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Modeling of the flood regimes in coupled stream-aquifer systems

Abstract : In this study, hydrogeological modeling of the Somme river basin situated in the north of France was made with special emphasis on the stream-aquifer interaction. The coupled model was used. Geographic Information Systems (GIS) tools were incorporated during all the stages of modeling process for both preparation of input data and visualization of the results of simulations. The process began with extracting spatial information on the basin by using Digital Elevation Model (DEM) analysis. Afterwards, the surface and aquifer grids were generated by using nested grid generators and refinement was made on the stream network and subcatchment boundaries. In order to run the surface model, meteorological forcing, land use and soil type data were acquired. Surface model was used to partition the precipitation into evapotranspiration, infiltration and surface runoff components. A steady-state piezometric head distribution was computed by the groundwater model. The flow in the unsaturated zone was simulated by using Nash cascade model. The unsteady groundwater and surface flow simulations were performed by taking into consideration the stream-aquifer interaction on a daily time step. The calibration and validation were realized by using the streamflow and piezometric head measurements distributed around the basin. The strong groundwater influence on the hydrologic behavior of the basin is well represented by the model. Comparisons of predicted flooded areas in year 2001 were made with other models and a satellite derived image. In the end, several sensitivity analyses were performed for several parameters concerning the groundwater flow to guide future field data collection.
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Submitted on : Thursday, February 21, 2008 - 8:00:00 AM
Last modification on : Wednesday, November 17, 2021 - 12:31:12 PM
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  • HAL Id : pastel-00003360, version 1


Serdar Korkmaz. Modeling of the flood regimes in coupled stream-aquifer systems. Sciences of the Universe [physics]. École Nationale Supérieure des Mines de Paris, 2007. English. ⟨NNT : 2007ENMP1495⟩. ⟨pastel-00003360⟩



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