On the Use of Hydrological Models and Satellite Data to Study the Water Budget of River Basins Affected by Human Activities: Examples from the Garonne Basin of France |
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| Authors: | Eric Martin Simon Gascoin Youen Grusson Clément Murgue Mélanie Bardeau François Anctil Sylvain Ferrant Romain Lardy Patrick Le Moigne Delphine Leenhardt Vincent Rivalland José-Miguel Sánchez Pérez Sabine Sauvage Olivier Therond |
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| Institution: | 1.CNRM-GAME (Météo-France, CNRS),Toulouse,France;2.UR RECOVER,IRSTEA,Aix-en-Provence Cedex 5,France;3.UPS/CNRS/IRD/CNES,Centre d’études Spatiales de la Biosphère (CESBIO),Toulouse,France;4.INPT, UPS, Laboratoire Ecologie Fonctionnelle et Environnement (EcoLab),University of Toulouse,Castanet Tolosan Cedex,France;5.Chaire de recherche EDS en previsions et actions hydrologiques, Department of Civil and Water Engineering,Université Laval,Québec,Canada;6.UMR AGIR,INRA,Castanet Tolosan,France;7.UMR AGIR,INP Toulouse,Castanet Tolosan,France;8.CACG,Tarbes,France;9.ARVALIS - Institut du Végétal,Paris,France;10.BRGM,Ramonville-Saint-Agne,France |
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| Abstract: | Natural and anthropogenic forcing factors and their changes significantly impact water resources in many river basins around the world. Information on such changes can be derived from fine scale in situ and satellite observations, used in combination with hydrological models. The latter need to account for hydrological changes caused by human activities to correctly estimate the actual water resource. In this study, we consider the catchment area of the Garonne river (in France) to investigate the capabilities of space-based observations and up-to-date hydrological modeling in estimating water resources of a river basin modified by human activities and a changing climate. Using the ISBA–MODCOU and SWAT hydrological models, we find that the water resources of the Garonne basin display a negative climate trend since 1960. The snow component of the two models is validated using the moderate-resolution imaging spectroradiometer snow cover extent climatology. Crop sowing dates based on remote sensing studies are also considered in the validation procedure. Use of this dataset improves the simulated evapotranspiration and river discharge amounts when compared to conventional data. Finally, we investigate the benefit of using the MAELIA multi-agent model that accounts for a realistic agricultural and management scenario. Among other results, we find that changes in crop systems have significant impacts on water uptake for agriculture. This work constitutes a basis for the construction of a future modeling framework of the sociological and hydrological system of the Garonne river region. |
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