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Modélisation à base physique des processus de l'érosion hydrique à l'échelle de la parcelle

Abstract : This study comes within the development of physically based models of water erosion at the field scale. The objective is to build a numerical model (PSEM_2D, Plot Soil Erosion Model) coupling the mechanisms of infiltration, overland flow and erosion. The selected parameterizations are first implemented in the model. A preliminary evaluation using data of the literature gives acceptable results and highlights the usefulness of such a tool for studying the transfer of water and sediment. The study then focuses on the processes of rill erosion. Data from an American database on particle-size distribution of exported sediment, hydraulics and erosion regimes in rills are analysed. The results reveal that different behaviours may be distinguished depending on the soil texture. A comparison between the observed data and the results of PSEM_2D is carried out. The transport capacity formulae of Low (1989) and Govers (1992) give the best results. The detachment model allows reproducing the erosion regimes but reaches its limits when deep rills are forming. An experimental study in a 3 m long flume is undertaken to improve the parameterization of the transport of particles. Suspension and bed load transport are distinguished based on the size and density of the particles. Finally, PSEM_2D is used for a case study on water erosion. 192 simulations are run over a 100 m² plot for different conditions of rain, run-on, topography and soil properties. The results are examined at the outlet of the plot and within the plot divided in 5 zones along the slope length.
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https://tel.archives-ouvertes.fr/tel-00111955
Contributor : Guillaume Nord <>
Submitted on : Tuesday, November 28, 2006 - 4:18:17 PM
Last modification on : Thursday, November 19, 2020 - 3:54:28 PM
Long-term archiving on: : Monday, September 20, 2010 - 4:50:21 PM

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  • HAL Id : tel-00111955, version 2

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Guillaume Nord. Modélisation à base physique des processus de l'érosion hydrique à l'échelle de la parcelle. Hydrologie. Université Joseph-Fourier - Grenoble I, 2006. Français. ⟨tel-00111955v2⟩

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