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Habilitation à diriger des recherches

Streamwise non-uniform overbank flows in compound channels

Abstract : My research works focus on the physical and numerical modeling of river floods, in the case of streamwise non-uniform overbank flows in compound open channels. These flows are characterized by longitudinal changes in flow depth and by a lateral time-averaged discharge between the main channel of the river and the adjacent floodplains. The longitudinal non-uniformity of flow is mostly caused by the changes in topography and land occupation of floodplains. Non-uniformity can also be related to the influence of the boundary conditions associated with the reach under consideration. These various sources of non-uniformity have been investigated throughout this work. The physical processes induced by flow non-uniformity have been studied in laboratory flumes. The analysis is carried out at the reach scale, but also at a smaller scale, with a three dimensional description of the mean flow and turbulent quantities, especially in the mixing layer developing at the junction between the main channel and the floodplains. The numerical modeling work is focused on the approaches 1D, 2D and 1D+ (development of a new method). In particular, we assess their ability to take into account the physical processes that are specific to non-uniforms flows, and eventually, to predict the flow depth and velocity in the floodplains. This is done for small overbank flows, but also for very high flows associated with extreme flood events.
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Habilitation à diriger des recherches
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  • HAL Id : tel-02606007, version 1
  • IRSTEA : PUB00054138

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Sébastien Proust. Streamwise non-uniform overbank flows in compound channels. Environmental Sciences. Habilitation à Diriger des Recherches, Université Lyon I, 2015. ⟨tel-02606007⟩

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