Contribution of 3D coupled hydrodynamic-ecological modeling to assess the representativeness of a sampling protocol for lake water quality assessment
This study deals with the impact of spatio-temporal heterogeneities on the assessment of lake ecological status according to the European water framework directive (WFD). A method, based on three-dimensional coupled hydrodynamic and ecological modeling, is presented to assess the variability of lake ecological status, and to locate the most representative sampling station of Lake Geneva (France/Switzerland). Five variables used in the lake ecological status evaluation were simulated by using the free software Delft3D. The numerical simulation results showed that the simulated ecological status based on chlorophyll a and total phosphorus concentrations measured at the regulatory monitoring station depend on the choice of the sampling date. Results also indicated a strong spatial heterogeneity in ecological status that varies from “poor” to “good” along an East-West gradient. Finally, the numerical simulation results showed that the most representative point of a mean theoretical ecological quality for Lake Geneva would be located in the center of the upper basin, close to the historical sampling station.
Auteurs du document :
Frédéric Soulignac, Orlane Anneville, Damien Bouffard, Vincent Chanudet, Etienne Dambrine, Yann Guénand, Tristan Harmel, Bastiaan W Ibelings, Dominique Trevisan, Rob Uittenbogaard, Pierre-Alain Danis
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Mots clés :
Lake Geneva, lakes, 3D modeling, water quality, water framework directive, Lac Léman, lacs, modélisation 3D, qualité de l'eau, directive-cadre sur l'eau