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Assessment of nitrate pollution in the Grand Morin aquifers (France): Combined use of geostatistics and physically based modeling

Abstract : The objective of this work is to combine several approaches to better understand nitrate fate in the Grand Morin aquifers (2700 km2), part of the Seine basin. CAWAQS results from the coupling of the hydrogeological model NEWSAM with the hydrodynamic and biogeochemical model of river PROSE. CAWAQS is coupled with the agronomic model STICS in order to simulate nitrate migration in basins. First, kriging provides a satisfactory representation of aquifer nitrate contamination from local observations, to set initial conditions for the physically based model. Then associated confidence intervals, derived from data using geostatistics, are used to validate CAWAQS results. Results and evaluation obtained from the combination of these approaches are given (period 1977e1988). Then CAWAQS is used to simulate nitrate fate for a 20-year period (1977-1996). The mean nitrate concentrations increase in aquifers is 0.09 mgN L-1 yr-1, resulting from an average infiltration flux of 3500 kgN.km-2 yr-1.
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https://hal-mines-paristech.archives-ouvertes.fr/hal-00578265
Contributeur : Nicolas Flipo <>
Soumis le : vendredi 18 mars 2011 - 17:46:02
Dernière modification le : jeudi 24 septembre 2020 - 16:34:09

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Nicolas Flipo, Nicolas Jeannée, Michel Poulin, Stéphanie Even, Emmanuel Ledoux. Assessment of nitrate pollution in the Grand Morin aquifers (France): Combined use of geostatistics and physically based modeling. Environmental Pollution, Elsevier, 2007, 146 (1), pp.241-256. ⟨10.1016/j.envpol.2006.03.056⟩. ⟨hal-00578265⟩

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