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Estimation des paramètres hydrodynamiques des sols à partir d'une modélisation inverse de données d'infiltration et de résistivité électrique.

Abstract : ESTIMATION OF SOIL UNSATURATED HYDRAULIC PARAMETERS FROM A JOINT INVERSION OF INFILTRATION DATA AND ELECTRICAL RESISTIVITY DATA This thesis work aims to establish an inverse method for estimating soil hydraulic properties using infiltration data (during a disc infiltromètre experiment) and electrical resistivity data obtained in the wetting bulb zone. After introducing the method and suggesting its the relevance, we realized a numeric study (synthetic data) for demonstrating the capability of the method to get a correct estimation of the hydraulic parameters (parameters of the Mualem-van Genuchten). Therefore maps of the objective function have been realized, and inversion scenarios have been tested. Three hydraulic parameters et two petrophysical parameters which allow to convert by the Rhoades's law (1976) the soil electrical resistivity to the volumetric water content. The numerical study showed that the method is well suited for estimating the hydraulic parameters but not for the petrophysical parameters. The last chapter deals will real experiments and their associated numerical inversions. For the 3 soil textures tested, 4 inverse scenarios were realized. In comparison with other methods, we concluded, that, for the loamy soil case, the method has led to the correct estimations of the hydraulic parameters, but estimations on the Rhoades parameters is incorrect. The dispersivity is estimated with a large uncertainty. For the sandy soil estimations the hydraulic parameters and of the dispersivity are less accurate than for the loamy case. For the clay soil, hydraulic parameters are also estimated with a large uncertainty. The method, at this stage of development, seems to be more adapted for soils with medium texture.
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Sébastien Schneider. Estimation des paramètres hydrodynamiques des sols à partir d'une modélisation inverse de données d'infiltration et de résistivité électrique.. Planète et Univers [physics]. Université Paris Sud - Paris XI, 2008. Français. ⟨tel-00459291⟩

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