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Contribution à la modélisation du transfert des nitrates au travers de la zone non saturée à l'échelle régionale : application au bassin de la Seine

Abstract : Nitrate contaminations observed since the 1950s in hydrosystems are an important environmental issue. To meet the quality standards (Water Framework Directive), an understanding of their dynamics is thus necessary and requires modelling work. We focus on transfer modelling through the unsaturated zone between the soil and groundwater. This medium can indeed generate significant delays between surface contamination and impact on the quality of groundwater resources. We therefore firstly studied precisely these transfers through sensitivity analyses with a physically-based model. We have also assessed the impact of water table fluctuations on these transfers within this model. In the integrated model of hydrosystems Eau-dyssée, the approach used to simulate these transfers is deliberately simplified to reduce computation time and the number of required parameters. We propose an evaluation and an improvement of this approach that permitted us to obtain a better solute transfer dynamics compared to field observations. An application of the model at the regional scale of the Seine basin, has also highlight the problems with the initialization of groundwater nitrate concentrations before the beginnings of intensive agriculture. We therefore developed a method to obtain the evolution of the median groundwater nitrate concentrations in the three main aquifers of this basin (Oligocene, Eocene, Chalk)
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https://pastel.archives-ouvertes.fr/pastel-00622536
Contributor : Bibliothèque Mines Paristech <>
Submitted on : Monday, September 12, 2011 - 2:41:12 PM
Last modification on : Thursday, September 24, 2020 - 4:34:05 PM
Long-term archiving on: : Tuesday, December 13, 2011 - 2:26:32 AM

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  • HAL Id : pastel-00622536, version 1

Citation

Élodie Philippe. Contribution à la modélisation du transfert des nitrates au travers de la zone non saturée à l'échelle régionale : application au bassin de la Seine. Hydrologie. École Nationale Supérieure des Mines de Paris, 2011. Français. ⟨NNT : 2011ENMP0023⟩. ⟨pastel-00622536⟩

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