
0.82
0.44
0.16
0.82
Aug
0.25
0.83
0.44
0.21
0.30
0.84
0.46
0.17
0.84
Sep
0.28
0.88
0.47
0.25
0.35
0.90
0.49
0.18
0.90
Oct
0.28
0.88
0.47
0.25
0.35
0.90
0.49
0.18
0.90
Nov
0.30
0.90
0.49
0.26
0.37
0.92
0.51
0.19
0.92
Dec
0.31
0.92
0.50
0.28
0.39
0.95
0.53
0.20
0.95
Notes
Storm surge currents from Proudman Continental Shelf Model; interpolated for spatial variation
Storm surge currents monthly scaling factors inferred from wave climate
Tidal currents from Metoc hydrodynamic model; combined tide-surge relationships empirical to nearest standard port
Table 3.1.15
Extreme Current Speeds at Wave Hub Cable - kp 24.5 (hub end)
I:\P1209_JPKenny\R2056 metocean\Table 3.xls 3.1.15 09/04/2009 09:13
Seven Stones Light Vessel 50°6'9"N 6°6'0"W Sep 2001-Jan 2009
Hourly mean wind speed at anemometer height 14 m above still water level
m/s
Jan
Feb
Mar
Apr
May
Jun
0 to 2
71
44
78
76
68
102
2 to 4
184
264
364
605
505
673
4 to 6
428
452
534
845
966
1,073
6 to 8
661
657
741
902
1,035
1,048
8 to 10
855
710
758
974
877
837
10 to 12
905
723
819
635
708
467
12 to 14
948
681
665
436
472
164
14 to 16
692
504
459
267
228
59
16 to 18
381
236
167
84
97
27
18 to 20
307
143
132
60
64
8
20 to 22
103
61
57
17
23
5
22 to 24
70
14
23
3
3
24 to 26
14
4
8
1
1
26 to 28
2
7
28 to 30
2
30 to 32
1
32 to 34
1
34 to 36
1
Jul
186
633
1,164
1,163
807
477
258
100
17
10
2
1
Aug
60
526
1,037
1,126
867
567
239
63
9
3
4,818
4,498
1
Oct
99
481
707
860
884
794
476
327
156
86
24
15
9
3
1
Nov
147
361
593
773
838
798
619
352
193
102
63
17
1
5,390
4,922
4,858
36 to 38
38 to 40
-
Total
Table 4.1a
5,621
4,494
4,814
4,907
5,047
4,463
Wind speed at Wave Hub - Number Occurrence
I:\P1209_JPKenny\R2056 metocean\Table 4.1.xls T4.1 09/04/2009
Numbers Occurrence
Dec
Year
63
1,104
269
5,470
450
9,383
817
11,075
1,002
10,466
888
8,413
768
6,076
562
3,762
296
1,703
254
1,186
101
457
45
193
18
58
7
19
3
6
1
2
1
2
1
1
1
-
Sep
110
605
1,134
1,292
1,057
632
350
149
40
17
1
1
2
5,545
59,377
Seven Stones Light Vessel 50°6'9"N 6°6'0"W Sep 2001-Jan 2009
Hourly mean wind speed at anemometer height 14 m above still water level
m/s
Jan
Feb
Mar
Apr
May
Jun
>2
98.74
99.02
98.38
98.45
98.65
97.71
>4
95.46
93.15
90.82
86.12
88.65
82.63
>6
87.85
83.09
79.73
68.90
69.51
58.59
>8
76.09
68.47
64.33
50.52
49.00
35.11
> 10
60.88
52.67
48.59
30.67
31.62
16.36
> 12
44.78
36.58
31.57
17.73
17.59
5.89
> 14
27.91
21.43
17.76
8.84
8.24
2.22
> 16
15.60
10.21
8.23
3.40
3.72
0.90
> 18
8.82
4.96
4.76
1.69
1.80
0.29
> 20
3.36
1.78
2.01
0.47
0.53
0.11
> 22
1.53
0.42
0.83
0.12
0.08
> 24
0.28
0.11
0.35
0.06
0.02
> 26
0.04
0.02
0.19
0.04
> 28
0.02
0.04
0.04
> 30
0.02
0.04
> 32
0.02
0.02
> 34
0.02
> 36
> 38
> 40
-
Table 4.1b
Wind speed at Wave Hub - Percent Exceedence
I:\P1209_JPKenny\R2056 metocean\Table 4.1.xls T4.1 09/04/2009
Jul
96.14
83.00
58.84
34.70
17.95
8.05
2.70
0.62
0.27
0.06
0.02
-
Aug
98.67
86.97
63.92
38.88
19.61
7.00
1.69
0.29
0.09
0.02
0.02
-
Sep
97.96
86.73
65.70
41.73
22.12
10.39
3.90
1.13
0.39
0.07
0.06
0.04
-
Oct
97.99
88.22
73.85
56.38
38.42
22.29
12.62
5.97
2.80
1.06
0.57
0.26
0.08
0.02
-
Nov
96.97
89.54
77.34
61.42
44.17
27.75
15.01
7.76
3.79
1.69
0.39
0.04
0.02
0.02
0.02
0.02
-
Percent Exceedence
Dec
Year
98.86
98.14
94.01
88.93
85.90
73.13
71.16
54.47
53.09
36.85
37.08
22.68
23.23
12.45
13.09
6.11
7.75
3.24
3.17
1.24
1.35
0.47
0.54
0.15
0.22
0.05
0.09
0.02
0.04
0.01
0.02
0.01
0.02
0.00
0.02
0.00
0.02
0.00
-
100
90
>2
>4
>6
>8
> 10
> 12
> 14
> 16
> 18
> 20
> 22
> 24
> 26
> 28
> 30
> 32
80
Percent exceedence
70
60
50
40
30
20
10
0
Jan
Feb
Mar
Apr
May
Jun
Jul
Seven Stones Light Vessel 50°6'9"N 6°6'0"W Sep 2001-Jan 2009
Table 4.1c
Wind speed (m/s) at Wave Hub - Exceedence Curves
I:\P1209_JPKenny\R2056 metocean\Table 4.1.xls T4.1 09/04/2009
Aug
Sep
Oct
Nov
Dec
100 yr -ve swl
50 yr -ve swl
10 yr - ve swl
1 yr -ve swl
LAT
MLWS
MLWN
MSL
MHWN
MHWS
HAT
1 yr +ve swl
10 yr +ve swl
50 yr +ve swl
100 yr +ve swl
50 yr total
100 yr total
Wave Hub
30
Water level, m LAT
25
Extreme wave crests coincide
with SWL of same return
period
20
15
10
maximum still water level
mean sea (still water) level
5
Astronomical
tide range
0
minimum still water level
Dated 10 March 2009
100 yr total
50 yr total
100 yr +ve swl
50 yr +ve swl
10 yr +ve swl
1 yr +ve swl
HAT
MHWS
MHWN
MSL
MLWN
MLWS
LAT
1 yr -ve swl
10 yr - ve swl
50 yr -ve swl
100 yr -ve swl
m LAT
24.8
24.0
8.3
8.2
8.1
7.9
7.3
6.8
5.5
4.1
2.7
1.0
0.0
0.5
0.3
0.2
0.1
m msl
20.7
19.9
4.2
4.1
4.0
3.8
3.2
2.7
1.4
0.0
-1.4
-3.1
-4.1
-3.6
-3.8
-3.9
-4.0
16.5 m
15.8 m
100-yr crest
50-yr crest
n yrs
100
50
10
1
surge
1.1 m
1.0 m
0.9 m
0.7 m
Refs
surge - CSM model at sites surrounding the wave hub
sta - CS20 model at wave hub
NP 201 Adm Tide Tables Vol 1 (UK & Ireland) 2008:
Table V - Heights at Plymouth
Part III - M2 and S2 heights at Plymouth
Offshore Technology Report OTO 2001/010
"Environmental Considerations"
(tide-surge combination and n-year levels)
Tidal heights scaled from standard port to site
in the ratio of their tidal (M2+S2) amplitudes
LAT is lower than the n-year extremes
Table 5.1
Tide and extreme still water levels at Wave Hub (KP 24.5)
I:\P1209_JPKenny\R2056 metocean\Table 5.xls T5.1
09/04/2009
100 yr -ve swl
50 yr -ve swl
10 yr - ve swl
1 yr -ve swl
LAT
MLWS
MLWN
MSL
MHWN
MHWS
HAT
1 yr +ve swl
10 yr +ve swl
50 yr +ve swl
100 yr +ve swl
50 yr total
100 yr total
Shore end
16
14
Water level, m LAT
12
Extreme wave crests coincide
with SWL of same return
period
10
maximum still water level
8
mean sea (still water) level
6
Astronomical
tide range
4
2
0
minimum still water level
Dated 7 April 2009
100 yr total
50 yr total
100 yr +ve swl
50 yr +ve swl
10 yr +ve swl
1 yr +ve swl
HAT
MHWS
MHWN
MSL
MLWN
MLWS
LAT
1 yr -ve swl
10 yr - ve swl
50 yr -ve swl
100 yr -ve swl
m LAT
14.2
14.1
8.6
8.5
8.4
8.2
7.7
7.2
5.7
4.3
2.9
1.0
0.0
0.6
0.4
0.3
0.2
m msl
9.9
9.8
4.3
4.2
4.1
3.9
3.4
2.9
1.4
0.0
-1.4
-3.3
-4.3
-3.7
-3.9
-4.0
-4.1
5.6 m
5.6 m
100-yr crest
50-yr crest
n yrs
100
50
10
1
surge
1.1 m
1.0 m
0.9 m
0.7 m
Refs
surge - CSM model at sites surrounding the wave hub
sta - CS20 model at wave hub
NP 201 Adm Tide Tables Vol 1 (UK & Ireland) 2008:
Table V - Heights at Plymouth
Part III - M2 and S2 heights at Plymouth
Offshore Technology Report OTO 2001/010
"Environmental Considerations"
(tide-surge combination and n-year levels)
Tidal heights scaled from standard port to site
in the ratio of their tidal (M2+S2) amplitudes
LAT is lower than the n-year extremes
Table 5.2
Tide and extreme still water levels near shore end (KP 1.25)
I:\P1209_JPKenny\R2056 metocean\Table 5.xls T5.2
09/04/2009
Temp °C
0
5
10
15
20
25
0m
20 m
40 m
60 m
80 m
100 m
120 m
140 m
Salinity psu
32.5
0m
20 m
40 m
60 m
80 m
100 m
120 m
140 m
33
33.5
34
34.5
35
35.5
36
Density kg.m-3
1024.5
0m
20 m
40 m
60 m
80 m
100 m
120 m
140 m
1025.0
1025.5
1026.0
1026.5
1027.0
1027.5
SW Wave Hub Shore Export Cable
Based on 12,759 CTD and bottle data collected 1901-2007 in area 49-51°N 5-7°W
(Observed data source International Council for Exploration of the Sea)
Table 6.1 Seawater properties with depth
I:\P1209_JPKenny\R2056 metocean\Table 6.xls T6 09/04/2009 16:00
1028.0
Temp °C
25
20
15
10
5
0
1 Jan
2 Mar
2 May
2 Jul
1 Sep
1 Nov
1 Sep
1 Nov
1 Sep
1 Nov
Salinity psu
36
35.5
35
34.5
34
33.5
33
32.5
1 Jan
2 Mar
2 May
2 Jul
Density kg.m-3
1028.0
1027.5
1027.0
1026.5
1026.0
1025.5
1025.0
1024.5
1 Jan
2 Mar
2 May
2 Jul
SW Wave Hub Shore Export Cable
Based on 12,759 CTD and bottle data collected 1901-2007 in area 49-51°N 5-7°W
(Observed data source International Council for Exploration of the Sea)
Table 6.2 Seawater properties by month
I:\P1209_JPKenny\R2056 metocean\Table 6.xls T6 09/04/2009 16:00
0-29 m
30-64 m
65 m +
Jan
12.0
11.0
12.0
Feb
11.2
10.7
10.6
Mar
10.2
10.2
10.2
Apr
11.3
11.0
10.6
May
13.6
12.0
11.4
Jun
17.0
16.0
13.0
Jul
18.5
15.8
16.0
Aug
20.6
17.1
13.4
Sep
18.4
16.3
14.5
Oct
17.0
15.2
13.0
Maximum
Nov Dec
14.1 12.4
14.1 14.1
14.2 12.5
25°C
20°C
0-29 m
15°C
30-64 m
65 m +
10°C
5°C
Jan
0-29 m
30-64 m
65 m +
Feb
Jan
10.4
10.3
10.4
Mar
Apr
Feb
10.1
10.2
10.2
Mar
9.5
9.6
9.6
May
Apr
10.1
10.0
10.1
Jun
May
11.2
10.5
10.5
Jul
Aug
Jun
13.0
11.1
11.2
Sep
Jul
14.5
11.7
11.2
Oct
Aug
15.4
12.2
11.2
Nov
Sep
14.2
12.3
11.5
Dec
Oct
12.9
11.8
11.1
Average
Nov Dec
12.5 11.8
12.4 11.9
12.0 11.8
25°C
20°C
0-29 m
15°C
30-64 m
65 m +
10°C
5°C
Jan
0-29 m
30-64 m
65 m +
Feb
Jan
9.1
9.1
9.6
Mar
Feb
8.9
9.0
9.0
Apr
Mar
7.7
7.7
8.5
May
Apr
8.2
8.2
8.7
Jun
Jul
May
9.2
8.7
7.9
Aug
Jun
9.4
8.6
8.7
Sep
Jul
11.0
9.3
9.1
Oct
Aug
10.8
9.3
9.3
Nov
Sep
10.7
9.8
9.5
Dec
Oct
12.2
10.7
10.6
Minimum
Nov Dec
10.8 10.1
10.1
9.9
10.1 10.3
25°C
20°C
0-29 m
15°C
30-64 m
65 m +
10°C
5°C
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Table 6.3 Seawater temperature by month
I:\P1209_JPKenny\R2056 metocean\Table 6.xls T6 09/04/2009 16:00
Sep
Oct
Nov
Dec
JP KENNY
SW WAVE HUB - METOCEAN DESIGN BASIS
Appendix A Extreme Waves by Month
REPORT NO: 2056, REV 0
FILENAME: P1209A / TMAR50.DOC
A-1
29/04/2009
Hs (m) at KP 24.5
Hs (m) at KP 15
N
N
NW
NE
10
15
NE
10
NW
5
5
W
N
15
15
NW
Hs (m) at KP 1.5
0
E
SW
SE
W
5
E
0
SW
SE
S
W
SW
SE
S
0.78 H/d breaking limit
Extreme significant wave height, Hs (m)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
4.4
4.6
4.7
4.8
4.9
4.9
5.0
5.2
5.4
5.7
6.0
9.7
10.4
9.5
10.2
N
3.6
3.6
3.7
3.7
3.7
3.7
3.7
3.7
3.7
4.1
4.3
4.3
4.4
4.4
4.5
1-year January
NE
1.2
1.2
1.2
1.2
1.2
1.3
1.3
1.3
1.4
2.3
3.0
3.6
3.6
3.6
3.7
E
0.4
0.4
0.4
0.4
0.5
0.5
0.5
0.6
0.6
1.0
1.3
1.8
2.1
2.3
2.4
SE
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.3
0.6
0.7
1.1
1.3
1.5
1.7
S
0.2
0.2
0.3
0.3
0.3
0.3
0.3
0.3
0.4
0.8
0.9
1.2
1.8
2.1
2.3
E
2.0
2.1
2.1
2.2
2.2
2.3
2.4
2.5
2.7
3.7
4.1
4.8
5.0
5.3
5.4
SE
1.3
1.4
1.4
1.4
1.4
1.5
1.5
1.6
1.7
2.5
2.8
3.5
3.9
4.2
4.4
S
SW
W
NW
1.6
2.3
4.7
7.6
1.7
2.3
4.8
7.8
1.7
2.4
4.8
7.9
1.7
2.4
4.8
8.0
1.8
2.4
4.8
8.0
1.8
2.5
4.9
8.0
1.8
2.5
5.0
8.0
2.0
2.6
5.0
8.0
2.1
2.9
5.2
8.0
2.9
3.9
10.5
8.1
3.1
4.5
10.5
8.1
3.7
10.2
10.5
8.2
4.6
10.2
11.1
8.2
5.0
10.3
11.4
8.2
5.2
10.3
11.5
8.3
Prepared by Metoc plc 1 April 2009
Mean zero-upcrossing wave period Tz (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
7.6
7.8
7.9
8.0
8.0
8.0
8.0
8.0
8.0
8.1
8.1
10.5
11.1
11.4
11.5
E
0
S
8 m Still water level above CD
NE
10
N
6.9
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.1
7.1
7.2
7.2
7.2
7.2
NE
4.4
4.4
4.3
4.3
4.3
4.3
4.3
4.3
4.2
6.4
6.4
6.5
6.5
6.5
6.5
SW
0.5
0.6
0.6
0.6
0.6
0.6
0.7
0.7
0.8
1.1
1.4
3.4
6.4
7.5
7.7
W
1.5
1.5
1.5
1.5
1.6
1.6
1.7
1.7
1.8
4.9
5.4
9.7
10.4
9.5
10.2
NW
4.4
4.6
4.7
4.8
4.9
4.9
5.0
5.2
5.4
5.7
6.0
5.5
5.6
5.8
5.9
1-year January
SW Wave Hub Shore Export Cable - Metocean Design Basis
Table A1 Wave criteria - Return Period 1 year - January
I:\P1209_JPKenny\R2056 metocean\App A.xls jan 09/04/2009 09:44
p 1 of 3
8 m Still water level above CD
0.78 H/d breaking limit
Period of peak spectral energy Tp (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
9.7
9.9
10.0
10.1
10.1
10.2
10.2
10.2
10.2
10.3
10.3
13.3
14.1
14.5
14.7
N
8.8
8.9
8.9
8.9
8.9
8.9
8.9
8.9
8.9
9.0
9.0
9.1
9.1
9.1
9.1
1-year January
NE
5.6
5.5
5.5
5.5
5.5
5.5
5.5
5.4
5.4
8.2
8.2
8.2
8.3
8.3
8.3
E
2.6
2.7
2.7
2.8
2.9
3.0
3.0
3.2
3.5
4.7
5.2
6.1
6.4
6.7
6.8
SE
1.7
1.7
1.8
1.8
1.8
1.9
1.9
2.0
2.2
3.2
3.6
4.4
5.0
5.3
5.6
S
2.1
2.1
2.2
2.2
2.2
2.3
2.3
2.5
2.7
3.6
3.9
4.7
5.8
6.3
6.6
SW
2.9
2.9
3.0
3.0
3.1
3.1
3.2
3.3
3.6
5.0
5.8
12.9
13.0
13.0
13.1
SE
0.3
0.3
0.4
0.4
0.4
0.4
0.4
0.5
0.6
1.1
1.4
2.1
2.7
3.0
3.3
S
0.5
0.5
0.5
0.5
0.6
0.6
0.6
0.7
0.8
1.6
1.9
2.4
3.5
4.2
4.6
SW
1.1
1.2
1.2
1.2
1.3
1.3
1.4
1.4
1.6
2.2
2.7
6.3
11.9
14.1
14.4
Maximum wave height in a 3-hour sea state Hmax (m)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
7.0
7.8
8.6
9.1
9.2
9.3
9.5
9.9
10.3
10.8
11.4
18.0
19.3
17.7
18.9
N
6.9
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.1
7.9
8.2
8.2
8.4
8.4
8.5
NE
2.3
2.3
2.3
2.4
2.4
2.5
2.5
2.7
2.8
4.4
5.7
6.9
6.9
7.0
7.1
E
0.8
0.9
0.9
0.9
1.0
1.0
1.0
1.1
1.2
2.0
2.5
3.6
4.1
4.5
4.7
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
8.0
8.2
8.3
8.3
8.4
8.4
8.4
8.4
8.4
8.5
8.5
11.0
11.7
12.0
12.1
N
7.3
7.3
7.3
7.4
7.4
7.4
7.4
7.4
7.4
7.4
7.5
7.5
7.5
7.5
7.5
NE
4.6
4.6
4.6
4.6
4.5
4.5
4.5
4.5
4.4
6.8
6.8
6.8
6.8
6.8
6.8
E
2.1
2.2
2.3
2.3
2.4
2.5
2.5
2.7
2.9
3.9
4.3
5.1
5.3
5.6
5.6
NW
9.7
9.9
10.0
10.1
10.1
10.2
10.2
10.2
10.2
10.3
10.3
10.4
10.5
10.5
10.5
1-year January
Period associated with max wave height - lower limit of Tmax (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
W
6.0
6.1
6.1
6.1
6.2
6.2
6.3
6.4
6.5
13.4
13.4
13.3
14.1
14.5
14.7
SE
1.4
1.4
1.5
1.5
1.5
1.5
1.6
1.7
1.8
2.6
3.0
3.6
4.1
4.4
4.6
W
2.9
3.0
3.0
3.0
3.1
3.1
3.3
3.4
3.6
9.1
10.1
18.0
19.3
17.7
18.9
NW
7.0
7.8
8.6
9.1
9.2
9.3
9.5
9.9
10.3
10.8
11.4
10.5
10.6
11.0
11.1
1-year January
S
SW
W
NW
1.7
2.4
5.0
8.0
1.7
2.4
5.0
8.2
1.8
2.5
5.0
8.3
1.8
2.5
5.1
8.3
1.8
2.5
5.1
8.4
1.9
2.6
5.1
8.4
1.9
2.6
5.2
8.4
2.1
2.7
5.3
8.4
2.3
3.0
5.4
8.4
3.0
4.1
11.1
8.5
3.2
4.8
11.1
8.5
3.9
10.7
11.0
8.6
4.8
10.7
11.7
8.6
5.2
10.8
12.0
8.7
5.5
10.8
12.1
8.7
Prepared by Metoc plc 1 April 2009
SW Wave Hub Shore Export Cable - Metocean Design Basis
Table A1 Wave criteria - Return Period 1 year - January
I:\P1209_JPKenny\R2056 metocean\App A.xls jan 09/04/2009 09:44
p 2 of 3
8 m Still water level above CD
0.78 H/d breaking limit
Period associated with max wave height - upper limit of Tmax (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
10.7
10.9
11.1
11.1
11.2
11.2
11.2
11.2
11.3
11.4
11.4
14.7
15.6
16.0
16.2
N
9.7
9.8
9.8
9.8
9.8
9.8
9.8
9.8
9.8
9.9
10.0
10.0
10.0
10.0
10.0
1-year January
NE
6.1
6.1
6.1
6.1
6.0
6.0
6.0
6.0
5.9
9.0
9.0
9.1
9.1
9.1
9.1
E
2.8
2.9
3.0
3.1
3.1
3.3
3.3
3.6
3.8
5.1
5.7
6.8
7.1
7.4
7.5
SE
1.9
1.9
1.9
2.0
2.0
2.0
2.1
2.2
2.4
3.5
4.0
4.8
5.5
5.9
6.2
S
2.3
2.3
2.4
2.4
2.5
2.5
2.6
2.7
3.0
4.0
4.3
5.2
6.4
6.9
7.3
SW
3.2
3.2
3.3
3.3
3.4
3.4
3.5
3.6
4.0
5.5
6.4
14.3
14.3
14.4
14.4
NE
1.0
1.0
1.0
1.0
1.1
1.1
1.2
1.5
1.8
1.0
1.3
2.1
2.1
2.2
2.2
E
2.8
2.7
2.6
2.6
2.5
2.4
2.3
2.1
1.9
1.5
1.5
1.7
2.0
1.9
2.0
SE
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.3
2.3
2.4
2.3
2.2
2.2
S
SW
W
NW
2.2
3.6
1.0
1.6
2.2
3.6
1.1
1.6
2.2
3.5
1.1
1.6
2.2
3.5
1.1
1.6
2.2
3.5
1.1
1.6
2.2
3.5
1.1
1.6
2.2
3.5
1.1
1.7
2.2
3.3
1.2
1.8
2.2
2.6
1.2
2.0
3.0
1.4
1.0
2.2
2.9
1.1
1.0
2.4
2.2
1.0
2.3
1.9
2.2
1.0
2.1
1.9
2.2
1.3
1.4
2.1
2.2
1.4
1.6
2.2
Prepared by Metoc plc 1 April 2009
Spectral peakedness parameter gamma
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
1.6
1.6
1.6
1.6
1.6
1.6
1.7
1.8
2.0
2.2
2.4
2.3
2.1
1.4
1.6
N
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.9
2.1
2.0
2.1
2.1
2.2
W
6.6
6.7
6.7
6.8
6.8
6.8
6.9
7.0
7.2
14.7
14.8
14.7
15.6
16.0
16.2
NW
10.7
10.9
11.1
11.1
11.2
11.2
11.2
11.2
11.3
11.4
11.4
11.5
11.5
11.5
11.6
1-year January
SW Wave Hub Shore Export Cable - Metocean Design Basis
Notes
Intended for use in engineering design of seabed cable
Extreme Hs and Tz are generated by wave refraction model MIKE21
The model calculates the transformation to shore of extreme waves input at its offshore boundary
For waves moving offshore (e.g. from east) it calculates wind-generated wave growth
Other wave parameters are derived from Hs and Tz using industry-standard relationships:
Tp = 1.27*Tz
Hmax is calculated from Hs and Tz for 3 hr storm duration according to Rayleigh theory; limited to 0.78 depth
Lower Tmax/Tz ratio 1.05; Upper Tmax/Tz ratio 1.40; Central Tmax is same as Tp
Gamma derived fron Hs, Tp using formulation given in offshore standard DNV-OS-J101
Wave boundary inputs calculated from European Wave Model at 50.7°N 5.7°W Nov 1988 - Nov 2008
European model data (joint frequency tables) purchased under licence from UK Met Office
Wind inputs calculated from Seven Stones Light Vessel observations 50°6'9"N 6°6'0"W Sep 2001 - Jan 2009
Table A1 Wave criteria - Return Period 1 year - January
I:\P1209_JPKenny\R2056 metocean\App A.xls jan 09/04/2009 09:44
p 3 of 3
Hs (m) at KP 24.5
Hs (m) at KP 15
N
N
NW
NE
10
15
NE
10
NW
5
5
W
N
15
15
NW
Hs (m) at KP 1.5
0
E
SW
SE
W
5
E
0
SW
SE
S
W
SW
SE
S
0.78 H/d breaking limit
Extreme significant wave height, Hs (m)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
4.3
4.5
4.6
4.6
4.7
4.7
4.8
5.0
5.2
5.5
5.7
9.6
10.2
9.3
9.9
N
3.4
3.5
3.5
3.5
3.5
3.5
3.5
3.5
3.6
3.9
4.1
4.1
4.2
4.2
4.2
1-year February
NE
1.2
1.2
1.2
1.2
1.2
1.3
1.3
1.4
1.4
2.3
3.0
3.6
3.6
3.7
3.7
E
0.3
0.3
0.4
0.4
0.4
0.5
0.5
0.5
0.6
1.0
1.2
1.8
2.1
2.3
2.4
SE
0.1
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.3
0.6
0.7
1.1
1.4
1.7
1.8
S
0.2
0.2
0.2
0.2
0.3
0.3
0.3
0.3
0.4
0.8
0.9
1.2
1.7
2.1
2.3
E
1.9
2.0
2.0
2.1
2.2
2.3
2.3
2.5
2.7
3.7
4.1
4.7
5.0
5.3
5.3
SE
1.3
1.3
1.3
1.4
1.4
1.4
1.5
1.6
1.7
2.4
2.8
3.6
4.0
4.4
4.6
S
SW
W
NW
1.6
2.2
4.8
7.6
1.6
2.2
4.8
7.7
1.7
2.3
4.8
7.8
1.7
2.3
4.8
7.8
1.7
2.3
4.9
7.8
1.7
2.4
4.9
7.9
1.8
2.4
5.0
7.9
1.9
2.5
5.0
7.9
2.1
2.8
5.2
7.9
2.9
3.9
10.5
7.9
3.0
4.4
10.5
8.0
3.7
9.9
10.4
8.0
4.5
9.9
11.0
8.0
4.9
9.9
11.3
8.1
5.2
9.9
11.4
8.1
Prepared by Metoc plc 1 April 2009
Mean zero-upcrossing wave period Tz (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
7.6
7.7
7.8
7.8
7.8
7.9
7.9
7.9
7.9
7.9
8.0
10.4
11.0
11.3
11.4
E
0
S
8 m Still water level above CD
NE
10
N
6.8
6.8
6.8
6.8
6.8
6.8
6.8
6.9
6.9
6.9
6.9
7.0
7.0
7.0
7.0
NE
4.4
4.4
4.4
4.3
4.3
4.3
4.3
4.3
4.2
6.5
6.5
6.5
6.5
6.5
6.5
SW
0.5
0.5
0.5
0.6
0.6
0.6
0.6
0.7
0.7
1.1
1.3
3.1
5.9
6.9
7.2
W
1.5
1.5
1.5
1.6
1.6
1.6
1.7
1.7
1.8
4.8
5.3
9.6
10.2
9.3
9.9
NW
4.3
4.5
4.6
4.6
4.7
4.7
4.8
5.0
5.2
5.5
5.7
5.3
5.4
5.6
5.6
1-year February
SW Wave Hub Shore Export Cable - Metocean Design Basis
Table A2 Wave criteria - Return Period 1 year - February
I:\P1209_JPKenny\R2056 metocean\App A.xls feb 09/04/2009 09:44
p 1 of 3
8 m Still water level above CD
0.78 H/d breaking limit
Period of peak spectral energy Tp (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
9.6
9.8
9.9
9.9
10.0
10.0
10.0
10.0
10.0
10.1
10.1
13.3
14.0
14.3
14.5
N
8.6
8.7
8.7
8.7
8.7
8.7
8.7
8.7
8.7
8.8
8.8
8.8
8.9
8.9
8.9
1-year February
NE
5.6
5.6
5.5
5.5
5.5
5.5
5.5
5.4
5.4
8.2
8.2
8.3
8.3
8.3
8.3
E
2.4
2.5
2.6
2.7
2.8
2.9
3.0
3.2
3.4
4.7
5.2
6.0
6.4
6.7
6.8
SE
1.6
1.7
1.7
1.7
1.8
1.8
1.9
2.0
2.2
3.1
3.5
4.5
5.1
5.5
5.8
S
2.0
2.1
2.1
2.1
2.2
2.2
2.3
2.4
2.6
3.6
3.8
4.7
5.7
6.2
6.6
SW
2.8
2.8
2.9
2.9
3.0
3.0
3.1
3.2
3.5
4.9
5.6
12.5
12.5
12.6
12.6
SE
0.3
0.3
0.3
0.3
0.4
0.4
0.4
0.4
0.5
1.2
1.5
2.3
2.9
3.3
3.6
S
0.5
0.5
0.5
0.5
0.5
0.6
0.6
0.7
0.8
1.6
1.8
2.3
3.4
4.1
4.5
SW
1.1
1.1
1.1
1.2
1.2
1.2
1.3
1.3
1.5
2.1
2.5
5.7
11.1
13.0
13.5
Maximum wave height in a 3-hour sea state Hmax (m)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
7.0
7.8
8.6
8.8
8.9
9.0
9.2
9.5
9.9
10.4
10.9
17.9
19.0
17.2
18.4
N
6.6
6.7
6.7
6.7
6.7
6.7
6.7
6.8
6.8
7.5
7.8
7.8
8.0
8.0
8.1
NE
2.3
2.3
2.4
2.4
2.5
2.5
2.5
2.7
2.8
4.5
5.7
7.0
7.0
7.0
7.1
E
0.7
0.7
0.8
0.8
0.9
0.9
1.0
1.1
1.2
2.0
2.5
3.6
4.1
4.4
4.7
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
7.9
8.1
8.2
8.2
8.2
8.3
8.3
8.3
8.3
8.3
8.4
11.0
11.6
11.8
11.9
N
7.1
7.2
7.2
7.2
7.2
7.2
7.2
7.2
7.2
7.2
7.3
7.3
7.3
7.3
7.3
NE
4.6
4.6
4.6
4.6
4.5
4.5
4.5
4.5
4.5
6.8
6.8
6.8
6.8
6.8
6.8
E
1.9
2.1
2.1
2.2
2.3
2.4
2.5
2.7
2.8
3.9
4.3
4.9
5.3
5.6
5.6
NW
9.6
9.8
9.9
9.9
10.0
10.0
10.0
10.0
10.0
10.1
10.1
10.2
10.2
10.2
10.2
1-year February
Period associated with max wave height - lower limit of Tmax (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
W
6.0
6.1
6.1
6.1
6.2
6.2
6.3
6.4
6.6
13.3
13.3
13.3
14.0
14.3
14.5
SE
1.4
1.4
1.4
1.4
1.5
1.5
1.5
1.6
1.8
2.6
2.9
3.7
4.2
4.6
4.8
W
2.9
3.0
3.0
3.1
3.1
3.1
3.3
3.4
3.6
8.9
10.0
17.9
19.0
17.2
18.4
NW
7.0
7.8
8.6
8.8
8.9
9.0
9.2
9.5
9.9
10.4
10.9
10.1
10.2
10.6
10.7
1-year February
S
SW
W
NW
1.7
2.3
5.0
7.9
1.7
2.3
5.0
8.1
1.7
2.4
5.1
8.2
1.8
2.4
5.1
8.2
1.8
2.5
5.1
8.2
1.8
2.5
5.1
8.3
1.9
2.5
5.2
8.3
2.0
2.6
5.3
8.3
2.2
2.9
5.4
8.3
3.0
4.1
11.0
8.3
3.2
4.6
11.0
8.4
3.9
10.3
11.0
8.4
4.7
10.4
11.6
8.5
5.2
10.4
11.8
8.5
5.4
10.4
11.9
8.5
Prepared by Metoc plc 1 April 2009
SW Wave Hub Shore Export Cable - Metocean Design Basis
Table A2 Wave criteria - Return Period 1 year - February
I:\P1209_JPKenny\R2056 metocean\App A.xls feb 09/04/2009 09:44
p 2 of 3
8 m Still water level above CD
0.78 H/d breaking limit
Period associated with max wave height - upper limit of Tmax (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
10.6
10.8
10.9
11.0
11.0
11.0
11.0
11.0
11.1
11.1
11.2
14.6
15.4
15.8
15.9
N
9.5
9.6
9.6
9.6
9.6
9.6
9.6
9.6
9.6
9.7
9.7
9.7
9.8
9.8
9.8
1-year February
NE
6.1
6.1
6.1
6.1
6.1
6.0
6.0
6.0
5.9
9.0
9.0
9.1
9.1
9.1
9.1
E
2.6
2.7
2.8
2.9
3.0
3.2
3.3
3.5
3.8
5.1
5.7
6.6
7.0
7.4
7.5
SE
1.8
1.9
1.9
1.9
2.0
2.0
2.1
2.2
2.4
3.4
3.9
5.0
5.7
6.1
6.4
S
2.2
2.3
2.3
2.4
2.4
2.4
2.5
2.7
2.9
4.0
4.2
5.1
6.3
6.9
7.2
SW
3.1
3.1
3.2
3.2
3.3
3.3
3.4
3.5
3.9
5.4
6.2
13.8
13.8
13.9
13.9
NE
1.0
1.0
1.0
1.0
1.1
1.1
1.2
1.5
1.8
1.0
1.3
2.1
2.1
2.2
2.2
E
2.7
2.5
2.4
2.4
2.3
2.2
2.2
2.0
1.8
1.4
1.5
1.9
2.0
1.9
2.0
SE
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
3.1
2.8
2.4
2.3
2.3
2.2
S
SW
W
NW
2.2
3.6
1.1
1.6
2.2
3.6
1.1
1.5
2.2
3.6
1.1
1.5
2.2
3.6
1.1
1.5
2.2
3.5
1.1
1.6
2.2
3.5
1.1
1.6
2.2
3.5
1.1
1.7
2.2
3.4
1.2
1.8
2.2
2.7
1.2
2.0
3.0
1.3
1.0
2.2
3.0
1.0
1.0
2.4
2.2
1.0
2.3
1.9
2.1
1.0
2.0
2.0
2.2
1.3
1.4
2.1
2.1
1.4
1.6
2.2
Prepared by Metoc plc 1 April 2009
Spectral peakedness parameter gamma
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
1.6
1.5
1.5
1.5
1.6
1.6
1.7
1.8
2.0
2.2
2.4
2.3
2.0
1.4
1.6
N
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.6
1.9
2.1
2.0
2.1
2.1
2.2
W
6.7
6.7
6.7
6.8
6.8
6.8
7.0
7.1
7.2
14.7
14.7
14.6
15.4
15.8
15.9
NW
10.6
10.8
10.9
11.0
11.0
11.0
11.0
11.0
11.1
11.1
11.2
11.2
11.3
11.3
11.3
1-year February
SW Wave Hub Shore Export Cable - Metocean Design Basis
Notes
Intended for use in engineering design of seabed cable
Extreme Hs and Tz are generated by wave refraction model MIKE21
The model calculates the transformation to shore of extreme waves input at its offshore boundary
For waves moving offshore (e.g. from east) it calculates wind-generated wave growth
Other wave parameters are derived from Hs and Tz using industry-standard relationships:
Tp = 1.27*Tz
Hmax is calculated from Hs and Tz for 3 hr storm duration according to Rayleigh theory; limited to 0.78 depth
Lower Tmax/Tz ratio 1.05; Upper Tmax/Tz ratio 1.40; Central Tmax is same as Tp
Gamma derived fron Hs, Tp using formulation given in offshore standard DNV-OS-J101
Wave boundary inputs calculated from European Wave Model at 50.7°N 5.7°W Nov 1988 - Nov 2008
European model data (joint frequency tables) purchased under licence from UK Met Office
Wind inputs calculated from Seven Stones Light Vessel observations 50°6'9"N 6°6'0"W Sep 2001 - Jan 2009
Table A2 Wave criteria - Return Period 1 year - February
I:\P1209_JPKenny\R2056 metocean\App A.xls feb 09/04/2009 09:44
p 3 of 3
Hs (m) at KP 24.5
Hs (m) at KP 15
N
N
NW
NE
10
15
NE
10
NW
5
5
W
N
15
15
NW
Hs (m) at KP 1.5
0
E
SW
SE
W
5
E
0
SW
SE
S
W
SW
SE
S
0.78 H/d breaking limit
Extreme significant wave height, Hs (m)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
4.2
4.4
4.4
4.5
4.5
4.6
4.7
4.8
5.1
5.3
5.5
9.3
9.6
8.6
9.2
E
0
S
8 m Still water level above CD
NE
10
N
3.7
3.8
3.8
3.8
3.8
3.8
3.8
3.8
3.8
4.2
4.4
4.4
4.6
4.5
4.6
1-year March
NE
1.1
1.1
1.1
1.1
1.1
1.2
1.2
1.3
1.3
2.2
2.8
3.4
3.4
3.4
3.4
E
0.4
0.4
0.4
0.4
0.5
0.5
0.5
0.5
0.6
0.9
1.2
1.7
1.9
2.1
2.2
SE
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.3
0.5
0.7
1.1
1.4
1.6
1.7
S
0.2
0.2
0.3
0.3
0.3
0.3
0.3
0.3
0.4
0.8
0.9
1.1
1.7
2.0
2.2
E
2.1
2.1
2.2
2.2
2.3
2.4
2.4
2.5
2.7
3.6
3.9
4.6
4.9
5.1
5.2
SE
1.4
1.4
1.4
1.4
1.5
1.5
1.5
1.6
1.8
2.3
2.7
3.5
4.0
4.3
4.5
S
SW
W
NW
1.7
2.2
4.8
7.5
1.7
2.2
4.8
7.6
1.7
2.2
4.8
7.7
1.8
2.3
4.8
7.7
1.8
2.3
4.9
7.7
1.8
2.3
4.9
7.7
1.9
2.4
5.0
7.8
2.0
2.5
5.1
7.8
2.2
2.7
5.2
7.8
2.9
3.8
10.3
7.8
3.0
4.3
10.3
7.8
3.6
9.7
10.3
7.9
4.4
9.7
10.7
7.9
4.8
9.7
10.8
7.9
5.1
9.8
10.9
7.9
Prepared by Metoc plc 1 April 2009
Table A3 Wave criteria - Return Period 1 year - March
p 1 of 3
Mean zero-upcrossing wave period Tz (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
7.5
7.6
7.7
7.7
7.7
7.7
7.8
7.8
7.8
7.8
7.8
10.3
10.7
10.8
10.9
N
7.0
7.1
7.1
7.1
7.1
7.1
7.1
7.1
7.1
7.2
7.2
7.3
7.3
7.3
7.3
NE
4.2
4.2
4.2
4.2
4.2
4.2
4.2
4.1
4.1
6.3
6.3
6.3
6.3
6.3
6.3
SW
0.5
0.5
0.5
0.5
0.6
0.6
0.6
0.6
0.7
0.9
1.1
2.9
5.7
6.7
7.0
W
1.5
1.5
1.5
1.6
1.6
1.6
1.7
1.7
1.9
4.5
5.1
9.3
9.6
8.6
9.2
NW
4.2
4.4
4.4
4.5
4.5
4.6
4.7
4.8
5.1
5.3
5.5
5.1
5.2
5.4
5.4
1-year March
SW Wave Hub Shore Export Cable - Metocean Design Basis
I:\P1209_JPKenny\R2056 metocean\App A.xls mar 09/04/2009 09:44
8 m Still water level above CD
0.78 H/d breaking limit
Period of peak spectral energy Tp (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
9.5
9.7
9.8
9.8
9.8
9.8
9.9
9.9
9.9
9.9
10.0
13.1
13.6
13.8
13.9
N
8.9
9.0
9.0
9.0
9.1
9.1
9.1
9.1
9.1
9.1
9.2
9.3
9.3
9.3
9.3
1-year March
NE
5.4
5.4
5.4
5.3
5.3
5.3
5.3
5.2
5.2
7.9
7.9
8.0
8.0
8.0
8.0
E
2.7
2.7
2.8
2.8
2.9
3.0
3.0
3.2
3.4
4.5
5.0
5.8
6.2
6.5
6.6
SE
1.7
1.8
1.8
1.8
1.9
1.9
2.0
2.1
2.3
3.0
3.4
4.5
5.0
5.4
5.7
S
2.1
2.2
2.2
2.2
2.3
2.3
2.4
2.5
2.8
3.7
3.8
4.6
5.6
6.1
6.4
SW
2.7
2.8
2.8
2.9
2.9
3.0
3.0
3.1
3.4
4.8
5.4
12.3
12.3
12.4
12.4
SE
0.3
0.4
0.4
0.4
0.4
0.4
0.4
0.5
0.6
1.1
1.4
2.2
2.7
3.1
3.5
S
0.5
0.5
0.5
0.6
0.6
0.6
0.6
0.7
0.9
1.7
1.8
2.3
3.3
3.9
4.3
SW
1.0
1.1
1.1
1.1
1.2
1.2
1.2
1.3
1.4
1.9
2.3
5.5
10.7
12.5
13.1
Maximum wave height in a 3-hour sea state Hmax (m)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
7.0
7.8
8.4
8.5
8.6
8.7
8.9
9.2
9.6
10.0
10.5
17.3
17.8
15.9
17.0
N
7.0
7.2
7.2
7.2
7.2
7.2
7.2
7.2
7.3
8.1
8.5
8.5
8.7
8.6
8.8
NE
2.1
2.1
2.2
2.2
2.3
2.3
2.3
2.5
2.7
4.2
5.4
6.6
6.6
6.6
6.6
E
0.8
0.8
0.9
0.9
0.9
1.0
1.0
1.1
1.2
1.9
2.3
3.4
3.8
4.2
4.4
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
7.9
8.0
8.1
8.1
8.1
8.1
8.1
8.2
8.2
8.2
8.2
10.8
11.2
11.4
11.5
N
7.4
7.4
7.5
7.5
7.5
7.5
7.5
7.5
7.5
7.6
7.6
7.7
7.7
7.7
7.7
NE
4.5
4.4
4.4
4.4
4.4
4.4
4.4
4.3
4.3
6.6
6.6
6.6
6.6
6.6
6.6
E
2.2
2.2
2.3
2.3
2.4
2.5
2.5
2.6
2.8
3.8
4.1
4.8
5.1
5.4
5.4
NW
9.5
9.7
9.8
9.8
9.8
9.8
9.9
9.9
9.9
9.9
10.0
10.0
10.0
10.1
10.1
1-year March
Period associated with max wave height - lower limit of Tmax (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
W
6.0
6.1
6.1
6.2
6.2
6.2
6.3
6.4
6.6
13.1
13.1
13.1
13.6
13.8
13.9
W
2.9
3.0
3.0
3.1
3.1
3.2
3.3
3.4
3.6
8.5
9.5
17.3
17.8
15.9
17.0
NW
7.0
7.8
8.4
8.5
8.6
8.7
8.9
9.2
9.6
10.0
10.5
9.7
9.8
10.2
10.3
1-year March
SE
1.4
1.5
1.5
1.5
1.5
1.6
1.6
1.7
1.9
2.5
2.8
3.7
4.2
4.5
4.7
S
SW
W
NW
1.7
2.3
5.0
7.9
1.8
2.3
5.0
8.0
1.8
2.3
5.1
8.1
1.8
2.4
5.1
8.1
1.9
2.4
5.1
8.1
1.9
2.4
5.1
8.1
2.0
2.5
5.2
8.1
2.1
2.6
5.3
8.2
2.3
2.9
5.4
8.2
3.0
4.0
10.8
8.2
3.2
4.5
10.8
8.2
3.8
10.2
10.8
8.3
4.7
10.2
11.2
8.3
5.1
10.2
11.4
8.3
5.3
10.2
11.5
8.3
Prepared by Metoc plc 1 April 2009
Table A3 Wave criteria - Return Period 1 year - March
p 2 of 3
SW Wave Hub Shore Export Cable - Metocean Design Basis
I:\P1209_JPKenny\R2056 metocean\App A.xls mar 09/04/2009 09:44
8 m Still water level above CD
0.78 H/d breaking limit
Period associated with max wave height - upper limit of Tmax (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
10.5
10.7
10.8
10.8
10.8
10.8
10.9
10.9
10.9
11.0
11.0
14.4
15.0
15.2
15.3
N
9.8
9.9
10.0
10.0
10.0
10.0
10.0
10.0
10.0
10.1
10.1
10.2
10.2
10.2
10.2
1-year March
NE
5.9
5.9
5.9
5.9
5.9
5.8
5.8
5.8
5.7
8.8
8.8
8.8
8.8
8.8
8.8
E
2.9
3.0
3.1
3.1
3.2
3.3
3.4
3.5
3.8
5.0
5.5
6.4
6.8
7.2
7.2
SE
1.9
1.9
2.0
2.0
2.0
2.1
2.2
2.3
2.5
3.3
3.8
4.9
5.6
6.0
6.3
S
2.3
2.4
2.4
2.5
2.5
2.6
2.6
2.8
3.1
4.0
4.2
5.1
6.2
6.8
7.1
SW
3.0
3.1
3.1
3.2
3.2
3.3
3.3
3.5
3.8
5.3
6.0
13.6
13.6
13.6
13.7
NE
1.0
1.0
1.0
1.0
1.0
1.1
1.1
1.4
1.8
1.0
1.4
2.2
2.1
2.2
2.2
E
2.4
2.4
2.3
2.3
2.2
2.2
2.1
2.1
2.0
1.4
1.6
1.9
1.9
1.8
2.0
SE
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
3.0
2.9
2.2
2.2
2.2
2.2
S
SW
W
NW
2.2
3.6
1.1
1.5
2.2
3.6
1.1
1.5
2.2
3.6
1.1
1.5
2.2
3.6
1.1
1.5
2.2
3.6
1.1
1.5
2.2
3.5
1.1
1.6
2.2
3.5
1.1
1.7
2.2
3.4
1.2
1.8
2.2
2.7
1.2
2.0
3.0
1.1
1.0
2.2
2.9
1.0
1.0
2.4
2.2
1.0
2.3
1.9
2.1
1.0
2.0
2.0
2.1
1.3
1.4
2.1
2.1
1.4
1.6
2.2
Prepared by Metoc plc 1 April 2009
Spectral peakedness parameter gamma
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
1.5
1.5
1.5
1.5
1.5
1.6
1.7
1.8
2.0
2.2
2.4
2.3
2.0
1.4
1.6
N
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.9
2.1
2.0
2.1
2.1
2.2
W
6.7
6.7
6.8
6.8
6.8
6.8
7.0
7.1
7.2
14.4
14.4
14.4
15.0
15.2
15.3
NW
10.5
10.7
10.8
10.8
10.8
10.8
10.9
10.9
10.9
11.0
11.0
11.0
11.1
11.1
11.1
1-year March
SW Wave Hub Shore Export Cable - Metocean Design Basis
Notes
Intended for use in engineering design of seabed cable
Extreme Hs and Tz are generated by wave refraction model MIKE21
The model calculates the transformation to shore of extreme waves input at its offshore boundary
For waves moving offshore (e.g. from east) it calculates wind-generated wave growth
Other wave parameters are derived from Hs and Tz using industry-standard relationships:
Tp = 1.27*Tz
Hmax is calculated from Hs and Tz for 3 hr storm duration according to Rayleigh theory; limited to 0.78 depth
Lower Tmax/Tz ratio 1.05; Upper Tmax/Tz ratio 1.40; Central Tmax is same as Tp
Gamma derived fron Hs, Tp using formulation given in offshore standard DNV-OS-J101
Wave boundary inputs calculated from European Wave Model at 50.7°N 5.7°W Nov 1988 - Nov 2008
European model data (joint frequency tables) purchased under licence from UK Met Office
Wind inputs calculated from Seven Stones Light Vessel observations 50°6'9"N 6°6'0"W Sep 2001 - Jan 2009
Table A3 Wave criteria - Return Period 1 year - March
I:\P1209_JPKenny\R2056 metocean\App A.xls mar 09/04/2009 09:44
p 3 of 3
Hs (m) at KP 24.5
Hs (m) at KP 15
N
N
NW
NE
10
15
NE
10
NW
5
5
W
N
15
15
NW
Hs (m) at KP 1.5
0
E
SW
SE
W
5
E
0
SW
SE
S
W
SW
SE
S
0.78 H/d breaking limit
Extreme significant wave height, Hs (m)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
4.0
4.1
4.2
4.3
4.3
4.4
4.4
4.6
4.8
5.0
5.3
8.2
8.0
7.2
7.7
N
3.6
3.6
3.6
3.6
3.6
3.6
3.6
3.6
3.7
4.1
4.3
4.3
4.4
4.4
4.5
1-year April
NE
1.1
1.1
1.1
1.1
1.2
1.2
1.2
1.3
1.4
2.2
2.8
3.5
3.5
3.5
3.5
E
0.3
0.3
0.3
0.4
0.4
0.4
0.4
0.5
0.5
0.9
1.2
1.7
1.9
2.1
2.2
SE
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.3
0.5
0.7
1.1
1.3
1.5
1.7
S
0.2
0.2
0.3
0.3
0.3
0.3
0.3
0.3
0.4
0.8
0.9
1.1
1.6
1.9
2.1
E
1.8
1.9
2.0
2.0
2.1
2.2
2.3
2.4
2.6
3.5
3.9
4.5
4.8
5.1
5.1
SE
1.3
1.4
1.4
1.4
1.4
1.5
1.5
1.6
1.8
2.3
2.7
3.4
3.9
4.2
4.4
S
SW
W
NW
1.6
2.0
4.7
7.3
1.7
2.1
4.7
7.5
1.7
2.1
4.7
7.5
1.7
2.1
4.7
7.5
1.8
2.2
4.8
7.6
1.8
2.2
4.8
7.6
1.9
2.2
4.9
7.6
2.0
2.3
5.0
7.6
2.1
2.6
5.1
7.6
2.8
3.7
9.7
7.6
3.0
4.2
9.7
7.7
3.6
9.1
9.7
7.7
4.4
9.1
9.9
7.7
4.8
9.2
9.9
7.7
5.0
9.2
10.0
7.7
Prepared by Metoc plc 1 April 2009
Mean zero-upcrossing wave period Tz (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
7.3
7.5
7.5
7.5
7.6
7.6
7.6
7.6
7.6
7.6
7.7
9.7
9.9
9.9
10.0
E
0
S
7.5 m Still water level above CD
NE
10
N
6.9
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.1
7.1
7.2
7.2
7.2
7.2
NE
4.3
4.3
4.3
4.2
4.2
4.2
4.2
4.2
4.1
6.3
6.3
6.4
6.4
6.4
6.4
SW
0.4
0.5
0.5
0.5
0.5
0.5
0.5
0.6
0.6
0.9
1.1
2.5
5.0
5.8
6.2
W
1.4
1.5
1.5
1.5
1.5
1.5
1.6
1.7
1.8
3.8
4.4
8.2
8.0
7.2
7.7
NW
4.0
4.1
4.2
4.3
4.3
4.4
4.4
4.6
4.8
5.0
5.3
4.9
5.0
5.1
5.2
1-year April
SW Wave Hub Shore Export Cable - Metocean Design Basis
Table A4 Wave criteria - Return Period 1 year - April
I:\P1209_JPKenny\R2056 metocean\App A.xls apr 09/04/2009 09:44
p 1 of 3
8 m Still water level above CD
0.78 H/d breaking limit
Period of peak spectral energy Tp (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
9.3
9.5
9.5
9.6
9.6
9.6
9.6
9.6
9.7
9.7
9.7
12.3
12.5
12.6
12.7
N
8.7
8.8
8.9
8.9
8.9
8.9
8.9
8.9
8.9
9.0
9.0
9.1
9.1
9.1
9.1
1-year April
NE
5.4
5.4
5.4
5.4
5.4
5.4
5.3
5.3
5.3
8.0
8.0
8.1
8.1
8.1
8.1
E
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.1
3.3
4.5
5.0
5.8
6.1
6.5
6.5
SE
1.7
1.7
1.8
1.8
1.8
1.9
1.9
2.0
2.2
3.0
3.4
4.4
4.9
5.3
5.6
S
2.1
2.1
2.2
2.2
2.2
2.3
2.4
2.5
2.7
3.5
3.8
4.5
5.5
6.0
6.4
SW
2.6
2.6
2.7
2.7
2.7
2.8
2.8
2.9
3.2
4.7
5.3
11.6
11.6
11.6
11.6
W
5.9
6.0
6.0
6.0
6.1
6.1
6.2
6.3
6.4
12.3
12.3
12.3
12.5
12.6
12.7
SE
0.3
0.3
0.4
0.4
0.4
0.4
0.4
0.5
0.6
1.1
1.4
2.1
2.6
3.0
3.3
S
0.5
0.5
0.5
0.5
0.6
0.6
0.6
0.7
0.8
1.5
1.7
2.2
3.2
3.8
4.2
SW
0.9
0.9
1.0
1.0
1.0
1.0
1.1
1.2
1.3
1.9
2.2
4.8
9.5
11.0
11.6
W
2.8
2.9
2.9
2.9
3.0
3.0
3.1
3.3
3.5
7.2
8.2
15.4
14.9
13.5
14.4
Maximum wave height in a 3-hour sea state Hmax (m)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
6.6
7.4
8.0
8.1
8.2
8.3
8.5
8.8
9.2
9.5
10.0
15.4
14.9
13.5
14.4
N
6.6
6.9
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.9
8.2
8.2
8.4
8.4
8.6
NE
2.2
2.2
2.2
2.3
2.3
2.4
2.4
2.5
2.7
4.3
5.5
6.7
6.7
6.7
6.8
E
0.6
0.7
0.7
0.8
0.8
0.9
0.9
1.0
1.1
1.8
2.3
3.3
3.8
4.1
4.3
1-year April
Period associated with max wave height - lower limit of Tmax (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
7.7
7.8
7.9
7.9
7.9
8.0
8.0
8.0
8.0
8.0
8.0
10.2
10.4
10.4
10.5
N
7.2
7.3
7.3
7.4
7.4
7.4
7.4
7.4
7.4
7.4
7.5
7.5
7.5
7.5
7.5
NE
4.5
4.5
4.5
4.5
4.4
4.4
4.4
4.4
4.4
6.6
6.6
6.7
6.7
6.7
6.7
E
1.9
2.0
2.1
2.1
2.2
2.3
2.4
2.5
2.7
3.7
4.1
4.8
5.1
5.3
5.4
NW
9.3
9.5
9.5
9.6
9.6
9.6
9.6
9.6
9.7
9.7
9.7
9.8
9.8
9.8
9.8
SE
1.4
1.4
1.5
1.5
1.5
1.5
1.6
1.7
1.8
2.4
2.8
3.6
4.1
4.4
4.6
NW
6.6
7.4
8.0
8.1
8.2
8.3
8.5
8.8
9.2
9.5
10.0
9.3
9.4
9.8
9.9
1-year April
S
SW
W
NW
1.7
2.1
4.9
7.7
1.8
2.2
4.9
7.8
1.8
2.2
5.0
7.9
1.8
2.2
5.0
7.9
1.9
2.3
5.0
7.9
1.9
2.3
5.0
8.0
1.9
2.4
5.1
8.0
2.1
2.4
5.2
8.0
2.3
2.7
5.3
8.0
2.9
3.9
10.1
8.0
3.1
4.4
10.2
8.0
3.7
9.6
10.2
8.1
4.6
9.6
10.4
8.1
5.0
9.6
10.4
8.1
5.3
9.6
10.5
8.1
Prepared by Metoc plc 1 April 2009
SW Wave Hub Shore Export Cable - Metocean Design Basis
Table A4 Wave criteria - Return Period 1 year - April
I:\P1209_JPKenny\R2056 metocean\App A.xls apr 09/04/2009 09:44
p 2 of 3
8 m Still water level above CD
0.78 H/d breaking limit
Period associated with max wave height - upper limit of Tmax (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
10.2
10.4
10.5
10.6
10.6
10.6
10.6
10.6
10.6
10.7
10.7
13.6
13.8
13.9
14.0
N
9.6
9.7
9.8
9.8
9.8
9.8
9.8
9.8
9.8
9.9
10.0
10.0
10.1
10.1
10.1
1-year April
NE
6.0
6.0
6.0
5.9
5.9
5.9
5.9
5.8
5.8
8.8
8.8
8.9
8.9
8.9
8.9
E
2.5
2.6
2.7
2.8
2.9
3.1
3.2
3.4
3.7
4.9
5.5
6.3
6.8
7.1
7.2
SE
1.9
1.9
1.9
2.0
2.0
2.1
2.1
2.2
2.5
3.3
3.7
4.8
5.4
5.9
6.2
S
2.3
2.3
2.4
2.4
2.5
2.5
2.6
2.8
3.0
3.9
4.1
5.0
6.1
6.7
7.0
SW
2.8
2.9
2.9
3.0
3.0
3.1
3.1
3.2
3.6
5.1
5.8
12.8
12.8
12.8
12.8
NE
1.0
1.0
1.0
1.0
1.1
1.1
1.2
1.4
1.8
1.0
1.3
2.1
2.1
2.2
2.2
E
2.6
2.5
2.4
2.3
2.2
2.1
2.1
1.9
1.8
1.4
1.5
1.9
2.0
1.8
2.0
SE
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
3.1
2.8
2.3
2.3
2.2
2.2
S
SW
W
NW
2.2
3.6
1.0
1.5
2.2
3.6
1.1
1.5
2.2
3.6
1.1
1.5
2.2
3.6
1.1
1.5
2.2
3.6
1.1
1.5
2.2
3.6
1.1
1.6
2.2
3.5
1.1
1.6
2.2
3.4
1.1
1.8
2.2
2.7
1.2
2.0
3.0
1.2
1.0
2.1
2.9
1.0
1.0
2.4
2.1
1.0
2.2
1.9
2.1
1.0
1.9
2.0
2.1
1.2
1.4
2.1
2.1
1.4
1.6
2.2
Prepared by Metoc plc 1 April 2009
Spectral peakedness parameter gamma
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
1.5
1.5
1.5
1.5
1.5
1.6
1.6
1.8
2.0
2.1
2.4
2.2
1.9
1.4
1.6
N
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.9
2.1
2.0
2.1
2.1
2.2
W
6.5
6.6
6.6
6.6
6.7
6.7
6.8
6.9
7.1
13.5
13.5
13.6
13.8
13.9
14.0
NW
10.2
10.4
10.5
10.6
10.6
10.6
10.6
10.6
10.6
10.7
10.7
10.8
10.8
10.8
10.8
1-year April
SW Wave Hub Shore Export Cable - Metocean Design Basis
Notes
Intended for use in engineering design of seabed cable
Extreme Hs and Tz are generated by wave refraction model MIKE21
The model calculates the transformation to shore of extreme waves input at its offshore boundary
For waves moving offshore (e.g. from east) it calculates wind-generated wave growth
Other wave parameters are derived from Hs and Tz using industry-standard relationships:
Tp = 1.27*Tz
Hmax is calculated from Hs and Tz for 3 hr storm duration according to Rayleigh theory; limited to 0.78 depth
Lower Tmax/Tz ratio 1.05; Upper Tmax/Tz ratio 1.40; Central Tmax is same as Tp
Gamma derived fron Hs, Tp using formulation given in offshore standard DNV-OS-J101
Wave boundary inputs calculated from European Wave Model at 50.7°N 5.7°W Nov 1988 - Nov 2008
European model data (joint frequency tables) purchased under licence from UK Met Office
Wind inputs calculated from Seven Stones Light Vessel observations 50°6'9"N 6°6'0"W Sep 2001 - Jan 2009
Table A4 Wave criteria - Return Period 1 year - April
I:\P1209_JPKenny\R2056 metocean\App A.xls apr 09/04/2009 09:44
p 3 of 3
Hs (m) at KP 24.5
Hs (m) at KP 15
N
N
NW
NE
10
15
NE
10
NW
5
5
W
N
15
15
NW
Hs (m) at KP 1.5
0
E
SW
SE
W
5
E
0
SW
SE
S
W
SW
SE
S
0.78 H/d breaking limit
Extreme significant wave height, Hs (m)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
3.6
3.7
3.7
3.7
3.8
3.8
3.9
4.0
4.2
4.3
4.5
7.2
6.9
6.4
6.8
N
3.4
3.5
3.5
3.5
3.5
3.5
3.5
3.5
3.5
4.0
4.1
4.1
4.2
4.2
4.3
1-year May
NE
1.0
1.0
1.1
1.1
1.1
1.1
1.1
1.2
1.3
2.1
2.7
3.3
3.3
3.3
3.4
E
0.3
0.3
0.4
0.4
0.4
0.4
0.4
0.5
0.5
0.9
1.1
1.6
1.8
1.9
2.0
SE
0.1
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.3
0.5
0.6
0.9
1.1
1.3
1.4
S
0.2
0.2
0.2
0.2
0.3
0.3
0.3
0.3
0.4
0.8
0.8
1.0
1.5
1.8
2.0
E
1.9
2.0
2.1
2.1
2.2
2.2
2.3
2.4
2.6
3.4
3.8
4.4
4.6
4.9
4.9
SE
1.3
1.3
1.4
1.4
1.4
1.4
1.5
1.6
1.7
2.4
2.6
3.2
3.6
3.9
4.1
S
SW
W
NW
1.6
2.0
4.5
7.0
1.6
2.0
4.5
7.1
1.7
2.0
4.6
7.1
1.7
2.1
4.6
7.1
1.7
2.1
4.6
7.1
1.8
2.1
4.6
7.1
1.8
2.2
4.7
7.1
1.9
2.2
4.8
7.1
2.1
2.5
4.9
7.1
2.8
3.5
9.1
7.2
2.9
4.0
9.2
7.2
3.5
8.8
9.2
7.2
4.2
8.8
9.3
7.2
4.6
8.8
9.3
7.2
4.9
8.8
9.4
7.2
Prepared by Metoc plc 1 April 2009
Mean zero-upcrossing wave period Tz (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
7.0
7.1
7.1
7.1
7.1
7.1
7.1
7.1
7.1
7.2
7.2
9.2
9.3
9.3
9.4
E
0
S
7.5 m Still water level above CD
NE
10
N
6.8
6.8
6.9
6.9
6.9
6.9
6.9
6.9
6.9
6.9
7.0
7.0
7.0
7.0
7.0
NE
4.2
4.2
4.2
4.2
4.1
4.1
4.1
4.1
4.0
6.2
6.2
6.2
6.2
6.2
6.2
SW
0.4
0.4
0.4
0.4
0.5
0.5
0.5
0.5
0.6
0.8
1.0
2.3
4.7
5.4
5.7
W
1.3
1.4
1.4
1.4
1.4
1.4
1.5
1.6
1.7
3.3
3.8
7.2
6.9
6.4
6.8
NW
3.6
3.7
3.7
3.7
3.8
3.8
3.9
4.0
4.2
4.3
4.5
4.3
4.4
4.5
4.5
1-year May
SW Wave Hub Shore Export Cable - Metocean Design Basis
Table A5 Wave criteria - Return Period 1 year - May
I:\P1209_JPKenny\R2056 metocean\App A.xls may 09/04/2009 09:44
p 1 of 3
8 m Still water level above CD
0.78 H/d breaking limit
Period of peak spectral energy Tp (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
8.9
9.0
9.0
9.0
9.0
9.0
9.0
9.0
9.0
9.1
9.1
11.7
11.8
11.8
11.9
N
8.6
8.7
8.7
8.7
8.7
8.7
8.7
8.7
8.7
8.8
8.9
8.9
8.9
8.9
8.9
1-year May
NE
5.3
5.3
5.3
5.3
5.2
5.2
5.2
5.2
5.1
7.8
7.8
7.9
7.9
7.9
7.9
E
2.4
2.5
2.6
2.7
2.7
2.8
2.9
3.0
3.2
4.4
4.8
5.5
5.9
6.2
6.3
SE
1.7
1.7
1.7
1.8
1.8
1.8
1.9
2.0
2.2
3.0
3.4
4.1
4.6
4.9
5.2
S
2.0
2.1
2.1
2.2
2.2
2.2
2.3
2.4
2.7
3.6
3.7
4.5
5.4
5.9
6.2
SW
2.5
2.5
2.6
2.6
2.6
2.7
2.7
2.8
3.1
4.5
5.1
11.2
11.2
11.2
11.2
W
5.7
5.8
5.8
5.8
5.9
5.9
6.0
6.1
6.2
11.6
11.6
11.7
11.8
11.8
11.9
SE
0.3
0.3
0.3
0.4
0.4
0.4
0.4
0.5
0.5
1.1
1.3
1.8
2.2
2.5
2.8
S
0.5
0.5
0.5
0.5
0.5
0.6
0.6
0.7
0.8
1.5
1.7
2.1
3.0
3.6
3.9
SW
0.8
0.9
0.9
0.9
1.0
1.0
1.0
1.1
1.2
1.7
2.0
4.4
8.8
10.2
10.8
W
2.6
2.7
2.7
2.7
2.8
2.8
2.9
3.0
3.2
6.3
7.2
13.6
13.0
12.0
12.7
Maximum wave height in a 3-hour sea state Hmax (m)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
6.6
7.0
7.1
7.1
7.2
7.3
7.4
7.7
8.0
8.3
8.6
13.6
13.0
12.0
12.7
N
6.6
6.7
6.7
6.7
6.7
6.7
6.7
6.8
6.8
7.6
7.9
7.9
8.1
8.1
8.2
NE
2.0
2.1
2.1
2.1
2.2
2.2
2.3
2.4
2.6
4.1
5.3
6.4
6.4
6.5
6.5
E
0.7
0.7
0.7
0.8
0.8
0.9
0.9
1.0
1.1
1.7
2.1
3.1
3.5
3.8
4.0
1-year May
Period associated with max wave height - lower limit of Tmax (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
7.3
7.4
7.4
7.5
7.5
7.5
7.5
7.5
7.5
7.5
7.5
9.7
9.7
9.8
9.8
N
7.1
7.2
7.2
7.2
7.2
7.2
7.2
7.2
7.2
7.3
7.3
7.4
7.4
7.4
7.4
NE
4.4
4.4
4.4
4.4
4.3
4.3
4.3
4.3
4.3
6.5
6.5
6.5
6.5
6.5
6.5
E
2.0
2.1
2.2
2.2
2.3
2.3
2.4
2.5
2.7
3.6
4.0
4.6
4.9
5.1
5.2
NW
8.9
9.0
9.0
9.0
9.0
9.0
9.0
9.0
9.0
9.1
9.1
9.1
9.1
9.1
9.1
SE
1.4
1.4
1.4
1.5
1.5
1.5
1.6
1.7
1.8
2.5
2.8
3.4
3.8
4.0
4.3
NW
6.6
7.0
7.1
7.1
7.2
7.3
7.4
7.7
8.0
8.3
8.6
8.2
8.3
8.5
8.6
1-year May
S
SW
W
NW
1.7
2.1
4.7
7.3
1.7
2.1
4.8
7.4
1.8
2.1
4.8
7.4
1.8
2.2
4.8
7.5
1.8
2.2
4.9
7.5
1.8
2.2
4.9
7.5
1.9
2.3
5.0
7.5
2.0
2.3
5.0
7.5
2.2
2.6
5.2
7.5
2.9
3.7
9.6
7.5
3.1
4.2
9.6
7.5
3.7
9.2
9.7
7.5
4.5
9.2
9.7
7.6
4.9
9.3
9.8
7.6
5.1
9.3
9.8
7.6
Prepared by Metoc plc 1 April 2009
SW Wave Hub Shore Export Cable - Metocean Design Basis
Table A5 Wave criteria - Return Period 1 year - May
I:\P1209_JPKenny\R2056 metocean\App A.xls may 09/04/2009 09:44
p 2 of 3
8 m Still water level above CD
0.78 H/d breaking limit
Period associated with max wave height - upper limit of Tmax (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
9.8
9.9
9.9
9.9
9.9
9.9
10.0
10.0
10.0
10.0
10.0
12.9
13.0
13.1
13.1
N
9.5
9.6
9.6
9.6
9.6
9.6
9.6
9.6
9.6
9.7
9.8
9.8
9.8
9.9
9.9
1-year May
NE
5.9
5.8
5.8
5.8
5.8
5.8
5.8
5.7
5.7
8.6
8.6
8.7
8.7
8.7
8.7
E
2.7
2.8
2.9
2.9
3.0
3.1
3.2
3.3
3.6
4.8
5.3
6.1
6.5
6.9
6.9
SE
1.8
1.9
1.9
1.9
2.0
2.0
2.1
2.2
2.4
3.3
3.7
4.5
5.0
5.4
5.7
S
2.2
2.3
2.3
2.4
2.4
2.5
2.5
2.7
2.9
3.9
4.1
4.9
5.9
6.5
6.8
SW
2.7
2.8
2.8
2.9
2.9
2.9
3.0
3.1
3.4
4.9
5.6
12.3
12.3
12.3
12.4
W
6.3
6.4
6.4
6.4
6.5
6.5
6.6
6.7
6.9
12.8
12.8
12.9
13.0
13.1
13.1
NE
1.0
1.0
1.0
1.0
1.0
1.1
1.1
1.4
1.8
1.0
1.3
2.2
2.2
2.2
2.2
E
2.4
2.2
2.2
2.1
2.0
2.0
2.0
1.9
1.8
1.4
1.5
1.9
1.9
1.8
2.0
SE
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.7
2.3
2.2
2.2
2.1
2.1
S
SW
W
NW
2.2
3.6
1.0
1.4
2.2
3.6
1.0
1.4
2.2
3.6
1.1
1.4
2.2
3.6
1.1
1.5
2.2
3.6
1.1
1.5
2.2
3.6
1.1
1.5
2.2
3.5
1.1
1.6
2.2
3.4
1.1
1.7
2.2
2.7
1.2
1.9
2.9
1.1
1.0
2.1
2.8
1.0
1.0
2.3
2.1
1.0
2.1
2.0
2.1
1.0
1.8
2.0
2.1
1.2
1.5
2.2
2.1
1.4
1.7
2.2
Prepared by Metoc plc 1 April 2009
Spectral peakedness parameter gamma
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
1.4
1.4
1.4
1.5
1.5
1.5
1.6
1.7
1.9
2.1
2.3
2.1
1.8
1.5
1.7
N
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.9
2.1
2.0
2.1
2.1
2.2
NW
9.8
9.9
9.9
9.9
9.9
9.9
10.0
10.0
10.0
10.0
10.0
10.1
10.1
10.1
10.1
1-year May
SW Wave Hub Shore Export Cable - Metocean Design Basis
Notes
Intended for use in engineering design of seabed cable
Extreme Hs and Tz are generated by wave refraction model MIKE21
The model calculates the transformation to shore of extreme waves input at its offshore boundary
For waves moving offshore (e.g. from east) it calculates wind-generated wave growth
Other wave parameters are derived from Hs and Tz using industry-standard relationships:
Tp = 1.27*Tz
Hmax is calculated from Hs and Tz for 3 hr storm duration according to Rayleigh theory; limited to 0.78 depth
Lower Tmax/Tz ratio 1.05; Upper Tmax/Tz ratio 1.40; Central Tmax is same as Tp
Gamma derived fron Hs, Tp using formulation given in offshore standard DNV-OS-J101
Wave boundary inputs calculated from European Wave Model at 50.7°N 5.7°W Nov 1988 - Nov 2008
European model data (joint frequency tables) purchased under licence from UK Met Office
Wind inputs calculated from Seven Stones Light Vessel observations 50°6'9"N 6°6'0"W Sep 2001 - Jan 2009
Table A5 Wave criteria - Return Period 1 year - May
I:\P1209_JPKenny\R2056 metocean\App A.xls may 09/04/2009 09:44
p 3 of 3
Hs (m) at KP 24.5
Hs (m) at KP 15
N
N
NW
NE
10
15
NE
10
NW
5
5
W
N
15
15
NW
Hs (m) at KP 1.5
0
E
SW
SE
W
5
E
0
SW
SE
S
W
SW
SE
S
0.78 H/d breaking limit
Extreme significant wave height, Hs (m)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
3.1
3.1
3.1
3.2
3.2
3.2
3.3
3.4
3.6
3.7
3.8
5.8
5.6
5.4
5.6
N
2.9
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.1
3.4
3.5
3.5
3.6
3.6
3.6
1-year June
NE
0.7
0.7
0.7
0.7
0.8
0.8
0.8
0.9
0.9
1.7
2.1
2.5
2.5
2.5
2.5
E
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.4
0.4
0.7
0.9
1.2
1.4
1.5
1.6
SE
0.1
0.1
0.1
0.1
0.1
0.1
0.2
0.2
0.2
0.4
0.5
0.8
1.0
1.2
1.3
S
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.3
0.3
0.7
0.8
1.0
1.5
1.8
2.0
E
1.7
1.8
1.8
1.9
2.0
2.0
2.1
2.2
2.4
3.1
3.4
3.9
4.2
4.4
4.4
SE
1.2
1.2
1.2
1.3
1.3
1.3
1.4
1.4
1.6
2.2
2.4
3.1
3.5
3.7
3.9
S
SW
W
NW
1.5
1.8
4.2
6.5
1.5
1.8
4.2
6.5
1.5
1.9
4.2
6.6
1.6
1.9
4.2
6.6
1.6
1.9
4.3
6.6
1.6
2.0
4.3
6.6
1.7
2.0
4.4
6.6
1.8
2.1
4.4
6.6
1.9
2.3
4.5
6.6
2.8
3.5
8.3
6.6
2.9
4.0
8.3
6.6
3.5
8.2
8.4
6.6
4.2
8.2
8.4
6.6
4.6
8.2
8.4
6.6
4.8
8.2
8.5
6.6
Prepared by Metoc plc 1 April 2009
Mean zero-upcrossing wave period Tz (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
6.5
6.5
6.6
6.6
6.6
6.6
6.6
6.6
6.6
6.6
6.6
8.4
8.4
8.4
8.5
E
0
S
7 m Still water level above CD
NE
10
N
6.3
6.3
6.3
6.3
6.3
6.3
6.3
6.3
6.3
6.4
6.4
6.4
6.4
6.4
6.4
NE
3.6
3.6
3.6
3.6
3.6
3.6
3.6
3.5
3.5
5.4
5.4
5.4
5.4
5.4
5.4
SW
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.5
0.8
1.0
2.0
4.1
4.7
5.0
W
1.1
1.1
1.2
1.2
1.2
1.2
1.3
1.3
1.4
2.7
3.2
5.8
5.6
5.4
5.6
NW
3.1
3.1
3.1
3.2
3.2
3.2
3.3
3.4
3.6
3.7
3.8
3.7
3.7
3.8
3.8
1-year June
SW Wave Hub Shore Export Cable - Metocean Design Basis
Table A6 Wave criteria - Return Period 1 year - June
I:\P1209_JPKenny\R2056 metocean\App A.xls jun 09/04/2009 09:44
p 1 of 3
7 m Still water level above CD
0.78 H/d breaking limit
Period of peak spectral energy Tp (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
8.3
8.3
8.3
8.3
8.3
8.3
8.3
8.3
8.3
8.4
8.4
10.6
10.7
10.7
10.7
N
8.0
8.0
8.0
8.0
8.0
8.0
8.0
8.0
8.0
8.1
8.1
8.2
8.2
8.2
8.2
1-year June
NE
4.6
4.6
4.6
4.6
4.5
4.5
4.5
4.5
4.4
6.8
6.8
6.8
6.8
6.8
6.8
E
2.2
2.3
2.3
2.4
2.5
2.6
2.6
2.8
3.0
4.0
4.3
5.0
5.3
5.6
5.6
SE
1.5
1.5
1.6
1.6
1.6
1.7
1.7
1.8
2.0
2.7
3.1
3.9
4.4
4.7
5.0
S
1.9
1.9
1.9
2.0
2.0
2.0
2.1
2.2
2.4
3.5
3.7
4.4
5.3
5.8
6.1
SW
2.3
2.3
2.4
2.4
2.5
2.5
2.5
2.6
2.9
4.4
5.0
10.4
10.4
10.4
10.4
W
5.3
5.3
5.4
5.4
5.4
5.5
5.5
5.6
5.7
10.6
10.6
10.6
10.7
10.7
10.7
SE
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.4
0.4
0.9
1.1
1.6
2.1
2.4
2.6
S
0.4
0.4
0.4
0.4
0.5
0.5
0.5
0.6
0.7
1.5
1.6
2.0
3.0
3.5
3.8
SW
0.7
0.8
0.8
0.8
0.8
0.8
0.9
0.9
1.0
1.6
1.9
3.8
7.7
9.0
9.4
W
2.2
2.2
2.3
2.3
2.4
2.4
2.5
2.6
2.7
5.1
6.0
10.9
10.6
10.2
10.6
Maximum wave height in a 3-hour sea state Hmax (m)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
5.9
6.0
6.1
6.1
6.2
6.2
6.3
6.6
6.8
7.0
7.3
10.9
10.6
10.2
10.6
N
5.7
5.7
5.7
5.7
5.7
5.8
5.8
5.8
5.9
6.5
6.8
6.7
6.8
6.9
6.9
NE
1.4
1.4
1.4
1.5
1.5
1.6
1.6
1.7
1.9
3.3
4.2
4.9
4.9
4.9
4.9
E
0.6
0.6
0.6
0.6
0.7
0.7
0.7
0.8
0.9
1.4
1.7
2.4
2.8
3.0
3.1
1-year June
Period associated with max wave height - lower limit of Tmax (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
6.8
6.9
6.9
6.9
6.9
6.9
6.9
6.9
6.9
6.9
6.9
8.8
8.8
8.9
8.9
N
6.6
6.6
6.6
6.6
6.6
6.6
6.6
6.6
6.6
6.7
6.7
6.7
6.7
6.7
6.7
NE
3.8
3.8
3.8
3.8
3.7
3.7
3.7
3.7
3.7
5.6
5.6
5.6
5.6
5.6
5.6
E
1.8
1.9
1.9
2.0
2.0
2.1
2.2
2.3
2.5
3.3
3.6
4.1
4.4
4.6
4.6
NW
8.3
8.3
8.3
8.3
8.3
8.3
8.3
8.3
8.3
8.4
8.4
8.4
8.4
8.4
8.4
SE
1.3
1.3
1.3
1.3
1.4
1.4
1.4
1.5
1.6
2.3
2.6
3.2
3.6
3.9
4.1
NW
5.9
6.0
6.1
6.1
6.2
6.2
6.3
6.6
6.8
7.0
7.3
7.1
7.2
7.3
7.3
1-year June
S
SW
W
NW
1.5
1.9
4.4
6.8
1.6
1.9
4.4
6.9
1.6
2.0
4.4
6.9
1.6
2.0
4.5
6.9
1.7
2.0
4.5
6.9
1.7
2.1
4.5
6.9
1.7
2.1
4.6
6.9
1.8
2.2
4.6
6.9
2.0
2.4
4.8
6.9
2.9
3.6
8.8
6.9
3.0
4.2
8.8
6.9
3.6
8.6
8.8
6.9
4.4
8.6
8.8
6.9
4.8
8.6
8.9
6.9
5.0
8.6
8.9
6.9
Prepared by Metoc plc 1 April 2009
SW Wave Hub Shore Export Cable - Metocean Design Basis
Table A6 Wave criteria - Return Period 1 year - June
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p 2 of 3
7 m Still water level above CD
0.78 H/d breaking limit
Period associated with max wave height - upper limit of Tmax (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
9.1
9.2
9.2
9.2
9.2
9.2
9.2
9.2
9.2
9.2
9.2
11.7
11.8
11.8
11.8
N
8.8
8.8
8.8
8.9
8.9
8.9
8.9
8.9
8.9
8.9
8.9
9.0
9.0
9.0
9.0
1-year June
NE
5.1
5.1
5.0
5.0
5.0
5.0
5.0
4.9
4.9
7.5
7.5
7.5
7.5
7.5
7.5
E
2.4
2.5
2.6
2.7
2.7
2.9
2.9
3.1
3.3
4.4
4.8
5.5
5.8
6.1
6.2
SE
1.7
1.7
1.7
1.8
1.8
1.8
1.9
2.0
2.2
3.0
3.4
4.3
4.8
5.2
5.5
S
2.1
2.1
2.1
2.2
2.2
2.2
2.3
2.5
2.7
3.9
4.0
4.8
5.9
6.4
6.7
SW
2.5
2.6
2.6
2.7
2.7
2.7
2.8
2.9
3.2
4.9
5.5
11.4
11.4
11.5
11.5
NE
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.3
1.6
1.0
1.5
2.2
2.2
2.2
2.2
E
2.3
2.2
2.1
2.1
2.0
1.9
1.8
1.7
1.6
1.3
1.5
1.8
1.8
1.7
1.9
SE
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.7
2.6
2.2
2.2
2.1
2.1
S
SW
W
NW
2.2
3.6
1.0
1.4
2.2
3.6
1.0
1.4
2.2
3.6
1.0
1.4
2.2
3.6
1.0
1.4
2.2
3.6
1.0
1.5
2.2
3.6
1.0
1.5
2.2
3.5
1.1
1.6
2.2
3.4
1.1
1.7
2.2
2.7
1.2
1.9
2.7
1.1
1.0
2.0
2.7
1.0
1.0
2.2
2.1
1.0
1.9
2.1
2.1
1.0
1.8
2.1
2.1
1.3
1.5
2.2
2.1
1.5
1.7
2.2
Prepared by Metoc plc 1 April 2009
Spectral peakedness parameter gamma
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
1.4
1.4
1.4
1.4
1.5
1.5
1.6
1.7
1.9
2.0
2.2
1.9
1.8
1.5
1.7
N
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.6
2.0
2.2
2.1
2.2
2.2
2.2
W
5.8
5.9
5.9
5.9
6.0
6.0
6.1
6.2
6.3
11.7
11.7
11.7
11.8
11.8
11.8
NW
9.1
9.2
9.2
9.2
9.2
9.2
9.2
9.2
9.2
9.2
9.2
9.3
9.3
9.3
9.3
1-year June
SW Wave Hub Shore Export Cable - Metocean Design Basis
Notes
Intended for use in engineering design of seabed cable
Extreme Hs and Tz are generated by wave refraction model MIKE21
The model calculates the transformation to shore of extreme waves input at its offshore boundary
For waves moving offshore (e.g. from east) it calculates wind-generated wave growth
Other wave parameters are derived from Hs and Tz using industry-standard relationships:
Tp = 1.27*Tz
Hmax is calculated from Hs and Tz for 3 hr storm duration according to Rayleigh theory; limited to 0.78 depth
Lower Tmax/Tz ratio 1.05; Upper Tmax/Tz ratio 1.40; Central Tmax is same as Tp
Gamma derived fron Hs, Tp using formulation given in offshore standard DNV-OS-J101
Wave boundary inputs calculated from European Wave Model at 50.7°N 5.7°W Nov 1988 - Nov 2008
European model data (joint frequency tables) purchased under licence from UK Met Office
Wind inputs calculated from Seven Stones Light Vessel observations 50°6'9"N 6°6'0"W Sep 2001 - Jan 2009
Table A6 Wave criteria - Return Period 1 year - June
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p 3 of 3
Hs (m) at KP 24.5
Hs (m) at KP 15
N
N
NW
NE
10
15
NE
10
NW
5
5
W
N
15
15
NW
Hs (m) at KP 1.5
0
E
SW
SE
W
5
E
0
SW
SE
S
W
SW
SE
S
0.78 H/d breaking limit
Extreme significant wave height, Hs (m)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
2.9
3.0
3.0
3.0
3.0
3.1
3.1
3.2
3.4
3.5
3.6
5.6
5.5
5.3
5.4
N
2.8
2.8
2.8
2.8
2.8
2.8
2.8
2.9
2.9
3.2
3.3
3.3
3.3
3.3
3.3
1-year July
NE
0.5
0.5
0.6
0.6
0.6
0.6
0.6
0.7
0.8
1.5
1.8
2.1
2.1
2.1
2.1
E
0.2
0.3
0.3
0.3
0.3
0.3
0.3
0.4
0.4
0.7
0.9
1.2
1.4
1.5
1.6
SE
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.2
0.2
0.4
0.5
0.8
1.0
1.1
1.2
S
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.3
0.6
0.6
0.8
1.2
1.4
1.6
E
1.7
1.7
1.8
1.8
1.9
2.0
2.0
2.2
2.3
3.1
3.4
3.9
4.2
4.4
4.5
SE
1.2
1.2
1.2
1.2
1.2
1.3
1.3
1.4
1.5
2.0
2.3
3.0
3.4
3.6
3.8
S
SW
W
NW
1.4
1.7
4.1
6.3
1.4
1.8
4.1
6.4
1.5
1.8
4.2
6.4
1.5
1.8
4.2
6.4
1.5
1.9
4.2
6.4
1.5
1.9
4.2
6.4
1.6
1.9
4.3
6.4
1.7
2.0
4.4
6.4
1.9
2.2
4.5
6.4
2.5
3.3
8.2
6.4
2.7
3.7
8.2
6.4
3.1
7.9
8.3
6.4
3.8
7.9
8.3
6.4
4.1
7.9
8.3
6.4
4.4
7.9
8.3
6.4
Prepared by Metoc plc 1 April 2009
Mean zero-upcrossing wave period Tz (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
6.3
6.4
6.4
6.4
6.4
6.4
6.4
6.4
6.4
6.4
6.4
8.3
8.3
8.3
8.3
E
0
S
7 m Still water level above CD
NE
10
N
6.1
6.1
6.1
6.1
6.1
6.1
6.1
6.1
6.1
6.1
6.2
6.2
6.2
6.2
6.2
NE
3.3
3.3
3.3
3.3
3.2
3.2
3.2
3.2
3.2
4.9
4.9
4.9
4.9
4.9
4.9
SW
0.3
0.3
0.3
0.4
0.4
0.4
0.4
0.4
0.5
0.7
0.8
1.9
3.8
4.4
4.6
W
1.1
1.1
1.1
1.1
1.2
1.2
1.2
1.3
1.3
2.6
3.1
5.6
5.5
5.3
5.4
NW
2.9
3.0
3.0
3.0
3.0
3.1
3.1
3.2
3.4
3.5
3.6
3.5
3.5
3.6
3.6
1-year July
SW Wave Hub Shore Export Cable - Metocean Design Basis
Table A7 Wave criteria - Return Period 1 year - July
I:\P1209_JPKenny\R2056 metocean\App A.xls jul 09/04/2009 09:44
p 1 of 3
7 m Still water level above CD
0.78 H/d breaking limit
Period of peak spectral energy Tp (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
8.1
8.1
8.1
8.1
8.1
8.1
8.1
8.1
8.1
8.1
8.2
10.5
10.5
10.6
10.6
N
7.7
7.8
7.8
7.8
7.8
7.8
7.8
7.8
7.8
7.8
7.8
7.9
7.9
7.9
7.9
1-year July
NE
4.2
4.2
4.1
4.1
4.1
4.1
4.1
4.1
4.0
6.2
6.2
6.2
6.2
6.2
6.2
E
2.1
2.2
2.3
2.3
2.4
2.5
2.6
2.8
3.0
4.0
4.3
5.0
5.3
5.6
5.7
SE
1.5
1.5
1.5
1.5
1.6
1.6
1.7
1.8
1.9
2.6
3.0
3.8
4.3
4.6
4.9
S
1.8
1.8
1.9
1.9
1.9
2.0
2.0
2.2
2.4
3.2
3.4
4.0
4.8
5.3
5.5
SW
2.2
2.3
2.3
2.3
2.4
2.4
2.4
2.5
2.8
4.2
4.7
10.0
10.0
10.0
10.0
W
5.2
5.2
5.3
5.3
5.3
5.4
5.5
5.5
5.7
10.5
10.5
10.5
10.5
10.6
10.6
SE
0.2
0.3
0.3
0.3
0.3
0.3
0.3
0.4
0.4
0.8
1.1
1.6
2.0
2.2
2.5
S
0.4
0.4
0.4
0.4
0.4
0.4
0.5
0.5
0.6
1.2
1.3
1.7
2.4
2.8
3.1
SW
0.7
0.7
0.7
0.7
0.8
0.8
0.8
0.9
0.9
1.4
1.7
3.6
7.2
8.4
8.7
W
2.1
2.2
2.2
2.2
2.3
2.3
2.4
2.5
2.7
5.0
5.9
10.6
10.3
9.9
10.3
Maximum wave height in a 3-hour sea state Hmax (m)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
5.6
5.7
5.8
5.8
5.9
5.9
6.0
6.3
6.5
6.7
6.9
10.6
10.3
9.9
10.3
N
5.3
5.4
5.4
5.4
5.4
5.4
5.5
5.5
5.6
6.1
6.4
6.3
6.4
6.4
6.4
NE
1.1
1.1
1.1
1.1
1.2
1.2
1.3
1.4
1.5
2.9
3.5
4.1
4.0
4.0
4.0
E
0.5
0.5
0.6
0.6
0.6
0.7
0.7
0.8
0.8
1.4
1.7
2.4
2.8
3.0
3.2
1-year July
Period associated with max wave height - lower limit of Tmax (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
6.7
6.7
6.7
6.7
6.7
6.7
6.7
6.7
6.7
6.7
6.7
8.7
8.7
8.7
8.8
N
6.4
6.4
6.4
6.4
6.4
6.4
6.4
6.4
6.4
6.5
6.5
6.5
6.5
6.5
6.5
NE
3.4
3.4
3.4
3.4
3.4
3.4
3.4
3.4
3.3
5.1
5.1
5.1
5.1
5.1
5.1
E
1.7
1.8
1.9
1.9
2.0
2.1
2.1
2.3
2.5
3.3
3.6
4.1
4.4
4.6
4.7
NW
8.1
8.1
8.1
8.1
8.1
8.1
8.1
8.1
8.1
8.1
8.2
8.2
8.2
8.2
8.2
SE
1.2
1.2
1.3
1.3
1.3
1.3
1.4
1.5
1.6
2.1
2.4
3.1
3.5
3.8
4.0
NW
5.6
5.7
5.8
5.8
5.9
5.9
6.0
6.3
6.5
6.7
6.9
6.7
6.8
6.9
6.9
1-year July
S
SW
W
NW
1.5
1.8
4.3
6.7
1.5
1.9
4.3
6.7
1.5
1.9
4.4
6.7
1.6
1.9
4.4
6.7
1.6
1.9
4.4
6.7
1.6
2.0
4.4
6.7
1.7
2.0
4.5
6.7
1.8
2.1
4.6
6.7
1.9
2.3
4.7
6.7
2.7
3.5
8.6
6.7
2.8
3.9
8.7
6.7
3.3
8.3
8.7
6.7
4.0
8.3
8.7
6.8
4.4
8.3
8.7
6.8
4.6
8.3
8.8
6.8
Prepared by Metoc plc 1 April 2009
SW Wave Hub Shore Export Cable - Metocean Design Basis
Table A7 Wave criteria - Return Period 1 year - July
I:\P1209_JPKenny\R2056 metocean\App A.xls jul 09/04/2009 09:44
p 2 of 3
7 m Still water level above CD
0.78 H/d breaking limit
Period associated with max wave height - upper limit of Tmax (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
8.9
8.9
8.9
8.9
8.9
8.9
8.9
9.0
9.0
9.0
9.0
11.6
11.6
11.7
11.7
N
8.5
8.5
8.6
8.6
8.6
8.6
8.6
8.6
8.6
8.6
8.6
8.7
8.7
8.7
8.7
1-year July
NE
4.6
4.6
4.6
4.6
4.5
4.5
4.5
4.5
4.4
6.8
6.8
6.8
6.8
6.8
6.8
E
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.1
3.3
4.4
4.8
5.5
5.9
6.2
6.2
SE
1.6
1.6
1.7
1.7
1.7
1.8
1.8
1.9
2.1
2.8
3.3
4.2
4.7
5.1
5.4
S
2.0
2.0
2.1
2.1
2.1
2.2
2.2
2.4
2.6
3.6
3.8
4.4
5.3
5.8
6.1
SW
2.4
2.5
2.5
2.6
2.6
2.6
2.7
2.8
3.1
4.7
5.2
11.0
11.0
11.0
11.0
W
5.7
5.8
5.8
5.9
5.9
5.9
6.0
6.1
6.2
11.5
11.5
11.6
11.6
11.7
11.7
NE
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.1
1.5
1.0
1.6
2.3
2.2
2.2
2.2
E
2.3
2.2
2.1
2.0
1.9
1.8
1.8
1.6
1.5
1.3
1.4
1.8
1.8
1.7
1.9
SE
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.9
2.7
2.2
2.2
2.1
2.1
S
SW
W
NW
2.2
3.6
1.0
1.4
2.2
3.6
1.0
1.4
2.2
3.6
1.0
1.4
2.2
3.6
1.0
1.5
2.2
3.6
1.0
1.5
2.2
3.6
1.0
1.5
2.2
3.6
1.1
1.6
2.2
3.4
1.1
1.8
2.2
2.7
1.2
1.9
2.4
1.0
1.0
2.0
2.1
1.0
1.0
2.2
2.0
1.0
1.9
2.1
2.0
1.0
1.7
2.1
2.0
1.3
1.6
2.2
2.0
1.5
1.7
2.2
Prepared by Metoc plc 1 April 2009
Spectral peakedness parameter gamma
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
1.4
1.4
1.4
1.5
1.5
1.5
1.6
1.8
1.9
2.0
2.2
1.9
1.7
1.6
1.7
N
1.5
1.5
1.5
1.5
1.5
1.5
1.6
1.6
1.6
2.0
2.2
2.1
2.2
2.2
2.2
NW
8.9
8.9
8.9
8.9
8.9
8.9
8.9
9.0
9.0
9.0
9.0
9.0
9.0
9.0
9.0
1-year July
SW Wave Hub Shore Export Cable - Metocean Design Basis
Notes
Intended for use in engineering design of seabed cable
Extreme Hs and Tz are generated by wave refraction model MIKE21
The model calculates the transformation to shore of extreme waves input at its offshore boundary
For waves moving offshore (e.g. from east) it calculates wind-generated wave growth
Other wave parameters are derived from Hs and Tz using industry-standard relationships:
Tp = 1.27*Tz
Hmax is calculated from Hs and Tz for 3 hr storm duration according to Rayleigh theory; limited to 0.78 depth
Lower Tmax/Tz ratio 1.05; Upper Tmax/Tz ratio 1.40; Central Tmax is same as Tp
Gamma derived fron Hs, Tp using formulation given in offshore standard DNV-OS-J101
Wave boundary inputs calculated from European Wave Model at 50.7°N 5.7°W Nov 1988 - Nov 2008
European model data (joint frequency tables) purchased under licence from UK Met Office
Wind inputs calculated from Seven Stones Light Vessel observations 50°6'9"N 6°6'0"W Sep 2001 - Jan 2009
Table A7 Wave criteria - Return Period 1 year - July
I:\P1209_JPKenny\R2056 metocean\App A.xls jul 09/04/2009 09:44
p 3 of 3
Hs (m) at KP 24.5
Hs (m) at KP 15
N
N
NW
NE
10
15
NE
10
NW
5
5
W
N
15
15
NW
Hs (m) at KP 1.5
0
E
SW
SE
W
5
E
0
SW
SE
S
W
SW
SE
S
0.78 H/d breaking limit
Extreme significant wave height, Hs (m)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
2.9
2.9
3.0
3.0
3.0
3.0
3.1
3.2
3.3
3.4
3.6
6.0
5.8
5.5
5.8
N
2.7
2.7
2.7
2.7
2.7
2.8
2.8
2.8
2.8
3.1
3.2
3.2
3.2
3.2
3.2
1-year August
NE
0.8
0.8
0.8
0.9
0.9
0.9
0.9
1.0
1.1
1.8
2.4
2.8
2.8
2.8
2.8
E
0.2
0.3
0.3
0.3
0.3
0.3
0.3
0.4
0.4
0.7
0.9
1.3
1.4
1.6
1.7
SE
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.2
0.2
0.4
0.5
0.7
0.9
1.0
1.2
S
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.3
0.6
0.7
0.9
1.3
1.5
1.7
E
1.7
1.7
1.8
1.9
1.9
2.0
2.1
2.2
2.4
3.2
3.5
4.0
4.2
4.5
4.5
SE
1.1
1.2
1.2
1.2
1.2
1.2
1.3
1.4
1.5
1.9
2.2
2.9
3.3
3.5
3.7
S
SW
W
NW
1.4
1.8
4.1
6.3
1.4
1.9
4.1
6.4
1.4
1.9
4.1
6.4
1.5
1.9
4.1
6.4
1.5
1.9
4.2
6.4
1.5
2.0
4.2
6.4
1.6
2.0
4.3
6.4
1.7
2.1
4.3
6.4
1.8
2.3
4.4
6.4
2.5
3.5
8.5
6.4
2.6
3.9
8.5
6.4
3.2
8.2
8.5
6.4
4.0
8.2
8.6
6.4
4.3
8.2
8.6
6.4
4.5
8.2
8.6
6.4
Prepared by Metoc plc 1 April 2009
Mean zero-upcrossing wave period Tz (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
6.3
6.4
6.4
6.4
6.4
6.4
6.4
6.4
6.4
6.4
6.4
8.5
8.6
8.6
8.6
E
0
S
7 m Still water level above CD
NE
10
N
6.0
6.0
6.0
6.0
6.0
6.1
6.1
6.1
6.1
6.1
6.1
6.1
6.1
6.1
6.1
NE
3.8
3.8
3.8
3.8
3.8
3.8
3.8
3.7
3.7
5.7
5.7
5.7
5.7
5.7
5.7
SW
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.5
0.5
0.8
1.0
2.0
4.1
4.8
5.0
W
1.1
1.1
1.1
1.1
1.1
1.1
1.2
1.2
1.3
2.8
3.3
6.0
5.8
5.5
5.8
NW
2.9
2.9
3.0
3.0
3.0
3.0
3.1
3.2
3.3
3.4
3.6
3.5
3.5
3.5
3.6
1-year August
SW Wave Hub Shore Export Cable - Metocean Design Basis
Table A8 Wave criteria - Return Period 1 year - August
I:\P1209_JPKenny\R2056 metocean\App A.xls aug 09/04/2009 09:44
p 1 of 3
7 m Still water level above CD
0.78 H/d breaking limit
Period of peak spectral energy Tp (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
8.0
8.1
8.1
8.1
8.1
8.1
8.1
8.1
8.1
8.1
8.1
10.8
10.9
10.9
10.9
N
7.6
7.7
7.7
7.7
7.7
7.7
7.7
7.7
7.7
7.7
7.7
7.8
7.8
7.8
7.8
1-year August
NE
4.9
4.9
4.8
4.8
4.8
4.8
4.8
4.7
4.7
7.2
7.2
7.2
7.2
7.2
7.2
E
2.1
2.2
2.3
2.4
2.5
2.6
2.6
2.8
3.0
4.0
4.4
5.1
5.4
5.7
5.7
SE
1.4
1.5
1.5
1.5
1.6
1.6
1.6
1.7
1.9
2.4
2.8
3.7
4.1
4.5
4.7
S
1.8
1.8
1.8
1.9
1.9
1.9
2.0
2.1
2.3
3.1
3.3
4.1
5.0
5.4
5.7
SW
2.3
2.4
2.4
2.4
2.5
2.5
2.6
2.7
2.9
4.4
5.0
10.4
10.4
10.5
10.5
SE
0.2
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.4
0.7
1.0
1.4
1.8
2.1
2.3
S
0.4
0.4
0.4
0.4
0.4
0.4
0.5
0.5
0.6
1.2
1.3
1.8
2.6
3.0
3.3
SW
0.7
0.8
0.8
0.8
0.8
0.9
0.9
0.9
1.0
1.6
1.9
3.8
7.8
9.1
9.5
Maximum wave height in a 3-hour sea state Hmax (m)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
5.6
5.7
5.7
5.8
5.8
5.9
6.0
6.2
6.4
6.6
6.9
11.3
11.0
10.5
10.9
N
5.2
5.3
5.3
5.3
5.3
5.4
5.4
5.4
5.5
6.0
6.2
6.2
6.2
6.3
6.3
NE
1.6
1.7
1.7
1.7
1.8
1.8
1.9
2.0
2.2
3.6
4.6
5.5
5.5
5.5
5.5
E
0.5
0.6
0.6
0.6
0.6
0.7
0.7
0.8
0.9
1.4
1.8
2.5
2.9
3.1
3.3
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
6.6
6.7
6.7
6.7
6.7
6.7
6.7
6.7
6.7
6.7
6.7
8.9
9.0
9.0
9.0
N
6.3
6.3
6.3
6.3
6.4
6.4
6.4
6.4
6.4
6.4
6.4
6.4
6.4
6.4
6.4
NE
4.0
4.0
4.0
4.0
4.0
4.0
4.0
3.9
3.9
6.0
6.0
6.0
6.0
6.0
6.0
E
1.8
1.8
1.9
2.0
2.0
2.1
2.2
2.3
2.5
3.3
3.6
4.2
4.4
4.7
4.7
NW
8.0
8.1
8.1
8.1
8.1
8.1
8.1
8.1
8.1
8.1
8.1
8.1
8.1
8.1
8.1
1-year August
Period associated with max wave height - lower limit of Tmax (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
W
5.2
5.2
5.2
5.3
5.3
5.3
5.4
5.5
5.6
10.8
10.8
10.8
10.9
10.9
10.9
SE
1.2
1.2
1.2
1.3
1.3
1.3
1.4
1.4
1.6
2.0
2.3
3.0
3.4
3.7
3.9
W
2.1
2.1
2.2
2.2
2.2
2.3
2.4
2.5
2.6
5.3
6.2
11.3
11.0
10.5
10.9
NW
5.6
5.7
5.7
5.8
5.8
5.9
6.0
6.2
6.4
6.6
6.9
6.7
6.8
6.8
6.9
1-year August
S
SW
W
NW
1.5
1.9
4.3
6.6
1.5
1.9
4.3
6.7
1.5
2.0
4.3
6.7
1.6
2.0
4.4
6.7
1.6
2.0
4.4
6.7
1.6
2.1
4.4
6.7
1.7
2.1
4.5
6.7
1.8
2.2
4.5
6.7
1.9
2.4
4.6
6.7
2.6
3.6
8.9
6.7
2.8
4.1
8.9
6.7
3.4
8.6
8.9
6.7
4.2
8.6
9.0
6.7
4.5
8.6
9.0
6.7
4.7
8.7
9.0
6.7
Prepared by Metoc plc 1 April 2009
SW Wave Hub Shore Export Cable - Metocean Design Basis
Table A8 Wave criteria - Return Period 1 year - August
I:\P1209_JPKenny\R2056 metocean\App A.xls aug 09/04/2009 09:44
p 2 of 3
7 m Still water level above CD
0.78 H/d breaking limit
Period associated with max wave height - upper limit of Tmax (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
8.9
8.9
8.9
8.9
8.9
8.9
8.9
8.9
8.9
8.9
9.0
11.9
12.0
12.0
12.0
N
8.4
8.5
8.5
8.5
8.5
8.5
8.5
8.5
8.5
8.5
8.5
8.6
8.6
8.6
8.6
1-year August
NE
5.4
5.4
5.3
5.3
5.3
5.3
5.3
5.2
5.2
7.9
7.9
8.0
8.0
8.0
8.0
E
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.1
3.3
4.5
4.9
5.6
5.9
6.2
6.3
SE
1.6
1.6
1.7
1.7
1.7
1.7
1.8
1.9
2.1
2.7
3.1
4.0
4.6
4.9
5.2
S
2.0
2.0
2.0
2.1
2.1
2.1
2.2
2.3
2.6
3.4
3.7
4.5
5.5
6.0
6.3
SW
2.6
2.6
2.6
2.7
2.7
2.8
2.8
2.9
3.2
4.9
5.5
11.5
11.5
11.5
11.5
NE
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.3
1.7
1.0
1.4
2.2
2.2
2.2
2.2
E
2.3
2.2
2.1
2.0
1.9
1.8
1.8
1.7
1.6
1.3
1.4
1.8
1.8
1.7
1.9
SE
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.9
2.7
2.1
2.1
2.1
2.0
S
SW
W
NW
2.2
3.6
1.0
1.4
2.2
3.6
1.0
1.4
2.2
3.6
1.0
1.4
2.2
3.6
1.0
1.5
2.2
3.6
1.0
1.5
2.2
3.6
1.0
1.5
2.2
3.5
1.1
1.6
2.2
3.4
1.1
1.8
2.2
2.7
1.1
1.9
2.9
1.1
1.0
2.0
2.8
1.0
1.0
2.2
2.0
1.0
2.0
2.1
1.9
1.0
1.8
2.1
2.0
1.3
1.5
2.2
2.0
1.5
1.7
2.2
Prepared by Metoc plc 1 April 2009
Spectral peakedness parameter gamma
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
1.4
1.4
1.4
1.5
1.5
1.5
1.6
1.8
1.9
2.0
2.2
2.0
1.8
1.5
1.7
N
1.5
1.5
1.5
1.5
1.5
1.5
1.6
1.6
1.7
2.0
2.2
2.1
2.2
2.2
2.2
W
5.7
5.7
5.8
5.8
5.8
5.9
6.0
6.1
6.2
11.9
11.9
11.9
12.0
12.0
12.0
NW
8.9
8.9
8.9
8.9
8.9
8.9
8.9
8.9
8.9
8.9
9.0
9.0
9.0
9.0
9.0
1-year August
SW Wave Hub Shore Export Cable - Metocean Design Basis
Notes
Intended for use in engineering design of seabed cable
Extreme Hs and Tz are generated by wave refraction model MIKE21
The model calculates the transformation to shore of extreme waves input at its offshore boundary
For waves moving offshore (e.g. from east) it calculates wind-generated wave growth
Other wave parameters are derived from Hs and Tz using industry-standard relationships:
Tp = 1.27*Tz
Hmax is calculated from Hs and Tz for 3 hr storm duration according to Rayleigh theory; limited to 0.78 depth
Lower Tmax/Tz ratio 1.05; Upper Tmax/Tz ratio 1.40; Central Tmax is same as Tp
Gamma derived fron Hs, Tp using formulation given in offshore standard DNV-OS-J101
Wave boundary inputs calculated from European Wave Model at 50.7°N 5.7°W Nov 1988 - Nov 2008
European model data (joint frequency tables) purchased under licence from UK Met Office
Wind inputs calculated from Seven Stones Light Vessel observations 50°6'9"N 6°6'0"W Sep 2001 - Jan 2009
Table A8 Wave criteria - Return Period 1 year - August
I:\P1209_JPKenny\R2056 metocean\App A.xls aug 09/04/2009 09:44
p 3 of 3
Hs (m) at KP 24.5
Hs (m) at KP 15
N
N
NW
NE
10
15
NE
10
NW
5
5
W
N
15
15
NW
Hs (m) at KP 1.5
0
E
SW
SE
W
5
E
0
SW
W
SE
S
SW
SE
S
0.78 H/d breaking limit
Extreme significant wave height, Hs (m)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
3.7
3.8
3.8
3.8
3.9
3.9
4.0
4.1
4.3
4.5
4.7
8.3
8.1
7.3
7.8
N
2.9
2.9
2.9
2.9
2.9
2.9
2.9
3.0
3.0
3.2
3.3
3.3
3.4
3.4
3.4
1-year September
NE
1.1
1.1
1.1
1.1
1.1
1.2
1.2
1.3
1.3
2.2
2.8
3.4
3.4
3.4
3.5
E
0.3
0.3
0.3
0.4
0.4
0.4
0.4
0.4
0.5
0.9
1.2
1.7
1.9
2.1
2.2
SE
0.1
0.1
0.1
0.1
0.1
0.1
0.2
0.2
0.2
0.5
0.7
1.0
1.2
1.4
1.6
S
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.3
0.3
0.7
0.8
1.0
1.5
1.7
1.9
E
1.8
1.9
1.9
1.9
2.0
2.1
2.1
2.2
2.4
3.5
3.9
4.6
4.8
5.1
5.2
SE
1.2
1.2
1.2
1.2
1.3
1.3
1.3
1.4
1.5
2.4
2.7
3.3
3.8
4.1
4.3
S
SW
W
NW
1.4
2.0
4.4
7.1
1.5
2.1
4.4
7.2
1.5
2.1
4.5
7.2
1.5
2.1
4.5
7.2
1.5
2.2
4.5
7.2
1.6
2.2
4.5
7.2
1.6
2.2
4.6
7.2
1.7
2.3
4.7
7.2
1.9
2.6
4.8
7.2
2.7
3.7
9.7
7.3
2.8
4.2
9.7
7.3
3.4
9.2
9.8
7.3
4.2
9.2
9.9
7.3
4.5
9.2
10.0
7.3
4.8
9.2
10.0
7.3
Prepared by Metoc plc 1 April 2009
Mean zero-upcrossing wave period Tz (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
7.1
7.2
7.2
7.2
7.2
7.2
7.2
7.2
7.2
7.3
7.3
9.8
9.9
10.0
10.0
E
0
S
8 m Still water level above CD
NE
10
N
6.2
6.2
6.2
6.2
6.2
6.2
6.2
6.2
6.2
6.2
6.2
6.2
6.2
6.2
6.2
NE
4.2
4.2
4.2
4.2
4.2
4.2
4.2
4.1
4.1
6.3
6.3
6.3
6.3
6.3
6.3
SW
0.4
0.5
0.5
0.5
0.5
0.5
0.5
0.6
0.6
1.0
1.1
2.6
5.1
5.9
6.2
W
1.3
1.3
1.3
1.3
1.3
1.4
1.4
1.5
1.6
3.9
4.4
8.3
8.1
7.3
7.8
NW
3.7
3.8
3.8
3.8
3.9
3.9
4.0
4.1
4.3
4.5
4.7
4.4
4.5
4.6
4.6
1-year September
SW Wave Hub Shore Export Cable - Metocean Design Basis
Table A9 Wave criteria - Return Period 1 year - September
I:\P1209_JPKenny\R2056 metocean\App A.xls sep 09/04/2009 09:44
p 1 of 3
8 m Still water level above CD
0.78 H/d breaking limit
Period of peak spectral energy Tp (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
9.0
9.1
9.1
9.1
9.2
9.2
9.2
9.2
9.2
9.2
9.2
12.4
12.6
12.7
12.8
N
7.8
7.8
7.9
7.9
7.9
7.9
7.9
7.9
7.9
7.9
7.9
7.9
7.9
7.9
7.9
1-year September
NE
5.4
5.4
5.4
5.3
5.3
5.3
5.3
5.3
5.2
8.0
8.0
8.0
8.0
8.0
8.0
E
2.3
2.4
2.4
2.5
2.5
2.6
2.7
2.8
3.1
4.5
5.0
5.8
6.2
6.5
6.6
SE
1.5
1.5
1.5
1.6
1.6
1.6
1.7
1.8
1.9
3.1
3.4
4.2
4.8
5.2
5.4
S
1.8
1.8
1.9
1.9
1.9
2.0
2.0
2.2
2.4
3.4
3.6
4.4
5.3
5.8
6.1
SW
2.6
2.6
2.7
2.7
2.8
2.8
2.9
3.0
3.3
4.7
5.4
11.6
11.6
11.7
11.7
SE
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.4
0.4
1.1
1.3
2.0
2.5
2.8
3.1
S
0.4
0.4
0.4
0.4
0.4
0.4
0.5
0.5
0.6
1.4
1.6
2.0
2.9
3.4
3.8
SW
0.9
0.9
1.0
1.0
1.0
1.1
1.1
1.2
1.3
1.9
2.3
4.8
9.5
11.1
11.7
Maximum wave height in a 3-hour sea state Hmax (m)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
7.0
7.2
7.3
7.3
7.4
7.5
7.6
7.9
8.3
8.5
8.9
15.5
15.1
13.6
14.5
N
5.5
5.5
5.6
5.6
5.6
5.6
5.7
5.7
5.8
6.3
6.5
6.4
6.5
6.5
6.5
NE
2.1
2.1
2.2
2.2
2.3
2.3
2.3
2.5
2.7
4.2
5.5
6.6
6.6
6.6
6.7
E
0.6
0.7
0.7
0.7
0.8
0.8
0.8
0.9
1.0
1.9
2.3
3.4
3.8
4.1
4.4
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
7.5
7.5
7.6
7.6
7.6
7.6
7.6
7.6
7.6
7.6
7.6
10.3
10.4
10.5
10.5
N
6.5
6.5
6.5
6.5
6.5
6.5
6.5
6.5
6.5
6.5
6.5
6.6
6.6
6.6
6.6
NE
4.5
4.4
4.4
4.4
4.4
4.4
4.4
4.3
4.3
6.6
6.6
6.6
6.6
6.6
6.6
E
1.9
1.9
2.0
2.0
2.1
2.2
2.2
2.4
2.5
3.7
4.1
4.8
5.1
5.4
5.4
NW
9.0
9.1
9.1
9.1
9.2
9.2
9.2
9.2
9.2
9.2
9.2
9.3
9.3
9.3
9.3
1-year September
Period associated with max wave height - lower limit of Tmax (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
W
5.6
5.6
5.7
5.7
5.7
5.8
5.9
5.9
6.1
12.3
12.4
12.4
12.6
12.7
12.8
SE
1.2
1.2
1.3
1.3
1.3
1.3
1.4
1.5
1.6
2.6
2.8
3.5
3.9
4.3
4.5
W
2.5
2.5
2.6
2.6
2.6
2.7
2.8
2.9
3.1
7.3
8.3
15.5
15.1
13.6
14.5
NW
7.0
7.2
7.3
7.3
7.4
7.5
7.6
7.9
8.3
8.5
8.9
8.4
8.6
8.8
8.8
1-year September
S
SW
W
NW
1.5
2.1
4.6
7.5
1.5
2.2
4.7
7.5
1.6
2.2
4.7
7.6
1.6
2.2
4.7
7.6
1.6
2.3
4.7
7.6
1.6
2.3
4.8
7.6
1.7
2.4
4.8
7.6
1.8
2.4
4.9
7.6
2.0
2.7
5.0
7.6
2.8
3.9
10.2
7.6
3.0
4.4
10.2
7.6
3.6
9.6
10.3
7.7
4.4
9.6
10.4
7.7
4.8
9.6
10.5
7.7
5.0
9.7
10.5
7.7
Prepared by Metoc plc 1 April 2009
SW Wave Hub Shore Export Cable - Metocean Design Basis
Table A9 Wave criteria - Return Period 1 year - September
I:\P1209_JPKenny\R2056 metocean\App A.xls sep 09/04/2009 09:44
p 2 of 3
8 m Still water level above CD
0.78 H/d breaking limit
Period associated with max wave height - upper limit of Tmax (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
10.0
10.0
10.1
10.1
10.1
10.1
10.1
10.1
10.1
10.2
10.2
13.7
13.9
14.0
14.1
N
8.6
8.7
8.7
8.7
8.7
8.7
8.7
8.7
8.7
8.7
8.7
8.7
8.7
8.7
8.7
1-year September
NE
5.9
5.9
5.9
5.9
5.9
5.9
5.8
5.8
5.7
8.8
8.8
8.8
8.8
8.8
8.8
E
2.5
2.6
2.7
2.7
2.8
2.9
2.9
3.1
3.4
5.0
5.5
6.4
6.8
7.2
7.2
SE
1.6
1.7
1.7
1.7
1.8
1.8
1.8
2.0
2.1
3.4
3.8
4.7
5.3
5.7
6.0
S
2.0
2.0
2.1
2.1
2.1
2.2
2.3
2.4
2.6
3.7
4.0
4.8
5.9
6.3
6.7
SW
2.8
2.9
2.9
3.0
3.0
3.1
3.1
3.3
3.6
5.2
5.9
12.8
12.8
12.9
12.9
NE
1.0
1.0
1.0
1.0
1.0
1.1
1.2
1.4
1.8
1.0
1.4
2.1
2.1
2.2
2.2
E
2.8
2.7
2.7
2.7
2.6
2.6
2.5
2.4
2.2
1.5
1.6
1.9
2.0
1.8
2.0
SE
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.5
2.5
2.3
2.3
2.1
2.1
S
SW
W
NW
2.2
3.6
1.0
1.4
2.2
3.6
1.0
1.4
2.2
3.6
1.0
1.4
2.2
3.6
1.1
1.5
2.2
3.6
1.1
1.5
2.2
3.6
1.1
1.5
2.2
3.5
1.1
1.6
2.2
3.4
1.1
1.8
2.2
2.7
1.2
2.0
2.9
1.2
1.0
2.1
2.8
1.0
1.0
2.3
2.1
1.0
2.2
2.0
2.0
1.0
1.9
2.0
2.1
1.2
1.4
2.2
2.1
1.4
1.6
2.2
Prepared by Metoc plc 1 April 2009
Spectral peakedness parameter gamma
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
1.4
1.4
1.4
1.5
1.5
1.5
1.6
1.8
2.0
2.1
2.3
2.2
1.9
1.4
1.6
N
1.5
1.5
1.5
1.6
1.6
1.6
1.6
1.7
1.7
2.0
2.2
2.1
2.2
2.2
2.2
W
6.2
6.2
6.3
6.3
6.3
6.4
6.5
6.5
6.7
13.6
13.6
13.7
13.9
14.0
14.1
NW
10.0
10.0
10.1
10.1
10.1
10.1
10.1
10.1
10.1
10.2
10.2
10.2
10.2
10.2
10.2
1-year September
SW Wave Hub Shore Export Cable - Metocean Design Basis
Notes
Intended for use in engineering design of seabed cable
Extreme Hs and Tz are generated by wave refraction model MIKE21
The model calculates the transformation to shore of extreme waves input at its offshore boundary
For waves moving offshore (e.g. from east) it calculates wind-generated wave growth
Other wave parameters are derived from Hs and Tz using industry-standard relationships:
Tp = 1.27*Tz
Hmax is calculated from Hs and Tz for 3 hr storm duration according to Rayleigh theory; limited to 0.78 depth
Lower Tmax/Tz ratio 1.05; Upper Tmax/Tz ratio 1.40; Central Tmax is same as Tp
Gamma derived fron Hs, Tp using formulation given in offshore standard DNV-OS-J101
Wave boundary inputs calculated from European Wave Model at 50.7°N 5.7°W Nov 1988 - Nov 2008
European model data (joint frequency tables) purchased under licence from UK Met Office
Wind inputs calculated from Seven Stones Light Vessel observations 50°6'9"N 6°6'0"W Sep 2001 - Jan 2009
Table A9 Wave criteria - Return Period 1 year - September
I:\P1209_JPKenny\R2056 metocean\App A.xls sep 09/04/2009 09:44
p 3 of 3
Hs (m) at KP 24.5
Hs (m) at KP 15
N
N
NW
NE
10
15
NE
10
NW
5
5
W
N
15
15
NW
Hs (m) at KP 1.5
0
E
SW
SE
W
5
E
0
SW
SE
S
W
SW
SE
S
0.78 H/d breaking limit
Extreme significant wave height, Hs (m)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
4.1
4.2
4.3
4.3
4.4
4.4
4.5
4.7
4.9
5.1
5.3
8.6
8.4
7.5
8.0
N
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.4
3.4
3.7
3.9
3.9
3.9
3.9
4.0
1-year October
NE
1.1
1.1
1.1
1.2
1.2
1.2
1.2
1.3
1.4
2.3
2.9
3.5
3.5
3.6
3.6
E
0.3
0.4
0.4
0.4
0.4
0.4
0.5
0.5
0.6
0.9
1.2
1.7
2.0
2.2
2.3
SE
0.1
0.1
0.1
0.2
0.2
0.2
0.2
0.2
0.2
0.6
0.7
1.0
1.3
1.5
1.7
S
0.2
0.2
0.2
0.2
0.2
0.2
0.3
0.3
0.4
0.8
0.8
1.1
1.7
2.0
2.2
E
1.9
2.0
2.0
2.1
2.2
2.3
2.3
2.5
2.7
3.6
4.0
4.6
4.9
5.2
5.2
SE
1.3
1.3
1.3
1.3
1.4
1.4
1.4
1.5
1.7
2.4
2.7
3.5
3.9
4.2
4.4
S
SW
W
NW
1.5
2.1
4.6
7.4
1.6
2.1
4.7
7.5
1.6
2.2
4.7
7.6
1.6
2.2
4.7
7.6
1.7
2.2
4.7
7.6
1.7
2.2
4.8
7.6
1.7
2.3
4.8
7.6
1.9
2.4
4.9
7.6
2.0
2.6
5.0
7.7
2.8
3.8
9.8
7.7
2.9
4.3
9.9
7.7
3.6
9.4
9.9
7.8
4.4
9.4
10.1
7.8
4.8
9.4
10.2
7.8
5.0
9.4
10.2
7.8
Prepared by Metoc plc 1 April 2009
Mean zero-upcrossing wave period Tz (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
7.4
7.5
7.6
7.6
7.6
7.6
7.6
7.6
7.7
7.7
7.7
9.9
10.1
10.2
10.2
E
0
S
8 m Still water level above CD
NE
10
N
6.6
6.6
6.7
6.7
6.7
6.7
6.7
6.7
6.7
6.7
6.7
6.8
6.8
6.8
6.8
NE
4.3
4.3
4.3
4.3
4.3
4.3
4.2
4.2
4.2
6.4
6.4
6.4
6.4
6.4
6.4
SW
0.5
0.5
0.5
0.5
0.5
0.5
0.6
0.6
0.6
1.0
1.2
2.7
5.3
6.2
6.5
W
1.4
1.4
1.5
1.5
1.5
1.5
1.6
1.6
1.7
4.0
4.6
8.6
8.4
7.5
8.0
NW
4.1
4.2
4.3
4.3
4.4
4.4
4.5
4.7
4.9
5.1
5.3
5.0
5.0
5.2
5.2
1-year October
SW Wave Hub Shore Export Cable - Metocean Design Basis
Table A10 Wave criteria - Return Period 1 year - October
I:\P1209_JPKenny\R2056 metocean\App A.xls oct 09/04/2009 09:44
p 1 of 3
8 m Still water level above CD
0.78 H/d breaking limit
Period of peak spectral energy Tp (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
9.4
9.6
9.6
9.7
9.7
9.7
9.7
9.7
9.7
9.8
9.8
12.6
12.8
12.9
13.0
N
8.4
8.4
8.5
8.5
8.5
8.5
8.5
8.5
8.5
8.5
8.6
8.6
8.6
8.6
8.6
1-year October
NE
5.5
5.5
5.5
5.4
5.4
5.4
5.4
5.3
5.3
8.1
8.1
8.1
8.2
8.2
8.2
E
2.4
2.5
2.6
2.7
2.7
2.9
2.9
3.1
3.4
4.6
5.0
5.8
6.2
6.6
6.6
SE
1.6
1.6
1.7
1.7
1.7
1.8
1.8
1.9
2.1
3.0
3.4
4.4
5.0
5.3
5.6
S
2.0
2.0
2.0
2.1
2.1
2.1
2.2
2.4
2.6
3.5
3.7
4.6
5.6
6.1
6.4
SW
2.6
2.7
2.7
2.8
2.8
2.9
2.9
3.0
3.3
4.8
5.5
11.9
11.9
11.9
12.0
SE
0.3
0.3
0.3
0.3
0.3
0.4
0.4
0.4
0.5
1.1
1.4
2.1
2.7
3.0
3.4
S
0.4
0.5
0.5
0.5
0.5
0.5
0.6
0.6
0.7
1.5
1.7
2.2
3.3
3.9
4.3
SW
1.0
1.0
1.0
1.1
1.1
1.1
1.2
1.2
1.3
2.0
2.4
5.1
10.0
11.6
12.3
Maximum wave height in a 3-hour sea state Hmax (m)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
7.0
7.8
8.2
8.2
8.3
8.4
8.6
8.9
9.3
9.7
10.1
16.0
15.6
14.1
15.0
N
6.3
6.3
6.4
6.4
6.4
6.4
6.4
6.5
6.5
7.2
7.4
7.4
7.6
7.6
7.6
NE
2.2
2.2
2.3
2.3
2.4
2.4
2.4
2.6
2.8
4.4
5.6
6.8
6.8
6.9
6.9
E
0.7
0.7
0.8
0.8
0.8
0.9
0.9
1.1
1.2
1.9
2.4
3.4
3.9
4.2
4.4
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
7.8
7.9
8.0
8.0
8.0
8.0
8.0
8.0
8.0
8.1
8.1
10.4
10.6
10.7
10.7
N
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.1
7.1
7.1
7.1
7.1
NE
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.4
4.4
6.7
6.7
6.7
6.7
6.7
6.7
E
2.0
2.1
2.1
2.2
2.3
2.4
2.4
2.6
2.8
3.8
4.2
4.8
5.1
5.4
5.5
NW
9.4
9.6
9.6
9.7
9.7
9.7
9.7
9.7
9.7
9.8
9.8
9.8
9.9
9.9
9.9
1-year October
Period associated with max wave height - lower limit of Tmax (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
W
5.9
5.9
6.0
6.0
6.0
6.1
6.2
6.2
6.4
12.5
12.5
12.6
12.8
12.9
13.0
SE
1.3
1.4
1.4
1.4
1.4
1.5
1.5
1.6
1.7
2.5
2.8
3.7
4.1
4.4
4.7
W
2.8
2.8
2.9
2.9
2.9
3.0
3.1
3.2
3.4
7.6
8.6
16.0
15.6
14.1
15.0
NW
7.0
7.8
8.2
8.2
8.3
8.4
8.6
8.9
9.3
9.7
10.1
9.4
9.5
9.9
10.0
1-year October
S
SW
W
NW
1.6
2.2
4.9
7.8
1.7
2.2
4.9
7.9
1.7
2.3
4.9
8.0
1.7
2.3
5.0
8.0
1.7
2.3
5.0
8.0
1.8
2.4
5.0
8.0
1.8
2.4
5.1
8.0
1.9
2.5
5.2
8.0
2.1
2.8
5.3
8.0
2.9
4.0
10.3
8.1
3.1
4.5
10.4
8.1
3.8
9.8
10.4
8.1
4.6
9.8
10.6
8.2
5.0
9.9
10.7
8.2
5.3
9.9
10.7
8.2
Prepared by Metoc plc 1 April 2009
SW Wave Hub Shore Export Cable - Metocean Design Basis
Table A10 Wave criteria - Return Period 1 year - October
I:\P1209_JPKenny\R2056 metocean\App A.xls oct 09/04/2009 09:44
p 2 of 3
8 m Still water level above CD
0.78 H/d breaking limit
Period associated with max wave height - upper limit of Tmax (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
10.4
10.6
10.6
10.7
10.7
10.7
10.7
10.7
10.7
10.8
10.8
13.9
14.1
14.2
14.3
N
9.3
9.3
9.3
9.3
9.3
9.3
9.3
9.3
9.3
9.4
9.4
9.5
9.5
9.5
9.5
1-year October
NE
6.1
6.0
6.0
6.0
6.0
6.0
5.9
5.9
5.9
8.9
8.9
9.0
9.0
9.0
9.0
E
2.7
2.8
2.8
2.9
3.0
3.2
3.2
3.5
3.7
5.0
5.6
6.4
6.9
7.2
7.3
SE
1.8
1.8
1.8
1.9
1.9
1.9
2.0
2.1
2.3
3.3
3.8
4.9
5.5
5.9
6.2
S
2.2
2.2
2.2
2.3
2.3
2.4
2.4
2.6
2.8
3.9
4.1
5.0
6.2
6.7
7.1
SW
2.9
3.0
3.0
3.1
3.1
3.1
3.2
3.3
3.7
5.3
6.1
13.1
13.1
13.2
13.2
NE
1.0
1.0
1.0
1.0
1.1
1.1
1.2
1.5
1.8
1.0
1.3
2.1
2.1
2.2
2.2
E
2.6
2.5
2.5
2.4
2.3
2.2
2.2
2.0
1.8
1.4
1.6
1.9
2.0
1.8
2.0
SE
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
3.0
2.8
2.1
2.3
2.2
2.2
S
SW
W
NW
2.2
3.6
1.0
1.5
2.2
3.6
1.1
1.5
2.2
3.6
1.1
1.5
2.2
3.6
1.1
1.5
2.2
3.6
1.1
1.5
2.2
3.6
1.1
1.6
2.2
3.5
1.1
1.6
2.2
3.4
1.2
1.8
2.2
2.7
1.2
2.0
3.0
1.3
1.0
2.1
2.9
1.0
1.0
2.4
2.2
1.0
2.2
2.0
2.1
1.0
1.9
2.0
2.1
1.3
1.4
2.1
2.1
1.4
1.6
2.2
Prepared by Metoc plc 1 April 2009
Spectral peakedness parameter gamma
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
1.5
1.5
1.5
1.5
1.5
1.6
1.6
1.8
2.0
2.1
2.4
2.2
1.9
1.4
1.6
N
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.6
2.0
2.1
2.1
2.2
2.1
2.2
W
6.5
6.5
6.6
6.6
6.6
6.7
6.8
6.9
7.1
13.8
13.8
13.9
14.1
14.2
14.3
NW
10.4
10.6
10.6
10.7
10.7
10.7
10.7
10.7
10.7
10.8
10.8
10.9
10.9
10.9
10.9
1-year October
SW Wave Hub Shore Export Cable - Metocean Design Basis
Notes
Intended for use in engineering design of seabed cable
Extreme Hs and Tz are generated by wave refraction model MIKE21
The model calculates the transformation to shore of extreme waves input at its offshore boundary
For waves moving offshore (e.g. from east) it calculates wind-generated wave growth
Other wave parameters are derived from Hs and Tz using industry-standard relationships:
Tp = 1.27*Tz
Hmax is calculated from Hs and Tz for 3 hr storm duration according to Rayleigh theory; limited to 0.78 depth
Lower Tmax/Tz ratio 1.05; Upper Tmax/Tz ratio 1.40; Central Tmax is same as Tp
Gamma derived fron Hs, Tp using formulation given in offshore standard DNV-OS-J101
Wave boundary inputs calculated from European Wave Model at 50.7°N 5.7°W Nov 1988 - Nov 2008
European model data (joint frequency tables) purchased under licence from UK Met Office
Wind inputs calculated from Seven Stones Light Vessel observations 50°6'9"N 6°6'0"W Sep 2001 - Jan 2009
Table A10 Wave criteria - Return Period 1 year - October
I:\P1209_JPKenny\R2056 metocean\App A.xls oct 09/04/2009 09:44
p 3 of 3
Hs (m) at KP 24.5
Hs (m) at KP 15
N
N
NW
NE
10
15
NE
10
NW
5
5
W
N
15
15
NW
Hs (m) at KP 1.5
0
E
SW
SE
W
5
E
0
SW
W
SE
S
SW
SE
S
0.78 H/d breaking limit
Extreme significant wave height, Hs (m)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
4.4
4.6
4.7
4.8
4.8
4.9
5.0
5.2
5.4
5.6
5.9
9.4
9.7
8.7
9.3
N
3.6
3.6
3.6
3.6
3.6
3.6
3.6
3.6
3.7
4.1
4.2
4.2
4.3
4.3
4.4
1-year November
NE
1.0
1.0
1.0
1.0
1.1
1.1
1.1
1.2
1.3
2.1
2.7
3.3
3.3
3.3
3.3
E
0.3
0.3
0.3
0.4
0.4
0.4
0.4
0.5
0.6
1.0
1.2
1.8
2.1
2.3
2.4
SE
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.3
0.5
0.7
1.1
1.4
1.6
1.7
S
0.2
0.2
0.2
0.3
0.3
0.3
0.3
0.3
0.4
0.8
0.9
1.2
1.7
2.1
2.3
E
1.9
1.9
2.0
2.1
2.1
2.2
2.3
2.5
2.7
3.6
4.1
4.7
5.1
5.3
5.4
SE
1.3
1.4
1.4
1.4
1.4
1.5
1.5
1.6
1.7
2.3
2.7
3.5
4.0
4.3
4.5
S
SW
W
NW
1.6
2.2
4.8
7.6
1.7
2.3
4.8
7.8
1.7
2.3
4.8
7.9
1.7
2.3
4.9
7.9
1.7
2.4
4.9
8.0
1.8
2.4
4.9
8.0
1.8
2.5
5.0
8.0
1.9
2.6
5.1
8.0
2.1
2.8
5.2
8.0
2.9
3.9
10.3
8.1
3.0
4.6
10.3
8.1
3.7
10.0
10.3
8.2
4.5
10.0
10.7
8.2
4.9
10.1
10.9
8.2
5.2
10.1
11.0
8.2
Prepared by Metoc plc 1 April 2009
Mean zero-upcrossing wave period Tz (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
7.6
7.8
7.9
7.9
8.0
8.0
8.0
8.0
8.0
8.1
8.1
10.3
10.7
10.9
11.0
E
0
S
8 m Still water level above CD
NE
10
N
6.9
6.9
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.1
7.1
7.1
7.1
7.1
NE
4.2
4.1
4.1
4.1
4.1
4.1
4.1
4.0
4.0
6.1
6.1
6.2
6.2
6.2
6.2
SW
0.5
0.5
0.6
0.6
0.6
0.6
0.6
0.7
0.7
1.1
1.3
3.2
6.1
7.2
7.4
W
1.5
1.5
1.6
1.6
1.6
1.6
1.7
1.8
1.9
4.6
5.1
9.4
9.7
8.7
9.3
NW
4.4
4.6
4.7
4.8
4.8
4.9
5.0
5.2
5.4
5.6
5.9
5.5
5.5
5.8
5.8
1-year November
SW Wave Hub Shore Export Cable - Metocean Design Basis
Table A11 Wave criteria - Return Period 1 year - November
I:\P1209_JPKenny\R2056 metocean\App A.xls nov 09/04/2009 09:44
p 1 of 3
8 m Still water level above CD
0.78 H/d breaking limit
Period of peak spectral energy Tp (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
9.7
9.9
10.0
10.1
10.1
10.1
10.1
10.2
10.2
10.3
10.3
13.1
13.6
13.9
14.0
N
8.8
8.8
8.8
8.8
8.9
8.9
8.9
8.9
8.9
8.9
9.0
9.0
9.0
9.0
9.0
1-year November
NE
5.3
5.3
5.2
5.2
5.2
5.2
5.2
5.1
5.1
7.8
7.8
7.8
7.8
7.8
7.8
E
2.4
2.5
2.6
2.6
2.7
2.8
2.9
3.1
3.4
4.6
5.1
6.0
6.4
6.8
6.8
SE
1.7
1.7
1.7
1.8
1.8
1.8
1.9
2.0
2.2
3.0
3.4
4.4
5.0
5.4
5.7
S
2.1
2.1
2.1
2.2
2.2
2.3
2.3
2.5
2.7
3.6
3.9
4.7
5.7
6.2
6.6
SW
2.8
2.9
2.9
3.0
3.0
3.1
3.1
3.2
3.6
5.0
5.8
12.7
12.7
12.8
12.8
SE
0.3
0.3
0.3
0.4
0.4
0.4
0.4
0.5
0.5
1.1
1.4
2.2
2.7
3.1
3.4
S
0.5
0.5
0.5
0.5
0.6
0.6
0.6
0.7
0.8
1.6
1.8
2.3
3.4
4.0
4.5
SW
1.1
1.1
1.2
1.2
1.2
1.3
1.3
1.4
1.5
2.3
2.7
6.0
11.4
13.4
13.9
Maximum wave height in a 3-hour sea state Hmax (m)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
7.0
7.8
8.6
9.0
9.1
9.2
9.4
9.8
10.2
10.7
11.2
17.4
18.0
16.1
17.2
N
6.8
6.9
6.9
6.9
6.9
6.9
6.9
7.0
7.0
7.8
8.1
8.1
8.3
8.3
8.4
NE
2.0
2.0
2.0
2.1
2.1
2.2
2.2
2.4
2.5
4.1
5.3
6.3
6.3
6.4
6.4
E
0.6
0.7
0.7
0.7
0.8
0.9
0.9
1.0
1.2
2.0
2.5
3.6
4.1
4.4
4.6
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
8.0
8.2
8.3
8.3
8.4
8.4
8.4
8.4
8.4
8.5
8.5
10.8
11.3
11.5
11.6
N
7.2
7.3
7.3
7.3
7.3
7.3
7.3
7.3
7.3
7.4
7.4
7.5
7.5
7.5
7.5
NE
4.4
4.3
4.3
4.3
4.3
4.3
4.3
4.2
4.2
6.4
6.4
6.5
6.5
6.5
6.5
E
2.0
2.0
2.1
2.2
2.2
2.3
2.4
2.6
2.8
3.8
4.3
4.9
5.3
5.6
5.6
NW
9.7
9.9
10.0
10.1
10.1
10.1
10.1
10.2
10.2
10.3
10.3
10.4
10.4
10.4
10.4
1-year November
Period associated with max wave height - lower limit of Tmax (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
W
6.1
6.1
6.2
6.2
6.2
6.2
6.4
6.5
6.6
13.1
13.1
13.1
13.6
13.9
14.0
SE
1.4
1.4
1.4
1.5
1.5
1.5
1.6
1.7
1.8
2.5
2.8
3.7
4.2
4.5
4.7
W
3.0
3.0
3.1
3.1
3.1
3.2
3.3
3.4
3.7
8.5
9.6
17.4
18.0
16.1
17.2
NW
7.0
7.8
8.6
9.0
9.1
9.2
9.4
9.8
10.2
10.7
11.2
10.4
10.5
10.9
11.0
1-year November
S
SW
W
NW
1.7
2.3
5.0
8.0
1.7
2.4
5.1
8.2
1.8
2.4
5.1
8.3
1.8
2.5
5.1
8.3
1.8
2.5
5.1
8.4
1.9
2.5
5.2
8.4
1.9
2.6
5.3
8.4
2.0
2.7
5.3
8.4
2.2
2.9
5.5
8.4
3.0
4.1
10.8
8.5
3.2
4.8
10.8
8.5
3.9
10.5
10.8
8.6
4.7
10.5
11.3
8.6
5.2
10.6
11.5
8.6
5.4
10.6
11.6
8.6
Prepared by Metoc plc 1 April 2009
SW Wave Hub Shore Export Cable - Metocean Design Basis
Table A11 Wave criteria - Return Period 1 year - November
I:\P1209_JPKenny\R2056 metocean\App A.xls nov 09/04/2009 09:44
p 2 of 3
8 m Still water level above CD
0.78 H/d breaking limit
Period associated with max wave height - upper limit of Tmax (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
10.6
10.9
11.0
11.1
11.1
11.2
11.2
11.2
11.2
11.3
11.3
14.4
15.0
15.3
15.4
N
9.6
9.7
9.7
9.8
9.8
9.8
9.8
9.8
9.8
9.8
9.9
9.9
10.0
10.0
10.0
1-year November
NE
5.8
5.8
5.8
5.8
5.7
5.7
5.7
5.7
5.6
8.6
8.6
8.6
8.6
8.6
8.6
E
2.6
2.7
2.8
2.9
3.0
3.1
3.2
3.4
3.7
5.1
5.7
6.6
7.1
7.4
7.5
SE
1.9
1.9
1.9
2.0
2.0
2.0
2.1
2.2
2.4
3.3
3.8
4.9
5.5
6.0
6.3
S
2.3
2.3
2.4
2.4
2.4
2.5
2.6
2.7
3.0
4.0
4.3
5.2
6.3
6.9
7.2
SW
3.1
3.2
3.2
3.3
3.3
3.4
3.4
3.6
3.9
5.5
6.4
14.0
14.0
14.1
14.1
NE
1.0
1.0
1.0
1.0
1.0
1.1
1.1
1.4
1.8
1.0
1.4
2.2
2.2
2.2
2.2
E
2.2
2.1
2.0
2.0
2.1
2.1
2.1
1.9
1.8
1.5
1.6
1.9
1.9
1.8
2.0
SE
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
3.0
2.9
2.4
2.3
2.2
2.2
S
SW
W
NW
2.2
3.6
1.1
1.6
2.2
3.6
1.1
1.5
2.2
3.6
1.1
1.5
2.2
3.5
1.1
1.6
2.2
3.5
1.1
1.6
2.2
3.5
1.1
1.6
2.2
3.5
1.1
1.7
2.2
3.4
1.2
1.8
2.2
2.7
1.2
2.0
3.0
1.4
1.0
2.2
2.9
1.0
1.0
2.4
2.0
1.0
2.3
1.9
2.1
1.0
2.0
1.9
2.1
1.3
1.4
2.1
2.1
1.4
1.6
2.2
Prepared by Metoc plc 1 April 2009
Spectral peakedness parameter gamma
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
1.6
1.5
1.5
1.6
1.6
1.6
1.7
1.8
2.0
2.2
2.4
2.3
2.0
1.4
1.6
N
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.9
2.1
2.0
2.1
2.1
2.2
W
6.7
6.8
6.8
6.8
6.8
6.9
7.0
7.1
7.3
14.4
14.5
14.4
15.0
15.3
15.4
NW
10.6
10.9
11.0
11.1
11.1
11.2
11.2
11.2
11.2
11.3
11.3
11.4
11.5
11.5
11.5
1-year November
SW Wave Hub Shore Export Cable - Metocean Design Basis
Notes
Intended for use in engineering design of seabed cable
Extreme Hs and Tz are generated by wave refraction model MIKE21
The model calculates the transformation to shore of extreme waves input at its offshore boundary
For waves moving offshore (e.g. from east) it calculates wind-generated wave growth
Other wave parameters are derived from Hs and Tz using industry-standard relationships:
Tp = 1.27*Tz
Hmax is calculated from Hs and Tz for 3 hr storm duration according to Rayleigh theory; limited to 0.78 depth
Lower Tmax/Tz ratio 1.05; Upper Tmax/Tz ratio 1.40; Central Tmax is same as Tp
Gamma derived fron Hs, Tp using formulation given in offshore standard DNV-OS-J101
Wave boundary inputs calculated from European Wave Model at 50.7°N 5.7°W Nov 1988 - Nov 2008
European model data (joint frequency tables) purchased under licence from UK Met Office
Wind inputs calculated from Seven Stones Light Vessel observations 50°6'9"N 6°6'0"W Sep 2001 - Jan 2009
Table A11 Wave criteria - Return Period 1 year - November
I:\P1209_JPKenny\R2056 metocean\App A.xls nov 09/04/2009 09:44
p 3 of 3
Hs (m) at KP 24.5
Hs (m) at KP 15
N
N
NW
NE
10
15
NE
10
NW
5
5
W
N
15
15
NW
Hs (m) at KP 1.5
0
E
SW
SE
W
5
E
0
SW
W
SE
S
SW
SE
S
0.78 H/d breaking limit
Extreme significant wave height, Hs (m)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
4.5
4.7
4.8
4.8
4.9
4.9
5.1
5.2
5.5
5.8
6.0
9.6
10.2
9.3
9.9
N
3.6
3.6
3.6
3.6
3.6
3.6
3.7
3.7
3.7
4.1
4.3
4.3
4.4
4.4
4.4
1-year December
NE
1.1
1.1
1.2
1.2
1.2
1.2
1.2
1.3
1.4
2.3
2.9
3.6
3.6
3.6
3.6
E
0.3
0.3
0.3
0.4
0.4
0.4
0.4
0.5
0.6
1.0
1.3
1.9
2.1
2.3
2.4
SE
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.3
0.6
0.7
1.1
1.4
1.6
1.7
S
0.2
0.2
0.2
0.3
0.3
0.3
0.3
0.3
0.4
0.8
0.9
1.2
1.8
2.1
2.3
E
1.6
1.7
1.9
2.0
2.1
2.2
2.3
2.5
2.7
3.7
4.1
4.7
5.0
5.3
5.4
SE
1.3
1.4
1.4
1.4
1.4
1.5
1.5
1.6
1.7
2.5
2.8
3.5
3.9
4.2
4.5
S
SW
W
NW
1.6
2.3
4.8
7.6
1.7
2.3
4.8
7.8
1.7
2.3
4.9
7.9
1.7
2.4
4.9
8.0
1.8
2.4
4.9
8.0
1.8
2.4
4.9
8.0
1.8
2.5
5.0
8.1
2.0
2.6
5.1
8.1
2.1
2.8
5.2
8.1
2.9
3.9
10.5
8.1
3.1
4.6
10.5
8.2
3.7
10.1
10.4
8.2
4.5
10.1
11.0
8.3
5.0
10.2
11.3
8.3
5.2
10.2
11.4
8.3
Prepared by Metoc plc 1 April 2009
Mean zero-upcrossing wave period Tz (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
7.6
7.8
7.9
8.0
8.0
8.0
8.1
8.1
8.1
8.1
8.2
10.4
11.0
11.3
11.4
E
0
S
8 m Still water level above CD
NE
10
N
6.9
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.1
7.1
7.1
7.1
7.2
7.2
NE
4.3
4.3
4.3
4.3
4.3
4.3
4.3
4.2
4.2
6.4
6.4
6.4
6.5
6.5
6.5
SW
0.5
0.6
0.6
0.6
0.6
0.6
0.7
0.7
0.8
1.1
1.3
3.3
6.2
7.4
7.6
W
1.5
1.6
1.6
1.6
1.6
1.6
1.7
1.8
1.9
4.8
5.3
9.6
10.2
9.3
9.9
NW
4.5
4.7
4.8
4.8
4.9
4.9
5.1
5.2
5.5
5.8
6.0
5.6
5.6
5.9
5.9
1-year December
SW Wave Hub Shore Export Cable - Metocean Design Basis
Table A12 Wave criteria - Return Period 1 year - December
I:\P1209_JPKenny\R2056 metocean\App A.xls dec 09/04/2009 09:44
p 1 of 3
8 m Still water level above CD
0.78 H/d breaking limit
Period of peak spectral energy Tp (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
9.7
9.9
10.1
10.1
10.2
10.2
10.2
10.2
10.3
10.3
10.4
13.3
14.0
14.3
14.5
N
8.8
8.8
8.9
8.9
8.9
8.9
8.9
8.9
8.9
9.0
9.0
9.1
9.1
9.1
9.1
1-year December
NE
5.5
5.5
5.5
5.5
5.4
5.4
5.4
5.4
5.3
8.1
8.1
8.2
8.2
8.2
8.2
E
2.0
2.2
2.4
2.5
2.6
2.8
2.9
3.1
3.4
4.7
5.2
6.0
6.4
6.8
6.8
SE
1.7
1.7
1.8
1.8
1.8
1.9
1.9
2.0
2.2
3.2
3.5
4.4
5.0
5.4
5.7
S
2.1
2.1
2.2
2.2
2.2
2.3
2.3
2.5
2.7
3.6
3.9
4.7
5.8
6.3
6.6
SW
2.9
2.9
3.0
3.0
3.0
3.1
3.2
3.3
3.6
5.0
5.8
12.8
12.8
12.9
12.9
SE
0.3
0.3
0.4
0.4
0.4
0.4
0.4
0.5
0.6
1.3
1.5
2.2
2.7
3.1
3.4
S
0.5
0.5
0.5
0.5
0.6
0.6
0.6
0.7
0.8
1.6
1.8
2.4
3.5
4.1
4.6
SW
1.1
1.1
1.2
1.2
1.2
1.3
1.3
1.4
1.5
2.2
2.6
6.1
11.7
13.7
14.1
Maximum wave height in a 3-hour sea state Hmax (m)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
7.0
7.8
8.6
9.2
9.3
9.4
9.6
9.9
10.4
10.9
11.5
17.9
19.0
17.2
18.4
N
6.9
6.9
7.0
7.0
7.0
7.0
7.0
7.0
7.1
7.8
8.2
8.2
8.4
8.3
8.5
NE
2.2
2.3
2.3
2.3
2.4
2.4
2.5
2.6
2.8
4.4
5.7
6.9
6.9
6.9
7.0
E
0.6
0.6
0.7
0.7
0.8
0.9
0.9
1.0
1.2
2.0
2.5
3.7
4.2
4.5
4.8
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
8.0
8.2
8.3
8.4
8.4
8.4
8.5
8.5
8.5
8.6
8.6
11.0
11.6
11.8
12.0
N
7.3
7.3
7.3
7.3
7.3
7.4
7.4
7.4
7.4
7.4
7.4
7.5
7.5
7.5
7.5
NE
4.6
4.6
4.5
4.5
4.5
4.5
4.5
4.4
4.4
6.7
6.7
6.8
6.8
6.8
6.8
E
1.7
1.8
2.0
2.1
2.2
2.3
2.4
2.6
2.8
3.9
4.3
5.0
5.3
5.6
5.7
NW
9.7
9.9
10.1
10.1
10.2
10.2
10.2
10.2
10.3
10.3
10.4
10.5
10.5
10.5
10.5
1-year December
Period associated with max wave height - lower limit of Tmax (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
W
6.1
6.2
6.2
6.2
6.2
6.3
6.4
6.5
6.6
13.3
13.3
13.3
14.0
14.3
14.5
SE
1.4
1.4
1.5
1.5
1.5
1.5
1.6
1.7
1.8
2.7
2.9
3.7
4.1
4.4
4.7
W
3.0
3.1
3.1
3.1
3.2
3.2
3.4
3.5
3.7
8.9
10.0
17.9
19.0
17.2
18.4
NW
7.0
7.8
8.6
9.2
9.3
9.4
9.6
9.9
10.4
10.9
11.5
10.6
10.7
11.1
11.2
1-year December
S
SW
W
NW
1.7
2.4
5.1
8.0
1.7
2.4
5.1
8.2
1.8
2.4
5.1
8.3
1.8
2.5
5.1
8.4
1.8
2.5
5.2
8.4
1.9
2.5
5.2
8.4
1.9
2.6
5.3
8.5
2.1
2.7
5.4
8.5
2.2
3.0
5.5
8.5
3.0
4.1
11.0
8.6
3.2
4.8
11.0
8.6
3.9
10.6
11.0
8.6
4.8
10.6
11.6
8.7
5.2
10.7
11.8
8.7
5.5
10.7
12.0
8.7
Prepared by Metoc plc 1 April 2009
SW Wave Hub Shore Export Cable - Metocean Design Basis
Table A12 Wave criteria - Return Period 1 year - December
I:\P1209_JPKenny\R2056 metocean\App A.xls dec 09/04/2009 09:44
p 2 of 3
8 m Still water level above CD
0.78 H/d breaking limit
Period associated with max wave height - upper limit of Tmax (s)
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
10.7
11.0
11.1
11.2
11.2
11.2
11.3
11.3
11.3
11.4
11.4
14.6
15.4
15.8
15.9
N
9.7
9.8
9.8
9.8
9.8
9.8
9.8
9.8
9.8
9.9
9.9
10.0
10.0
10.0
10.0
1-year December
NE
6.1
6.1
6.0
6.0
6.0
6.0
6.0
5.9
5.9
9.0
9.0
9.0
9.0
9.0
9.0
E
2.2
2.4
2.6
2.8
2.9
3.1
3.2
3.5
3.8
5.1
5.7
6.6
7.1
7.5
7.5
SE
1.9
1.9
1.9
2.0
2.0
2.0
2.1
2.2
2.4
3.5
3.9
4.9
5.5
5.9
6.2
S
2.3
2.3
2.4
2.4
2.5
2.5
2.6
2.7
3.0
4.0
4.3
5.2
6.4
6.9
7.3
SW
3.2
3.2
3.3
3.3
3.4
3.4
3.5
3.6
4.0
5.5
6.4
14.1
14.1
14.2
14.2
NE
1.0
1.0
1.0
1.0
1.1
1.1
1.2
1.5
1.8
1.0
1.3
2.1
2.1
2.2
2.2
E
3.6
3.0
2.6
2.4
2.3
2.2
2.1
2.0
1.8
1.5
1.6
1.9
2.0
1.9
2.0
SE
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.9
2.8
2.3
2.3
2.2
2.2
S
SW
W
NW
2.2
3.6
1.1
1.6
2.2
3.6
1.1
1.6
2.2
3.6
1.1
1.6
2.2
3.5
1.1
1.6
2.2
3.5
1.1
1.6
2.2
3.5
1.1
1.6
2.2
3.5
1.1
1.7
2.2
3.4
1.2
1.8
2.2
2.7
1.2
2.0
2.9
1.4
1.0
2.2
2.8
1.0
1.0
2.5
2.2
1.0
2.3
1.9
2.1
1.0
2.0
1.9
2.2
1.3
1.4
2.1
2.2
1.4
1.6
2.2
Prepared by Metoc plc 1 April 2009
Spectral peakedness parameter gamma
KP, km
1.25
1.30
1.35
1.40
1.45
1.50
1.60
1.80
2.15
3.45
4.15
10.0
15.0
20.0
24.5
Depth, m CD
1
2
3
4
5
6
8
10
12
15
20
22
28
33
52
Omni
1.6
1.6
1.6
1.6
1.6
1.6
1.7
1.8
2.0
2.2
2.5
2.3
2.0
1.4
1.6
N
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.9
2.1
2.0
2.1
2.1
2.2
W
6.7
6.8
6.8
6.9
6.9
6.9
7.0
7.1
7.3
14.7
14.7
14.6
15.4
15.8
15.9
NW
10.7
11.0
11.1
11.2
11.2
11.2
11.3
11.3
11.3
11.4
11.4
11.5
11.6
11.6
11.6
1-year December
SW Wave Hub Shore Export Cable - Metocean Design Basis
Notes
Intended for use in engineering design of seabed cable
Extreme Hs and Tz are generated by wave refraction model MIKE21
The model calculates the transformation to shore of extreme waves input at its offshore boundary
For waves moving offshore (e.g. from east) it calculates wind-generated wave growth
Other wave parameters are derived from Hs and Tz using industry-standard relationships:
Tp = 1.27*Tz
Hmax is calculated from Hs and Tz for 3 hr storm duration according to Rayleigh theory; limited to 0.78 depth
Lower Tmax/Tz ratio 1.05; Upper Tmax/Tz ratio 1.40; Central Tmax is same as Tp
Gamma derived fron Hs, Tp using formulation given in offshore standard DNV-OS-J101
Wave boundary inputs calculated from European Wave Model at 50.7°N 5.7°W Nov 1988 - Nov 2008
European model data (joint frequency tables) purchased under licence from UK Met Office
Wind inputs calculated from Seven Stones Light Vessel observations 50°6'9"N 6°6'0"W Sep 2001 - Jan 2009
Table A12 Wave criteria - Return Period 1 year - December
I:\P1209_JPKenny\R2056 metocean\App A.xls dec 09/04/2009 09:44
p 3 of 3
JP KENNY
SW WAVE HUB - METOCEAN DESIGN BASIS
Appendix B Wave Model Plots
REPORT NO: 2056, REV 0
FILENAME: P1209A / TMAR50.DOC
B-1
29/04/2009
JP KENNY
SW WAVE HUB - METOCEAN DESIGN BASIS
Explanatory Note
This Appendix contains images of the spatial distribution of 100-year extreme
wave height throughout the model domain for each of the 8 directions
simulated.
In each case the model domain is configured to suit the direction sector. Wave
height magnitudes are indicated by colour coding while black arrows depict the
direction of wave travel at intervals throughout the domain. The proposed cable
route is also shown for reference.
Images are as follows:
B1
100-yr from N
B2
100-yr from NE
B3
100-yr from E
B4
100-yr from SE
B5
100-yr from S
B6
100-yr from SW
B7
100-yr from W
B8
100-yr from NW
REPORT NO: 2056, REV 0
FILENAME: P1209A / TMAR50.DOC
B-2
29/04/2009