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Mise au point d'un modèle hydrologique conceptuel intégrant l'état hydrique du sol dans la modélisation pluie-débit

Abstract : Conceptual hydrological modelling fails in describing the temporal evolution of soil hydric state by the use of classic methods of soil moisture measurement. It is well known that soil hydrodynamic behaviour is highly heterogeneous in the catchment. New remote sensed techniques of measurements can provide information about the spatial variability of this data. Actual conceptual models use an index that represents the soil water content. This approach is not adapted to the use of remotely sensed data. The aim of this research is to develop a software which can estimate the soil hydric state evolution and simulate basin outflows. Thus, we wall be able to use the remotely sensed data. This study is based on two existing tools. The first is the hydrologie conceptual model GR3J which is used to simulate the runoff. The second is the physically based two layers model, issued from the "Deardorffs schema", and which is used to estimate the moisture evolution of the two soil layers. These models were calibrated apart using data from basins of different hydrodynamic and morphological characteristics. The final model is obtained by a combination of the two previous models and can provide the capacity of each of them. This study have been done on the Orgeval's catchment. The final model have been successfully validated on the Brittany region (France) where the ERS-1 project is situated. The model can run with two functional modes depending on the soil moisture data availability (simulation and assimilation).
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Submitted on : Friday, September 24, 2010 - 10:14:17 AM
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  • HAL Id : tel-00520737, version 1



Najiba Chkir. Mise au point d'un modèle hydrologique conceptuel intégrant l'état hydrique du sol dans la modélisation pluie-débit. Hydrologie. Ecole Nationale des Ponts et Chaussées, 1994. Français. ⟨tel-00520737⟩



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