NIO/SP-01/2015
(SSP 2913)
DISTRIBUTION RESTRICTED
DEMARCATION OF HIGH TIDE LINE, LOW TIDE LINE AND
DELINEATION OF CRZ BOUNDARIES FOR PROPOSED
REROUTING OF 42” SBHT LINE OF ONGC AT UMBHARAT BEACH,
GUJARAT
Sponsored by
Oil and Natural Gas Corporation Limited,
Hazira, Gujarat
JANUARY 2015
सीएसआईआर – रा ीय समुि व ान संःथान
CSIR-NATIONAL INSTITUTE OF OCEANOGRAPHY
(वै ािनक तथा औ ोिगक अनुसंधान प रषद)
(COUNCIL OF SCIENTIFIC & INDUSTRIAL RESEARCH)
दोना पावला, गोवा भारत / DONA PAULA, GOA - 403004 India
फ़ोन/Tel : 91(0)832-2450450/ 2450327
फै स /Fax: 91(0)832-2450602
इ-मेल/e-mail : [email protected]
http:// www.nio.org
NIO/SP-01/2015
(SSP 2913)
Demarcation of high tide line, low tide line and delineation
of CRZ boundaries for proposed rerouting of 42” SBHT line
of ONGC at Umbharat beach, Gujarat
Sponsored by
Oil and Natural Gas Corporation Limited,
Hazira,
Gujarat
Project Leader:
Mr. S. Vaz
Deputy Project Leader: Mr. K.C. Pathak
रा ीय समुि व ान संःथान
CSIR-NATIONAL INSTITUTE OF OCEANOGRAPHY
(वै ािनक तथा औ ोिगक अनुसंधान प रषद)
(COUNCIL OF SCIENTIFIC & INDUSTRIAL RESEARCH)
दोना पावला, गोवा, भारत / DONA PAULA, GOA – 403004, India
फ़ोन/Tel : 91(0)832-2450450 : फै स /Fax: 91(0)832-2450602
इ-मेल/e-mail : [email protected]
http:// www.nio.org
January 2015
Demarcation of high tide line, low tide line and delineation of CRZ boundaries for proposed rerouting of 42”
SBHT line of ONGC at Umbharat beach, Gujarat. NIO/SP-01/2015
CONTENTS
Page No.
(i) LIST OF CONTRIBUTORS
2
(ii) LIST OF PLATES
3
(iii) LIST OF FIGURES
3
(iv) EXECUTIVE SUMMARY
4
1.0
INTRODUCTION
8
1.1
Background of the project
8
1.2
Project description
9
1.3
Scope of work
10
1.4
Tides
10
METHODOLOGY AND EQUIPMENT
11
2.1
Methodology
11
2.2
Equipment
12
2.0
2.2.1 Ceeducer ProTM
12
2.2.2 LasertrakTM
13
DATA ACQUISITION, RESULTS AND INTERPRETATION
15
3.1
Data acquisition
15
3.2
Presentation of maps
16
3.3
Observations and results
16
3.0
3.3.1 Geomorphology
16
3.3.2 Coastal regulation zones
17
4.0
SUMMARY AND CONCLUSIONS
22
5.0
ACKNOWLEDGEMENTS
25
6.0
SELECTED BIBLIOGRAPHY
26
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Demarcation of high tide line, low tide line and delineation of CRZ boundaries for proposed rerouting of 42”
SBHT line of ONGC at Umbharat beach, Gujarat. NIO/SP-01/2015
LIST OF CONTRIBUTORS
Data Acquisition
Mr. K.C. Pathak
Mr. Suresh Pattanshetti
Dr. Prakash Babu
Mr. Santana Vaz
Data Processing and Interpretation
Mr. Gurudas Tirodkar
Dr. Prakash Babu
Mr. Santana Vaz
Mr. Suresh Pattanshetti
Mr. K.C. Pathak
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Demarcation of high tide line, low tide line and delineation of CRZ boundaries for proposed rerouting of 42”
SBHT line of ONGC at Umbharat beach, Gujarat. NIO/SP-01/2015
LIST OF PLATES
Plate 1a & 1b: Photographs showing HTL, sand dunes and vegetation at Umbharat
beach, Gujarat.
Plate 2a & 2b: Photographs showing general physiography along the Umbharat
beach, Gujarat.
Plate 3a & 3b: Photographs showing exposed existing pipeline and its protection
measures at Umbharat beach, Gujarat.
Plate 4a & 4b: Photographs showing corridor of proposed 42” SBHT pipeline and
systematic plantation of Eucalyptus trees at Umbharat, Village.
Plate 5a & 5b: Photographs showing general physiography along the corridor of
proposed 42” SBHT pipeline at Umbharat, Village.
Plate 6a & 6b: Photographs showing tourism activity at Umbharat beach.
LIST OF FIGURES
Fig. 1
Google image showing general physiography around the proposed site of
rerouting of 42” SBHT line of ONGC located at Umbharat beach, Village
Umbharat, Gujarat.
Fig. 2
Map in the scale of 1:4000 showing high tide line, low tide line and CRZ
boundaries for proposed rerouting of 42” SBHT line of ONGC located at
Umbharat beach, Village Umbharat, Gujarat.
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Demarcation of high tide line, low tide line and delineation of CRZ boundaries for proposed rerouting of 42”
SBHT line of ONGC at Umbharat beach, Gujarat. NIO/SP-01/2015
EXECUTIVE SUMMARY
Coastal land and water are the most vital resources around which overall
development of the country rests. The strong interaction among them and inter
dependence with other component of the sociological system underscores the need
for putting these resources at the center of any development effort. At present the
national objective for coastal, estuaries and creek area is to manage them to ensure
sustainable development of these resources for multiple uses. Broad national
objective have to be translated into implementable activities for particular area to
achieve the desired results. In
this
instance,
High Tide Line
(HTL)
along
proposed site and the proposed rerouting of 42” SBHT line of ONGC at Umbharat
beach, Navasari district of Gujarat was to be demarcated. On the request of the
ONGC, the project was taken up by the CSIR-National Institute of Oceanography
(NIO), Goa; which is one of the authorized agency of Ministry of Environment and
Forests (MoEF); to demarcate the high tide line, low tide line and delineate the
Coastal Regulation Zone (CRZ) boundaries.
This report details the process of physical demarcation of high tide line, low tide line
and delineation of CRZ boundaries for proposed rerouting of 42” SBHT line of ONGC
at Umbharat beach, Gujarat. The report identifies the horizontal position of high tide
line associated with the shoreline morphological features.
On demarcation of high tide line and low tide line, the designated boundary of
Coastal Regulation Zone was delineated and marked on the map. The demarcation
is carried out as per the guidelines prescribed by the MoEF. Approved Coastal Zone
Management Plan of Gujarat was also referred and considered while drawing the
conclusions.
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Demarcation of high tide line, low tide line and delineation of CRZ boundaries for proposed rerouting of 42”
SBHT line of ONGC at Umbharat beach, Gujarat. NIO/SP-01/2015
The conclusions drawn are as follows:
•
The proposed rerouting of 42” SBHT line of ONGC is located at Umbharat
beach, Village Umbharat, Navasari district, Gujarat.
•
The corridor co-ordinates of proposed route of 42” SBHT line is provided and
identified by ONGC and the same is verified and depicted in the map. Also the
existing pipe line is also identified by ONGC and same is surveyed and
marked in the map (Fig. 2).
•
Sand dunes are observed along the relevant coast of the proposed rerouting
of 42” SBHT line of ONGC at Umbharat beach and same are considered as
the identification marker for HTL and used for the demarcation (Plates 1a, 1b
& 2a & 2b).
•
The area between HTL and 500 m setback line is mostly covered with sand
dunes, and vegetation like thorny shrubs and Eucalyptus trees (Plates 2a &
2b , 4a & 4b).
•
The sand dunes noticed near the coast and beyond the high water line are
mostly covered with natural vegetation such as small to medium high thorny
shrubs ranging in height between 2 and 3 m. The growth of these shrubs is
nearly continuous along the sand dunes. This natural vegetation shows that
these sand dunes are stabilized (Plates 1a & 1b, 2a & 2b).
•
Along with natural vegetation the sand dunes also consists of 5 to 8 m high
Eucalyptus trees at certain places. These Eucalyptus trees are observed to be
planted systematically after clearing the top portion of the sand dunes (Plate
4b).
•
The major portion of the corridor of proposed rerouting of 42” SBHT line of
ONGC at Umbharat beach passes through the sand dunes. (Fig. 2, Plate 5a
& 5b).
•
Along the corridor of proposed rerouting of 42” SBHT line of ONGC a portion
of sand dunes covering approximately with 20 cm thick soil was noticed.
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Demarcation of high tide line, low tide line and delineation of CRZ boundaries for proposed rerouting of 42”
SBHT line of ONGC at Umbharat beach, Gujarat. NIO/SP-01/2015
Green vegetation is seen on this soil cover (Plate 5b). Presence of soil over
sand dunes clearly establishes that the sand dunes are stabilized.
•
CRZ map indicating HTL, LTL, CRZ boundaries and existing pipeline and the
corridor for the proposed rerouting of 42” SBHT line of ONGC is prepared in
the scale of 1:4000 and are annexed to this report (Fig. 2).
•
The setback line of 200 and 500 meters in open sea delineated along
landward side of the HTL configuration.
•
The CRZ classification of the survey area for the proposed rerouting of 42”
SBHT line of ONGC at Umbharat beach are as follows:
¾ The area upto 200 m from HTL in open sea is demarcated as No
Development Zone (NDZ).
¾ The land area between HTL and 500 m setback line in open sea has
been classified as CRZ-I(A) (Fig. 2).
¾ The area between LTL and HTL is termed as the intertidal zone and
same is classified as CRZ-I(B).
¾ The water covered area from LTL to twelve nautical miles on the
seaward side is classified as CRZ-IV.
•
The CRZ map indicates that (i) Major portion of the proposed rerouting of 42”
SBHT line of ONGC at Umbharat beach falls in the CRZ-I(A) and CRZ-I(B)
(Fig. 2).
•
As per the provisions of CRZ Notification 2011, manufacture or handling oil
storage or disposal of hazardous substance are declared as prohibited
activities within the CRZ, except transfer of hazardous substances from
ship to ports, terminals and refineries and vice versa and facilities for
receipt and storage of petroleum product and liquefied natural gas [Para
3(ii)(a) & (b)].
•
As per Para 4(ii)d of CRZ Notification 2011, laying of pipelines, conveying
systems, transmission lines; are permissible activities in CRZ area.
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Demarcation of high tide line, low tide line and delineation of CRZ boundaries for proposed rerouting of 42”
SBHT line of ONGC at Umbharat beach, Gujarat. NIO/SP-01/2015
•
AS per the CRZ Notification 2011, Para 8 (i) (I)(i)(b), no new construction shall
be permitted in CRZ-I except pipelines, conveying systems including
transmission lines.
•
The Tourism activity is observed at the Umbharat beach (Plate 6a & 6b).
•
The HTL and LTL may change if any of the existing morphological
features are altered.
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Demarcation of high tide line, low tide line and delineation of CRZ boundaries for proposed rerouting of 42”
SBHT line of ONGC at Umbharat beach, Gujarat. NIO/SP-01/2015
1.0 INTRODUCTION
1.1 Background of the Project
The Oil and Natural Gas Corporation Limited (ONGC), Hazira plant receives sour
gas & condensate from Mumbai offshore through 36” and 42” SBHT (South Bassein
Hazira Trunkline) pipelines for processing and thereafter supplies sweet gas to HBJ
line through GAIL spanning about 3000 kms all northern states for downstream
industries. The 42” dia SBHT line got exposed at Umbharat beach. ONGC then
carried out protection measures with geotexile tube, Geobags and Gabion bags.
Meanwhile due to cyclonic storm and high tides 42” SBHT line got exposed, it
protection measures got damaged and shifted towards the sea. ONGC now
proposes rerouting of 42” SBHT line of ONGC at Umbharat beach. In order to set up
the alternate line Coastal Regulation Zone (CRZ) surveys to be carried out around
the project site for obtaining necessary clearance from the Ministry of Environment
and Forests (MoEF), New Delhi.
ONGC has awarded the CRZ study for proposed rerouting of 42” SBHT line of
ONGC at Umbharat beach to the CSIR-National Institute of Oceanography (NIO),
Goa. NIO; a constituent laboratory of the Council of Scientific & Industrial Research
(CSIR) under Ministry of Science and Technology, Government of India; is a
premiere oceanographic research institute. This Institute has the necessary
expertise supported by equipment and infrastructural facilities to carry out the above
studies.
Keeping in view the requirement of Coastal Regulation Zone legislation, CSIR-NIO,
Goa - one of the authorized agencies of the MoEF - has carried out the CRZ survey
for necessary demarcation and classification of the coastal regulation zone. The
details of these investigations and the CRZ maps are presented in this report entitled
“Demarcation of high tide line, low tide line and delineation of CRZ boundaries for
proposed rerouting of 42” SBHT line of ONGC at Umbharat beach, Gujarat".
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Demarcation of high tide line, low tide line and delineation of CRZ boundaries for proposed rerouting of 42”
SBHT line of ONGC at Umbharat beach, Gujarat. NIO/SP-01/2015
Coastal zone is broad geographic areas where terrestrial and marine factors
combine to provide unique land forms and ecological system. Coastal zone play an
important role in the economy of our country. The coastal zone is unique geological,
physical and biological area of vital economic and environmental value. Inadequately
planned coastal and marine development, poorly regulated economic activities and
increasing population growth have led to rapid destruction of coastal and marine
ecosystem. The recent enactment of CRZ act is indicative of both national and state
policies concern for the effect of regulating the development in environmentally
sensitive coastal zones. The CRZ act was mainly intended for regulating the various
uses of terrestrial and aquatic resources in the coastal areas covering to a distance
of 500 m from high tide line in the open coast and 100 meters or width of creek, river,
estuary or backwater whichever is less. To bring under the regulation of coastal
regulation zone act, these areas are expected to remain qualitatively unchanged in
their flora and fauna. The objective of the present study is to examine the
acceptability of this coastal development in relation with construction activities which
will be carried out through morphological zone, land forms and coastal environment.
1.2 Project Description
ONGC proposes rerouting of 42” SBHT line of ONGC at Umbharat beach, Gujarat.
The rerouting scheme include installation and laying of approximately 2.0 km long
42” dia rerouted pipeline between hook up point (HK-01) before LF-02 near land fall
to downstream of existing SV-01 (HK-02), fabrication and installation of new SV
station, installation of insulation joint near HK-01, isolation of existing section of the
pipeline using smart plugs, hook up of the rerouted line at HK-01 & HK-02 and
decommissioning of the exposed pipeline section.
The new rerouted line from hook up point HK-01 to HDD entry point (approx. 400
mts) will be laid to a depth of about 6 mor scour depth +2.5 m whichever is higher by
open cut trenching method. Thereafter about 1.1 km rerouted line from HDD entry
point to HDD exit point will be laid by horizontal directional drilling technique (HDD)
From HDD exit point to hook up point HK-02 (approx. 400 m), the rerouted line will
be laid by open cut trenching method.
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Demarcation of high tide line, low tide line and delineation of CRZ boundaries for proposed rerouting of 42”
SBHT line of ONGC at Umbharat beach, Gujarat. NIO/SP-01/2015
1.3 Scope of Work
i.
To demarcate the relevant High Tide Line (HTL) and Low Tide Line (LTL) around
the project site i.e. the proposed rerouting of 42” SBHT line of ONGC at
Umbharat beach, Gujarat.
ii.
To delineate the setback lines of 200 and 500 m from the relevant high tide line.
iii.
Classification of the CRZ.
iv.
Preparation of CRZ map and report.
1.4 Tides
Tides are the rise and fall of sea levels caused by the combined effects of the
gravitational forces exerted by the moon and the sun, and the rotation of the Earth.
In CRZ survey area, tides are semi-diurnal in nature. As the area is close to Hazira,
the tide values at Hazira with respect to Chart Datum are referred from tide table for
Magdalla Port, Hazira inner and Hazira outer of the year 2014.
.
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Demarcation of high tide line, low tide line and delineation of CRZ boundaries for proposed rerouting of 42”
SBHT line of ONGC at Umbharat beach, Gujarat. NIO/SP-01/2015
2.0 METHODOLOGY AND EQUIPMENT
2.1 Methodology
For the purpose of meeting the requirement of the CRZ notification, “the high tide
line means the line on the land up to which the highest water line reaches
during the spring tide." Here the word "highest water line reaches during the spring
tide" refers to the mean high water spring (19 years average of spring water) that is
the regular water level fluctuations caused by changes in relative position of the Sun,
Moon and Earth.
The low tide is the lowest tide level which can be predicted to occur under average
meteorological condition and under any combination of astronomical condition where
water level seldom fall down.
Field reconnaissance was carried for fixing suitable base and reference station. The
static observations were taken at base and reference station using DGPS for a
period of about 2 hours to obtain geographical position of the base and reference
station in World Geodetic System 84 (WGS84) datum. The baseline is thus formed
by joining these established base and reference station. Total station was setup over
a base station and prism stand was kept at reference station simultaneously in order
to align with the baseline for true north orientation. In order to obtain geographical
position of identified high tide line and morphological feature (extent of sand dunes),
observations were made using Total Station. These surveyed points were used for
preparation of CRZ map. The details of the equipment used during the position fixing
are presented below.
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Demarcation of high tide line, low tide line and delineation of CRZ boundaries for proposed rerouting of 42”
SBHT line of ONGC at Umbharat beach, Gujarat. NIO/SP-01/2015
2.2 Equipment
2.2.1 Ceeducer ProTM
Ceeducer ProTM is a versatile survey measuring instrument that provides GPS
position along with differential correction from marine beacon.
Features
Position display in latitude/ longitude or
grid co-ordinates. Online data can be
logged and transferred to P.C. using RS
232 connecting cable.
Specification
Number of channels: 12;
Accuracy: ±1m (DGPS combined Marine
Beacon).
Global Positioning System (GPS)
The Global Positioning System (GPS) is a
satellite based navigation and surveying system
which was mainly developed and deployed for
the determination of precise positioning. GPS is
primarily a navigation system for real-time
positioning.
This
technique
overcomes
the
numerous limitations of terrestrial surveying
methods, like the requirement of inter-visibility of
survey stations, dependability on weather, difficulties in night observations, etc.
These advantages over the conventional terrestrial techniques, and the economy of
operations made GPS the most promising surveying techniques.
Differential Global Positioning System (DGPS)
Differential Global Positioning System (DGPS) is an enhancement to Global
Positioning System using network of fixed ground based reference stations to
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Demarcation of high tide line, low tide line and delineation of CRZ boundaries for proposed rerouting of 42”
SBHT line of ONGC at Umbharat beach, Gujarat. NIO/SP-01/2015
broadcast the difference between the positions indicated by the satellite systems and
the known fixed positions. These stations broadcast the difference between the
measured satellite pseudo range and actual (internally computed) pseudo ranges,
and receiver stations correct their pseudo ranges by the same amount.
2.2.2 LasertrakTM
The tripod mounted LasertrakTM
instrument, located on fixed reference points, is
designed to provide fast, accurate and logistically simple positioning of dynamic
vessels and barges. Other application includes hydrographic surveying of lakes and
rivers. LasertrakTM is an electronic instrument, which measures distances by timing
the passage of a light pulse fired at a target. Angles are measured by optical
encodes and elevation by electrolytic liquid level
and /or optical encoders.
Technical Specifications: The instrument is
constructed of machined aluminium and housed
in a water and dust proof jacket.
Laser
Type
:
Accuracy
Measuring time
:
:
Semiconductor
±20cm
0.5 seconds
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Demarcation of high tide line, low tide line and delineation of CRZ boundaries for proposed rerouting of 42”
SBHT line of ONGC at Umbharat beach, Gujarat. NIO/SP-01/2015
Vertical Angle
Type: Automated Electrolyte Sensor
Accuracy
:
0.25º
Resolution
:
0.01º
Range
:
±40º
Horizontal Angle
Type: Automated Electrolyte Sensor
Accuracy
:
0.01º
Range
:
0º to 360º
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Demarcation of high tide line, low tide line and delineation of CRZ boundaries for proposed rerouting of 42”
SBHT line of ONGC at Umbharat beach, Gujarat. NIO/SP-01/2015
3.0 DATA ACQUISITION, RESULTS AND INTERPRETATION
3.1
Data Acquisition
To meet the requirements of scope of work, CSIR-National Institute of
Oceanography, Goa undertook the work and carried out detailed survey along
Umbharat beach (Fig. 1). The survey’s for HTL, LTL, morphological features and
environmental sensitive areas were carried out in the month of November 2014 to
delineate CRZ boundary and classify them. Integration of all these information is
required to conclude the suitability of the area for development vis-a-vis coastal
regulation. Approved CZMP of Government of Gujarat was referred for the
preparation of this report.
The high tide line was demarcated by physical walking along the high tide line over
the survey area following the procedure defined in the notification by the MoEF. The
horizontal position of high tide line associated with wave run up at preceding high
tides and forming geomorphic features such as landward (monsoonal) berm crest
and base of sand dunes have been considered. The identification of these markings
enabled a reasonably accurate assessment of high tide line.
The location of high tide line were identified at an interval of 30 to 50 m along the
coast depending upon the topography. The position of these identified points were
obtained using Differential Global Positioning System (DGPS: Ceeducer ProTM) and
optical distance measuring equipment (Total station: LasertrakTM ).
Low water line is the level of water which is approximately the level of lowest
Astronomical tide. It is demarcated by running the small fishing boat (Dingi)
perpendicular to coast at regular interval. Real time position and raw sounding were
recorded using Ceeducer ProTM . These sounding were reduced to chart datum by
using predicted tide.
The positions recorded for demarcation of high tide line and low tide line were plotted
and from this, CRZ boundaries were delineated and map is prepared on scale of
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Demarcation of high tide line, low tide line and delineation of CRZ boundaries for proposed rerouting of 42”
SBHT line of ONGC at Umbharat beach, Gujarat. NIO/SP-01/2015
1:4000 (Fig. 2) annexed at the end of the report. All the measurements were made in
meters and decimeters.
Geomorphological observations were made along the coastal plain of the proposed
site at Umbharat beach.
3.2 Presentation of Maps
The observations in respect of HTL, LTL and setback lines were presented in the
map in the scales of 1:4000 (Fig. 2). The legend for different demarcations like HTL,
LTL, morphological features, existing pipeline and proposed 42” SBHT pipeline are
also given in the CRZ map. The set back lines of 200m and 500m in the open sea
from the HTL were drawn in the map.
3.3 Observations and Results
The following relevant features were outlined through the perception and judgment of
the CSIR-NIO team carried out the CRZ survey/mapping.
3.3.1 Geomorphology
The study site covers a part of Umbharat beach and village, Gujarat. The gently
sloping beach is covered with loose sand. Sand dunes are observed all along the
relevant coast (Plate 1a & 1b). The sand dunes vary in a height approximately 2-4 m
and run parallel to the coast line (Plate 2a & 2b). The sand dunes extends towards
the Umbharat village. At few places sand dunes are reduced for recreational facilities
to general public. Tea/Coffee shops and other small scale commercial activities are
also observed over the reduced sand dunes (Plate 6a & 6b).
All along the coast at the study site the sand dunes are covered with natural
vegetation facing towards the sea.
The natural vegetation consists of small to
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Demarcation of high tide line, low tide line and delineation of CRZ boundaries for proposed rerouting of 42”
SBHT line of ONGC at Umbharat beach, Gujarat. NIO/SP-01/2015
medium high thorny shrubs ranging in height between 2 and 3 m (Plates 1a & 1b, 2a
& 2b). The growth of these shrubs is nearly continuous along the sand dunes. This
natural vegetation shows that these sand dunes are stabilized. Along with natural
vegetation the sand dunes also consists of 5 to 8 m high Eucalyptus trees at certain
places. These trees are behind the natural vegetation and are towards the village.
These Eucalyptus trees were planted systematically after clearing the top portion of
the sand dunes (Plate 4b) . At some places along the corridor of proposed 42” SBHT
line of ONGC a portion of sand dune is overlain by approximately 20cm thick soil
with green Vegetation (Plate 5b).
Presence of soil over sand dunes clearly
establishes that the sand dunes are stabilized. The corridor of the proposed 42”
SBHT line route cuts through the sand dunes (Plate 5a).
3.3.2 Coastal Regulation Zones
Factors and Observations:
Factors:
The Ministry of Environment and Forests, Govt. of India as per CRZ notification
dated 6th January 2011 declares the following areas as CRZ:
(i) the land area from High Tide Line (HTL) to 500 m on the landward side along the
sea front.
(ii) the land area between HTL to 100 m or width of the creek whichever is less on
the landward side along the tidal influenced water bodies.
(iii) the land area falling between the hazard line and 500 m from HTL on the
landward side, in case of seafront and between the hazard line and 100 m line in
case of tidal influenced water body.
(iv) the land area between HTL and LTL termed as the intertidal zone.
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Demarcation of high tide line, low tide line and delineation of CRZ boundaries for proposed rerouting of 42”
SBHT line of ONGC at Umbharat beach, Gujarat. NIO/SP-01/2015
(v) the water and the bed area between the LTL to the territorial water limit (12 Nm)
in case of open sea and the water and the bed area between LTL at the bank to
the LTL on the opposite side of the bank in case of tidal influenced water bodies.
The CRZ notification 2011 restricts the setting up and expansion of any industries,
operations or processes and manufacture/handling/storage/disposal of hazardous
substances in the said Coastal Regulation Zone.
A key component of the coastal regulation zone are the setback lines measured from
the high tide line through which coastal development is regulated in a protected zone
contiguous to HTL. These setback lines are with reference to the HTL and act as
buffer zones between the ocean and the upland property. Thus precision is required
in delineating the high tide line which forms the base to define the setback.
•
The classification of Coastal Regulation Zone as per CRZ Notification 2011
(CRZ-I):
A) Areas that are ecologically sensitive and the geomorphological features
which play a role in the maintaining the integrity of the coast.
B) Area between Low Tide Line and the High Tide Line.
(CRZ-II):
The areas that have already been developed upto or close to the shoreline.
For this purpose, “developed area” is referred to as that area within the
municipal limits or in other legally designated urban areas which is already
substantially built up and which has been approved with drainage and
approach roads and other infrastructural facilities, such as water supply and
sewerage mains.
(CRZ-III):
Areas that are relatively undisturbed and those which do not belong to either
CRZ-I or II.
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Demarcation of high tide line, low tide line and delineation of CRZ boundaries for proposed rerouting of 42”
SBHT line of ONGC at Umbharat beach, Gujarat. NIO/SP-01/2015
(CRZ-IV):
A) The water area from the Low Tide Line to twelve nautical miles on the
seaward side;
B) Shall include the water area of the tidally influenced water body from the
mouth of the water body at the sea upto the influence of tide which is
measured as five parts per thousand during the driest season of the year.
•
As per the provisions of CRZ Notification 2011, manufacture or handling oil
storage or disposal of hazardous substance are declared as prohibited
activities within the CRZ, except transfer of hazardous substances from
ship to ports, terminals and refineries and vice versa and facilities for
receipt and storage of petroleum product and liquefied natural gas [Para
3(ii)(a) & (b)].
•
As per Para 4(ii)d of CRZ Notification 2011, laying of pipelines, conveying
systems, transmission lines; are permissible activities in CRZ area.
• AS per the CRZ Notification 2011, [Para 8 (i) (I)(i)(b), no new construction
shall be permitted in CRZ-I except pipelines, conveying systems including
transmission lines.
•
The guidelines of approved Coastal Zone Management Plan of Gujarat was
referred for the preparation of this report.
•
Co-ordinates proposed route of 42” SBHT line provided by ONGC are as
follows:
SR. NO
POINT
UTM CO-ORDINATES
EASTING (M)
NORTHING (M)
1
HK-01
264062.933
2325305.566
2
HDD ENTRY
264322.920
2325513.561
3
HDD EXIT
264351.275
2326663.237
4
HK-02
264386.288
2326981.743
19
Demarcation of high tide line, low tide line and delineation of CRZ boundaries for proposed rerouting of 42”
SBHT line of ONGC at Umbharat beach, Gujarat. NIO/SP-01/2015
Observations:
The following relevant features were outlined through the perception and
judgment of the CSIR-NIO team carried out the CRZ survey/mapping.
•
Existing pipeline exposed and shifted towards the sea is seen at Umbharat
beach (Plate 3a & 3b).
•
Damaged protection measures is also seen at Umbharat beach (Plate 3a &
3b).
•
The proposed rerouting of 42’’ SBHT line of ONGC is located at Umbharat
beach, Village Umbharat, Navasari district, Gujarat and are undeveloped
area.
•
The relevant coast for the proposed rerouting of 42” SBHT line of ONGC at
Umbharat beach is open coast of Arabian Sea (Fig. 1).
•
Sand dunes are observed along the relevant coast of the proposed rerouting
of 42” SBHT line of ONGC at Umbharat beach (Plates 1a & 1b, 2a & 2b).
•
The area between HTL and 500 m setback line is mostly covered with sand
dunes, and vegetation like thorny shrubs and Eucalyptus trees (Plates 2a &
2b , 4a & 4b).
•
The sand dunes noticed near the coast and beyond the high water line are
mostly covered with natural vegetation such as small to medium high thorny
shrubs ranging in height between 2 and 3 m. The growth of these shrubs is
nearly continuous along the sand dunes (Plates 1a & 1b, 2a & 2b).
•
Along with natural vegetation the sand dunes also consists of 5 to 8 m high
Eucalyptus trees at certain places. These Eucalyptus trees are observed to be
planted systematically after clearing the top portion of the sand dunes (Plate
4b).
20
Demarcation of high tide line, low tide line and delineation of CRZ boundaries for proposed rerouting of 42”
SBHT line of ONGC at Umbharat beach, Gujarat. NIO/SP-01/2015
•
The major portion of the corridor of proposed rerouting of 42” SBHT line of
ONGC at Umbharat beach passes through the sand dunes (Fig. 2, Plate 5a &
5b)
•
Along the corridor of proposed rerouting of 42” SBHT line of ONGC a portion
of sand dunes covering approximately with 20cm thick soil was noticed.
Green vegetation is seen on this soil cover (Plate 5b)
•
The Tourism activity is observed at the Umbharat beach(Plate 6a & 6b).
•
The HTL and LTL may change if any of the existing morphological
features are altered.
21
Demarcation of high tide line, low tide line and delineation of CRZ boundaries for proposed rerouting of 42”
SBHT line of ONGC at Umbharat beach, Gujarat. NIO/SP-01/2015
4.0
SUMMARY AND CONCLUSIONS
Based on the precise policy, practice and procedure of MoEF, the following
conclusions have been drawn. Whenever, there is an ambiguity, the perception and
judgment of the CSIR-NIO team who carried out the CRZ mapping, is prevailed.
•
The relevant coast for the proposed rerouting of 42” SBHT line of ONGC at
Umbharat beach is open coast of Arabian sea (Fig. 1).
•
CRZ mapping for the proposed rerouting of 42” SBHT line of ONGC at
Umbharat beach were carried out along the relevant coastal front around
proposed site in November 2014 (Plate 1a & 1b).
•
The corridor co-ordinates of proposed route of 42” SBHT line is provided and
identified by ONGC and the same is verified and depicted in the map. Also the
existing pipe line is identified by ONGC and same is surveyed and marked in
the map (Fig. 2).
•
Sand dunes are observed along the relevant coast of the proposed rerouting
of 42” SBHT line of ONGC at Umbharat beach and same are considered as
the identification marker for HTL and used for the demarcation (Plates 1a &
1b, 2a & 2b).
•
The area between HTL and 500 m setback line is mostly covered with sand
dunes, and vegetation like thorny shrubs and Eucalyptus trees (Plates 2a &
2b , 4a & 4b).
•
The sand dunes noticed near the coast and beyond the high water line are
mostly covered with natural vegetation such as small to medium high thorny
shrubs ranging in height between 2 and 3 m. The growth of these shrubs is
nearly continuous along the sand dunes. This natural vegetation shows that
these sand dunes are stabilized (Plates 1a & 1b, 2a & 2b).
22
Demarcation of high tide line, low tide line and delineation of CRZ boundaries for proposed rerouting of 42”
SBHT line of ONGC at Umbharat beach, Gujarat. NIO/SP-01/2015
•
Along with natural vegetation the sand dunes also consists of 5 to 8 m high
Eucalyptus trees at certain places. These Eucalyptus trees are observed to be
planted systematically after clearing the top portion of the sand dunes (Plate
4b).
•
The major portion of the corridor of proposed rerouting of 42” SBHT line of
ONGC at Umbharat beach passes through the sand dunes (Fig. 2, Plate 5a &
5b)
•
Along the corridor of proposed rerouting of 42” SBHT line of ONGC a portion
of sand dunes covering approximately with 20cm thick soil was noticed.
Green vegetation is seen on this soil cover (Plate 5b). Presence of soil over
sand dunes clearly establishes that the sand dunes are stabilized.
•
CRZ map indicating HTL, LTL, CRZ boundaries and existing pipeline and the
corridor for the proposed rerouting of 42” SBHT line of ONGC is prepared in
the scale of 1:4000 and are annexed to this report (Fig. 2).
•
The setback line of 200 and 500 meters in open sea delineated along
landward side of the HTL configuration (Fig. 2).
•
The CRZ classification of the survey area for the proposed rerouting of 42”
SBHT line of ONGC at Umbharat beach are as follows:
¾ The area upto 200 m from HTL in open sea is demarcated as No
Development Zone (NDZ).
¾ The land area between HTL and 500 m setback line in open sea has
been classified as CRZ-I(A) (Fig. 2).
¾ The area between LTL and HTL is termed as the intertidal zone and
same is classified as CRZ-I(B).
¾ The water covered area from LTL to twelve nautical miles on the
seaward side is classified as CRZ-IV.
•
The CRZ map indicates that (i) Major portion of the proposed rerouting of 42”
SBHT line of ONGC at Umbharat beach falls in the CRZ-I(A) and CRZ-I(B) .
23
Demarcation of high tide line, low tide line and delineation of CRZ boundaries for proposed rerouting of 42”
SBHT line of ONGC at Umbharat beach, Gujarat. NIO/SP-01/2015
•
As per the provisions of CRZ Notification 2011, manufacture or handling oil
storage or disposal of hazardous substance are declared as prohibited
activities within the CRZ, except transfer of hazardous substances from
ship to ports, terminals and refineries and vice versa and facilities for
receipt and storage of petroleum product and liquefied natural gas [Para
3(ii)(a) & (b)].
•
As per Para 4(ii)d of CRZ Notification 2011, laying of pipelines, conveying
systems, transmission lines; are permissible activities in CRZ area.
•
AS per the CRZ Notification 2011, [Para 8 (i) (I)(i)(b), no new construction
shall be permitted in CRZ-I except pipelines, conveying systems including
transmission lines.
•
The Tourism activity is observed at the Umbharat beach (Plate 6a & 6b).
•
The HTL and LTL may change if any of the existing morphological
features are altered.
24
Demarcation of high tide line, low tide line and delineation of CRZ boundaries for proposed rerouting of 42”
SBHT line of ONGC at Umbharat beach, Gujarat. NIO/SP-01/2015
5.0 ACKNOWLEDGEMENTS
We express our grateful thanks to the Director, CSIR-NIO, Goa for permission to
take up this work & providing all necessary facilities, and Dr. A.K. Chaubey for
reviewing the report. We also express our gratitude to the officials of ONGC for
providing necessary administrative support in the field during data acquisition.
25
Demarcation of high tide line, low tide line and delineation of CRZ boundaries for proposed rerouting of 42”
SBHT line of ONGC at Umbharat beach, Gujarat. NIO/SP-01/2015
6.0 SELECTED BIBLIOGRAPHY
Approved Coastal Zone Management Plan of Gujarat, Government of India, Ministry
of Environment & Forests, Dated 27th September 1996.
The Coastal Regulation Zone Notification-2011. Ministry of Environment and
Forests, (Department of Environment, Forest & Wild life), New Delhi, 6th January,
2011.
26
.
21°3'0"N
21°2'30"N
21°2'0"N
21°1'30"N
Existing pipeline
Proposed 42" SBHT pipeline
21°1'0"N
0
21°0'30"N
0.5
1 Kilometers
Source of Data: Google Earth
72°42'30"E
72°43'0"E
72°43'30"E
72°44'0"E
72°44'30"E
72°45'0"E
72°45'30"E
72°46'0"E
Fig.1 Google image showing general physiography around the proposed site of rerouting of 42" SBHT line of
ONGC located at Umbharat beach, Gujarat.
Plate 1a
Thorny shrubs
Sand dunes
HTL
Intertidal Zone
Plate 1b
Sand dunes
HTL
Thorny shrubs
Intertidal Zone
Plate 1a & 1b: Photographs showing HTL, sand dunes and vegetation at
Umbharat beach, Gujarat.
Plate 2a
Vegetation
Thorny shrubs
Sand dunes
HTL
Plate 2b
HTL
Thorny shrubs
Vegetation
Sand dunes
Plate 2a & 2b: Photographs showing general physiography along the
Umbharat beach, Gujarat.
Plate 3a
Protection measures
Existing pipeline
Plate 3b
Existing pipeline
Protection measures
Plate 3a & 3b: Photographs showing exposed existing pipeline and its
protection measures at Umbharat beach, Gujarat.
Plate 4a
Vegetation
Thorny shrubs
Corridor of proposed
42” SBHT pipeline
Plate 4b
Eucalyptus trees
Corridor of proposed
42” SBHT pipeline
Plate 4a & 4b: Photographs showing corridor of proposed 42” SBHT pipeline
and systematic plantation of Eucalyptus trees at Umbharat Village.
Plate 5a
Thorny shrubs
Sand dunes
Corridor of proposed
42” SBHT pipeline
Plate 5b
Soil overlay
Thorny shrubs
Sand dunes
Plate 5a & 5b: Photographs showing general physiography along the
corridor of proposed 42” SBHT pipeline at Umbharat Village.
Plate 6a
Tourist
Umbharat beach
Plate 6b
Refreshment stall
Umbhrat beach
Plate 6a & 6b: Photographs showing tourism activity at Umbharat beach.