Contact persons: - F. Bruchon- Seine Normandy Water Agency

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Presentation transcript:

Implementation of the WFD on Coastal and Transitional Waters French work on Typology Contact persons: - F. Bruchon- Seine Normandy Water Agency (bruchon.franck@aesn.fr) - Y. Auffret - Ministry of Environment (yves.auffret@environnement.gouv.fr) Main scientific contributors: - P. Lazure & B.Beliaeff - French Institute for Sea Research (Ifremer)

Organisation A specific working group for C&T waters created in july 2001 Selection of System B Pertinence and data accessibility for each factor Methodology - Testing factors - which are most pertinent for French T&CW ? - Defining ecologically relevant limits - TW / CW - water body types 3 steps approach 1. Methody Def° on a pilot case: Seine Normandy 2. Applicability test on Mediterranea 3. Methody finaliz° + global scale application

State of data availability

Typology Factors Obligatory factors latitude, longitude, salinity, tidal range Optional factors Hydrodynamic factors : renewal of waters mixing capacity transport Morphological factors size of tidal zone, average depth substrate composition Work hypothesis coherence in scale with water management units (10-50 km)

SALINITY - Distinction of TW & CW TW = partially saline waters, influenced by freshwater inputs Limit : a mean annual salinity value: 25‰ Result : TW restricted to estuaries Variation of number of species along salinity gradient (Remane et Schliefer 58) Ex. interannual salinity variation in the vicinity of Loire estuary

CW & TW

SALINITY:Influence of large estuaries Extension of freshwater inputs : use of a dessalination level (e.g. - 2‰) Cugier & Le Hir 2001 Seine Loire + Gironde

Influence zone of the Seine estuary

TIDAL RANGE Very contrasted along French coasts : 0.5m-11m No direct correspondance between tidal range and currents No discrimination of water renewal characteristics Proposition :Define 3 classes 0-1m ( Mediterranea,DOM) 1-4m ( Atlantic) 4-11m ( English Channel) Tidal range  strenghten ecoregion definition by latitude and longitude  used further into hydrodynamic factors (importance of tidal currents) and morphological factors (size of tidal zone)

Renewal of waters - Vertical mixing Vertical mixing is induced by turbulence Turbulence is generated at the surface and on the bottom Bottom turbulence intensity generally depends upon the speed of tidal currents

Renewal of waters - Vertical mixing Stratification factor H/U3 (Simpson et Hunter 74)

Mixing

Renewal of waters -Residual currents Residual currents :1-10 cm/s ( ~1-10 km/d) Salomon, Breton 1991

Renewal of waters -Residual currents 4 zones : Mt St Michel-Carteret (medium c.) Carteret-Pointe de Barfleur (strong c.) Pointe de Barfleur-Grandcamp (strong c. + loop) Grandcamp-Tréport (medium c.)

Residual current

Bottom characteristics Average depth or surface of the tidal zone defines similar types on English Channel coast depth more relevant for Mediterranea Nature of superficial sediments

Mean depth

RESULT 4 factors : salinity mixing mean depth

10 water bodies : 9 CW + 1 TW

Types of water bodies