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Modélisation de l'infiltration dans les sols fins compactés : intégration des écoulements préférentiels dans les macropores

Abstract : In order to investigate the integration of preferential flow through macropores observed in compacted fine-textured soils, 3 different modeling approaches are developed. The first considers a homogeneous medium whose hydraulic properties are described by the Van Genuchten & Mualem' s formulation. The second is based on the double-porosity concept where the soil matrix and the macropores are treated as two different flow-domains presenting different hydraulic parameters and an exchange equation takes into account the interaction mechanism. The third assumes that the pore-size distribution and consequently, the water retention and hydraulic conductivity curves follow bimodal laws also described by Van Genuchten & Mualem's formulation. For each one of these approaches, a direct model simulating the vertical infiltration and an inverse procedure for parameter estimation are presented. The simulations of laboratory infiltration tests are confronted with the experimental data. This reveals that the double-porosity concept, while providing a more realistic description of the infiltration process in macroporous soils, is limited in practice, since the two-domain parameters estimation is shown to be complex. The more pragmatic approaches based on the integration of macropores effect in the soil hydraulic properties through unimodal and bimodal functions are shown to be more interesting. The parameter estimates obtained for these 2 approaches suggest that the pore-size distribution of compacted fine-textured soils varies between unimodal and bimodal laws depending on initial water-content and compaction procedure.
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https://hal.univ-lorraine.fr/tel-01749895
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Adel Abdallah. Modélisation de l'infiltration dans les sols fins compactés : intégration des écoulements préférentiels dans les macropores. Autre. Institut National Polytechnique de Lorraine, 1999. Français. ⟨NNT : 1999INPL097N⟩. ⟨tel-01749895⟩

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