Approches de modélisation pour la partition ruissellement-infiltration à différentes échelles spatiales et temporelles : cas de la parcelle de Thies (Sénégal) et du bassin versant de Houay Pano (Laos)

Abstract : This work deals with distributed modeling of runoff-infiltration processes in a natural environment. The response of complex natural systems is studied from local measurements, numerical investigations and distributed models. Experiments held in Thies, Senegal, on a 40m2 plot show that the heterogeneity of the surface put in the wrong classical friction laws (Manning, Darcy-Weisbach) of runoff models, because they underestimate high velocities. Two laws, taking physically or empirically into account the submersion of rugosity, are tested. In the Houay Pano catchment, we highlight from simulated rainfall experiments on 1m2 plots the effects of heterogeneities, mainly due to soil crusting and vegetation, on the spatially integrated runoff. We observed that the mean infiltration rate is dependent of the rainfall intensity and studied the effects of a statistical distribution of infiltrabilities on permanent and non-permanent infiltration. The exponential distribution of infiltrabilities appeared to be the best suited distribution. It is used to analyze spatial and temporal variability of runoff production in the catchment under natural rainfall, in order to obtain a per land use characterization of infiltration. Eventually, this simple but accurate model at the meter scale is implemented as a base pixel into a runoff-infiltration model at the sub-catchment scale (0.5 ha)
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Jérémy Patin. Approches de modélisation pour la partition ruissellement-infiltration à différentes échelles spatiales et temporelles : cas de la parcelle de Thies (Sénégal) et du bassin versant de Houay Pano (Laos). Autre. Institut National Polytechnique de Lorraine, 2011. Français. ⟨NNT : 2011INPL033N⟩. ⟨tel-01751073⟩

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