Quels apports hydrologiques pour les modèles hydrauliques? Vers un modèle intégré de simulation des crues

Abstract : Hydraulic models are frequently used in river management and flood prevention studies. These models calculate water levels and discharges on a river reach based on its geometry and its boundary conditions: the upstream discharge, the lateral inflows from the intermediary area and the downstream water level. When he river reach is long, lateral inflows become important, but they are seldom measured since they originate from minor tributaries. Their estimation is an ssential phase of flood simulation because it can lead to substantial under- or over-estimation of the hydraulic variables. The main objective of this doctoral thesis is to identify a method of minimal complexity to estimate lateral inflows. Fifty river reaches in France and the United States were used as case studies on which lateral inflows were estimated with a semi-distributed hydrological model coupled with a simplified hydraulic model.

First, an automated method was developed to break the intermediary area down into sub-basins and facilitate setting-up of the semi-distributed model on the 50 river reaches. Second, the sensivity of the model's results was analysed in terms of the number of sub-basins, the uniform or distributed nature of the rainfall inputs and of the hydrological model's parameters. A four-sub-basins configuration with a uniform rainfall input and a uniform set of parameters provided the most satisfactory results.

Finally, an alternative method to calculate lateral inflows was proposed based on the transposition of the upstream flow measurements and the combination with the output of the hydrological model
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Submitted on : Friday, June 5, 2009 - 11:32:15 PM
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Julien Lerat. Quels apports hydrologiques pour les modèles hydrauliques? Vers un modèle intégré de simulation des crues. Hydrologie. Université Pierre et Marie Curie - Paris VI, 2009. Français. ⟨tel-00392240⟩

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