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Registros recuperados: 4
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Détermination des "bassins récepteurs" marins des principaux fleuves français de la façade Manche-Atlantique, et de leurs rôles respectifs dans l'eutrophisation phyto-planctonique des masses d'eau DCE et des sous-régions DCSMM. Phase 1 (2013) : Calcul de scénarios optimaux à partir des " bassins récepteurs". Phase 2 (2014) : Simulation de scénarios imposés et des scénarios optimaux ArchiMer
Menesguen, Alain; Dussauze, Morgan.
- This study (granted up to 50% by the French Office for Water and Aquatic Environments ONEMA) aimed at determining by modelling (hydrodynamical/biogeochemical ECOMARS3D model) the marine "receiving basins" of the main tributaries to the French waters of the English Channel and the Bay of Biscay. Knowing the respective part of each of these marine "receiving basins" in winter nutrient distribution, some optimal scenarios of nutrient loading reduction can be computed for nitrate or phosphate in order to bring back any marine water to the Good Ecological Status regarding eutrophication, at the best efficiency/cost ratio. - The study encompasses 45 watersheds (or clusters of neighboring watersheds) which have been retained because of their sizes and flow...
Tipo: Text Palavras-chave: Zone Manche-Atlantique; Modélisation 3D; Bassins versants; Bassins récepteurs marins; Nitrate; Phosphate; Réduction d'apports; Situation "pristine"; Production primaire; Oxygène dissous; Classement DCE; Bon Etat Ecologique; Optimisation linéaire; Simplexe; Optimisation quadratique; Méthode de Beale.; English Channel; Bay of Biscay; 3D modelling; Watersheds; Receiving basins; Nitrate; Phosphate; Nutrient loading reduction; Pristine situation; Primary production; Dissolved oxygen; WFD classification; Good Ecological Status; Linear optimisation; Simplexe method; Quadratic optimisation; Beale's method..
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00333/44422/44083.pdf
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MASSILIA: Modélisation de la baie de MArSeILLe : Influence des apports Anthropiques de la métropole sur l’écosystème marin ArchiMer
Pinazo, Christel; Fraysse, Marion; Doglioli, Andrea; Faure, Vincent Martin; Pairaud, Ivane; Petrenko, Anne; Thouvenin, Benedicte; Tronczynski, Jacek; Verney, Romaric; Yohia, Christophe.
In the framework of sustainable development, the anthropogenic impact of large coastal cities on the marine ecosystem is a key issue. This project aimed to improve our knowledge in marine ecosystem response to the anthropogenic supplies (from rivers, sewage outflows and atmosphere) from large cities. In particular, the goal is to underline how the physical forcing decreases or increases the anthropogenic impact on the coastal ecosystem and the assessment of the chemical contaminant (PCB) inputs (from city to sea) and exports (from mid-sea to open sea).
Tipo: Text Palavras-chave: Apports anthropiques; Baie de Marseille; Méditerranée nord-occidentale; Modélisation 3D; MARS3D; ECO3M; Couplage physique et biogéochimique; Anthropogenic supply; Bay of Marseille; North-Western Mediterranean Sea; 3D modelling; MARS3D; ECO3M; Physical-biogeochemical coupling.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00145/25592/23739.pdf
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Modelling of circulation and dispersion of radioactive pollutants in the Japan Sea ArchiMer
Cetina, Matjaz; Rajar, Rudi; Povinec, Pavel.
A large amount of radioactive waste was deposited in the Japan Sea, at a depth of about 3 000 m by the former Soviet Union. Research was carried out to determine to what extent the surface waters could be contaminated by possible leakage from the dumped containers. A three-dimensional, non-linear, baroclinic model was used to determine the circulation and pollutant dispersion. The computations were carried out in the diagnostic mode, taking into account data on winter and summer temperature and salinity distribution. Thermohaline forcing due to strong temperatures and salinity gradients is the main forcing factor influencing the bottom circulation. Wind forcing and the inflow/outflow surface currents were also taken into account. The simulated velocity...
Tipo: Text Palavras-chave: Hydrodynamique; Modélisation 3D; Pollution radioactive; Mer du Japon; Hydrodynamic; 3D modelling; Radioactive pollution; Japan Sea.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00323/43378/42833.pdf
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Simulation de l'effet d'une variation réaliste des apports azotés et phosphorés de la Loire et de la Vilaine sur la production primaire dans la zone Loire/Vilaine ArchiMer
Dussauze, Morgan.
Cette étude financée à 50% par l’Agence de l’Eau Loire/Bretagne avait pour but de modéliser la production primaire et l’oxygène dissous dans la zone Loire/Vilaine au moyen du modèle Ifremer ECO-MARS 3D. Après validation des résultats à l’aide de données in situ et satellitaires, elle a permis de déterminer la classification DCE des différentes masses d’eaux de la zone suivant les critères ‘biomasse phytoplanctonique’ et ‘oxygène dissous’. Elle a également donné pour la première fois une idée de l’étendue de la zone potentiellement sensible à l’hypoxie. Différents scénarios de réduction des apports azotés et phosphorés (-20%, -50% et +20%) ont été réalisés. En voici les principales conclusions : -les diatomées sont assez peu sensibles aux différentes...
Tipo: Text Palavras-chave: Zone Loire/Vilaine; Modélisation 3D; Production primaire; Oxygène dissous; Classement DCE.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00061/17207/14713.pdf
Registros recuperados: 4
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