# MODELISATION HYDROLOGIQUE DANS UN CONTEXTE DE VARIABILITE HYDRO-CLIMATIQUE. Une approche comparative pour l'étude du cycle hydrologique à méso-échelle au Bénin.

Abstract : The aim of this PhD is to model the hydrological behaviour of the Upper Ouémé catchment (14400 km$²$) in Benin. It is a part of the AMMA project (African Monsoon Multidiciplinary Analysis). We estimate the water balance and develop tools to predict climatic and anthropogenic impacts on water resources. First, the hydrological behaviour of the catchments and the main parts of the mesoscale water balance have been characterized. To represent the catchments under study, two parcimonious models have been applied: GR4J, an empirical generic structure, and TOPAMMA, a modified version of TOPMODEL developed during this work. To evaluate these models, a complete framework has been defined, to assess the two models in term of: (i) performance, (ii) uncertainties, (iii) realism. Although runoff simulations are similarly good, the two models show significantly different uncertainties and water balance estimations. The hydro-climatic variability experienced by the region over the last fifty years allows us to study the application of models in non stationary conditions. First, we focused our work on the use of models to detect changes in hydrological behaviour. Finally, the sensitivity of the hydrological response to changes in monsoon regime has been explored through various rainfall scenarios.
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Contributor : Matthieu Le Lay <>
Submitted on : Tuesday, November 28, 2006 - 5:00:59 PM
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### Citation

Matthieu Le Lay. MODELISATION HYDROLOGIQUE DANS UN CONTEXTE DE VARIABILITE HYDRO-CLIMATIQUE. Une approche comparative pour l'étude du cycle hydrologique à méso-échelle au Bénin.. Hydrologie. Institut National Polytechnique de Grenoble - INPG, 2006. Français. ⟨tel-00116912⟩

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