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Modélisation de l'évolution morphologique d'un lit alluvial : application à la Loire moyenne

Abstract : This work deals with the development of methods that sought to assess channel changes of a long anthropogenised river over several decades. These methods are applied on the Middle Loire River (France). Channel changes are evaluated by dividing the study reach into geomorphically distinct river reaches. A narrowing of the active channel width and a decrease of the river bed slope were observed between 1955 and 1996. Since in stream gravel mining stopped (1996), river adjustments have continued at a slower rate. Simplified geometry and simplified hydrographs are then derived and introduced into a one dimensional sediment transport model (RubarBE). The simplified geometry allows pertinent calculation of the river bed evolution whilst reducing calculation time. The use of simplified hydrographs highlights the sensitivity of sediment transport modelling to hydrology. Finally, the application of the simplifications to the whole Loire Moyenne River confirms the general trend observed between 1996 and 2006.
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  • HAL Id : tel-02596115, version 1
  • IRSTEA : PUB00033805

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A. Latapie. Modélisation de l'évolution morphologique d'un lit alluvial : application à la Loire moyenne. Sciences de l'environnement. Doctorat en Sciences de la Terre et de l'Environnement, Université de Tours, 2011. Français. ⟨tel-02596115⟩

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