Land management scenario modeling for alleviating impacts on water resources
Modélisation de scénarios d'aménagement du territoire pour atténuer les impacts sur les ressources en eau
Résumé
This is at river basin level that European policy rules are adapted so as to alleviate the negative environmental impacts regarding water shortage and water quality and climate change. And this is at this process-based level that biophysical effects can be assessed by SWAT in their spatial and temporal dimensions, in relation to land-use and land cover change (LULC) and climate change (CC) scenarios. We developed the integrated modeling of agricultural scenarios (IMAS) method, so as to supply water managers with an integrated and collaborative approach to analyzing changes in land use, farming systems, and practices and to assess their effects on agricultural pressure and pesticide transfers to waters, in the context of climate change. The Generator of landuse version 2 (GenLU2) has been adapted, so as to be used within the SWAT management operation module. Two methods have been compared for the SWAT model calibration, the Parameter Estimation and Uncertainty Analysis (PEST) tool and the Sequential Uncertainty Fitting (SUFI2) algorithm. As a result, the IMAS method has been developed and validated on two drinking water catchment areas affected by diffuse pollution and the methods and tools are transferred to local water managers.