The three major french estuaries
Seine
Loire
Gironde
Water catchment area
79 000
118 000
71 000
(km2)
Estuary area (km2)
50
60
635
Tidal intrusion (km from
160
95
150
sea)
(limited by a dam)
Maximal ?dal range (m)
8
6
5
Mean freshwater
480
850
800 à 1000
discharge (m3.s-­‐1)
High freshwater
2200
1000 to 2000 1000 to 2000
discharge (m3.s-­‐1)
Low freshwater discharge
100
200 -­‐ 500
100 à 300
(m3.s-­‐1)
TMZ (t)
20 000
800 000
4 000 000
to 400 000
to 1 000 000 to 5 000 000
Mean water residence
25-­‐30
15 – 40
30 – 80
?me (day)
TiDE -­‐ 08/06/2011
The « Groupement d’Intérêt Public »
Seine-­‐Aval
What is a GIP ?
A public structure with a legal status for cooperaNon between public and private
structures : the members (funders)
Created to reach common goals
Has a determinate life Nme
The GIP Seine-­‐Aval (downstream part of the Seine river)
Established since 2003 (2003-­‐2006 ; 2007-­‐2012 ; ????)
11 members
Mission : managing a research program in order to establish facts in the
environment field on the Seine estuary and make them known to our members,
to the scienNfic community, to the estuary’s stakeholders and to the public
TiDE -­‐ 08/06/2011
Thema?cs and ac?vi?es
ThemaNcs
Global estuarine ecosystem funcNoning
Water and sediments quality
Hydrodynamics and sediments transportaNon
Fauna and flora health
RelaNons between Man and the estuary
…
Knowledge and data acquisiNons
A research program : 32 projects – 50 laboratories
Specific studies (Lidar acquisiNons, river banks
mapping ….)
Synthesis studies (learning form restoraNons
projects on others estuaries …)
…
Tools development
Estuarine dashboard
Numerical modeling (in Q3 2011)
GIS (for links between species, habitats and
funcNonaliNes: funcNonal habitats)
…
CommunicaNon
23 booklets (30 to 50 pages)
25 fact sheets (6 pages)
Synthesis reports (chemical contaminaNon, PCB’s,
flooding …)
InformaNon legers
…
TiDE -­‐ 08/06/2011
Salinity
intrusion limit
Tidal propaga+on
limit (dam of
Poses)
spring tide
neap tide
TiDE -­‐ 08/06/2011
WFD , D on the assessment and management of flood risks, regional health and environment plan
Quelques éléments de contexte
Flux
GPMR
Dredging : ProlongaNon
of the Kannik deposit
site
New deposit site at
Machu
GPMH
New LogisNcs Plahorm
Extension of the channel
Eutrophica+on
Chemical contamina+on
and mud accre+on
GPMR
Channel deepening
TiDE -­‐ 08/06/2011
Restora?on
GIP missions on restoraNon :
Define restoraNon objecNves at the global estuary scale for the WFD and local
projects
conceptual quesNon : what do we want ? what does good ecological status means
? Does it mean something for (french) scienNsts ? (BEEST project)
Locate, describe potenNal restoraNon sites, study some of them
(Inventory of potenNal restoraNon sites in the Seine estuary, DEFHFIS and IBIS
research projects)
Determine the consequence of new (economical) projects on the estuarine
ecological funcNons (GIS funcNonal habitats)
Share knowledge and experiments from other estuarine restoraNon projects
(study : learning form restoraNon projects on others estuaries -­‐ RIVE)
Build methodological guides about the management of restoraNon projects
Monitor the estuarine environment evoluNon (to evaluate the global
consequences of restoraNon projects)
TiDE -­‐ 08/06/2011
Inventory of poten?al restora?on
sites in the Seine estuary
Planning Scheme
Grande Seine 2015
- CG 76&27
- GPMR
- CREA (Rouen
agglomeraNon)…
Restora?on Technical
Group (2008 – 2010)
Scien+sts, ins+tu+onal
stakeholders
Inventory of potenNal
restoraNon sites
Data base
Descrip+on of ~90 sites
-Ecological environment (creeks,
banks, wetlands,…)
-Func?ons (feeding, repos,
reproducNon…)
-Constraints land, socials, legal
-Types of restora?on projects
-Time es?ma?on for realiza?on
-...
Projects accompaniment
MiNgaNon and compensaNons
measures (GPMH, GPMR …)
- State, AESN : WFD
- CREA : pedagogical value ?
CD-­‐Rom
TiDE -­‐ 08/06/2011
Inventory of poten?al restora?on
sites in the Seine estuary
CD-­‐ROM
TiDE -­‐ 08/06/2011
Inventory of poten?al restora?on
sites in the Seine estuary
2011 – web site
TiDE -­‐ 08/06/2011
GIS func?onal habitats
SpaNal model of the role of estuarine habitats of the Seine for
different species
Territory :
CollaboraNon:
Local : Maison de l’estuaire et PNRBSN
NaNonal : GIP Loire Estuaire and CEMAGREF (Gironde) – Liteau BEEST project
50 benthic species, 27 fishes species, 61 birds species
TiDE -­‐ 08/06/2011
GIS func?onal habitats
…
Species
factsheets
GIS layers
(potentiality for a species
to be present depending
on different factors)
Bathymetry
Substrate
Salinity
Spatial request
1
Table for habitats
preferences
Maps of potential
habitats
2
Observations
data base
Comparisons between
potential habitats and
realized habitats (field
observations)
Other factors ?
TiDE -­‐ 08/06/2011
GIS func?onal habitats
Exemple : Abra alba (adult)
Sedimentary facies :
Salinity :
35
Bathymétry :
9
-1
19
-5
-6
10
0
-22
TiDE -­‐ 08/06/2011