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Analyse et modélisation des propriétés hydriques d'un horizon hétérogène de sol

Abstract : Our research aims at determining the effective hydraulic properties of a highly heterogeneous horizon in an Albeluvisol. We first measured the hydraulic properties of the two homogeneous sub-units (Elementary Pedological Volume, EPV) of the horizon by developing a new laboratory protocol dedicated to the measurement of the unsaturated hydraulic conductivity on small pluri-centimetric samples. We demonstrated that the hydraulic properties of the clayey ochre EPV and the silty white EPV were significantly different. Secondly, we characterized the 3-D organization of the heterogeneous horizon by the geophysical method of electrical resistivity. The signal was sensitive to the difference of texture between the two EPV and, as a consequence, the electrical structure derived from the field measurements showed an organization close to the structure of the horizon. Thirdly, we estimated the effective hydraulic properties of the horizon using the Scaleway approach. The effective hydraulic properties were determined from analytical calculations or numerical modelling on 2-D slices of the 3-D structure. The results showed a strong relationship between the hydraulic conductivity and the structure of the soil horizon. Thank to our results of modelling, we finally proposed a simple practical approach to obtain the effective hydraulic conductivity of heterogeneous horizons.
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  • HAL Id : tel-02821474, version 1
  • PRODINRA : 33227

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Anthony Frison. Analyse et modélisation des propriétés hydriques d'un horizon hétérogène de sol. Sciences de la Terre. Université d'Orléans, 2008. Français. ⟨tel-02821474⟩

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