La Houille Blanche
Number 3-4, Juin 1990
|Page(s)||237 - 242|
|Published online||01 October 2009|
La modélisation des " marées vertes " littorales et ses applications
Modelling Ulva coastal mass blooms with applications
IFREMER, Centre de Brest, BP 70, 29280 Plouzané
Excessive proliferation of UIva sp. (Chlorophyta) during spring and summer was responsible for increasing injuries to recreational use of several beaches of Britanny (France) during the last decade. These worldwide mass blooms are well known in eutrophicated lagoons (Venice, Tunis... ), but look paradoxical along open beaches with large tidal range and weak terrestrial nutrients inputs. Numerical modelling of the coupled physical and biological aspects clearly explains the Ulva mass blooms by the dynamical trapping of water masses in bays where tidal residual drift vanishes, and shows the main responsability of the increase of nitrogen inputs (of agricultural sources) in triggering the recent magnification of a natural phenomenon.
© Société Hydrotechnique de France, 1990
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