FN Archimer Export Format
PT J
TI Vers une modélisation opérationnelle du devenir des nutriments dans la bande côtière bretonne
TI Towards operational modelling of the fate of nutrients in the coastal zone off Brittany (France)
BT 
AF Pénard, Cédric
   Ménesguen, Alain
   Dumas, Franck
   Guillaud, Jean-Francois
AS 1:1;2:1;3:1;4:1;
FF 1:;2:PDG-ODE-DYNECO;3:;4:PDG-ODE-DYNECO;
C1 Département DYNECO, IFREMER Brest Technopôle Brest-Iroise BP 70 29280 Plouzané, France
C2 IFREMER, FRANCE
SI BREST
SE PDG-ODE-DYNECO
IN WOS Ifremer jusqu'en 2018
IF 0.129
TC 1
UR https://archimer.ifremer.fr/doc/00480/59153/61782.pdf
LA French
   English
DT Article
AB Eutrophication of French Brittany coastal shelf is a recurrent problem, more and more worrying. This eutrophication exhibits two main forms :– “green tides”, which are constituted by local proliferations and strandings of green macro-algae (particularly the Ulva species) in nitrogen-enriched areas.– phytoplanktonic blooms, which are responsible of coloured water events. Toxic species can be present (Pseudonitzschia, Alexandrium, Dinophysis), and induce banning of shellfish consumption.Several programs and directives compel authorities to initiate actions in order to diminish these problems. (WFD, OSPAR). This implies a better understanding of these phenomena.This work deals with the influences of the plumes of Loire, Vilaine and bay of Brest rivers (Elorn and Aulne) on the nitrate enrichment of the French Brittany coastal shelf. A 3D hydrodynamic model, MARS 3D, is used. The nitrate is considered as a conservative tracer, which is advected and dispersed by the model. Thanks to the introduction of 4 different tracers, we can distinctively follow the nitrate from Loire, Vilaine, Bay of Brest rivers and other rivers.The study shows that the Loire river influences the southern and western parts of coastal shelf of Brittany. The plume propagates up to the north of Iroise sea, and contributes for a large part to its enrichment. On the other hand, the high enrichment of the bay of Brest remains confined and is smoothly dispersed in Iroise sea, except during flood events : in this case, nitrate jets are pulsed into the Iroise sea. 
PY 2007
PD OCT
SO La Houille Blanche
SN 0018-6368
PU EDP Sciences
IS 5
UT 000251271100009
BP 62
EP 67
DI 10.1051/lhb:2007061
ID 59153
ER

EF