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prise en compte du fonctionnement hydrodynamique dans la modélisation pluie débit des systèmes karstiques

Abstract : For a long time karst systems have been studied by statistical analysis as time series analysis. More recently, attempts to hydrological modeling were performed on these systems, with mixed success. This thesis combines two domain of research, hydrology and karst hydrogeology. In this thesis, we use the time series analysis in order to improve performance and realism of the rainfall-runoff models fit on these karst systems. For this we rely on a sample of fourteen karst systems and a set of four reservoir models. The first step allowed us to set up a state of the rainfall-runoff models applied to karst systems in the context of classical performance evaluation based on the least-squares errors. Overall the four rainfall-runoff models are able to correctly model the majority of karst systems studied. In a second step, we developed an original methodology taking into account the hydrodynamic characteristics of these systems deduced from time series analysis. Our goal is not just to have good performance on regard to least squares errors, but also to respect the hydrodynamic characteristics of such systems. For this we have developed tools to take into account the specific characteristics of these systems in two ways: * Constrain model structure based on information from time series analysis of the system. For this, we used the baseflow coefficient from the analysis of recessions. The result is a semi-automatic optimization scheme in which one of the parameters prescribed by the preliminary analysis and the others are calibrated automatically. This gives the resulting model representation of the hydrodynamic functioning of karst systems more consistent with a priori knowledge that we have these systems. * Constrain model parameters and their ability to represent the functioning of karst systems. For this, we developed a multi-objective calibration methodology to evaluate the performance of the models to reproduce both observed flow and hydrodynamic properties. The process of comparing different calibration strategies allow to improved the quality of the fit between the autocorrelation functions of simulated and observed flow rates while maintaining reasonable values of least squares errors. This approach also helps to reduce uncertainty about the parameters compared to single objective calibration strategies. Finally, we attempted to take into account the diversity of structure and the behavior of karstic systems based on the parameters obtain from the calibration of rainfall-runoff models. These parameters were compared on one hand to those commonly used in karst hydrogeology (Mangin classification) and on the other hand to model parameters representative of non-karst catchment.
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https://tel.archives-ouvertes.fr/tel-00735153
Contributor : François Moussu <>
Submitted on : Tuesday, September 25, 2012 - 2:40:37 PM
Last modification on : Thursday, December 10, 2020 - 10:49:11 AM

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  • HAL Id : tel-00735153, version 1

Citation

François Moussu. prise en compte du fonctionnement hydrodynamique dans la modélisation pluie débit des systèmes karstiques. Hydrologie. Université Pierre et Marie Curie - Paris VI, 2011. Français. ⟨tel-00735153⟩

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