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Predicting the flow in the floodplains with evolving land occupations during extreme flood events

Abstract : The contributions of “human activities (such as increasing human settlements) and climate change to an increase in the likelihood and adverse impacts of flood events” are clearly stated in the European Flood Directive (EU, 2007). These changes must be taken into account when assessing the flood hazard, from events with a high probability (return period 10 1000-year. The first task will particularly focus on the effects of lateral and longitudinal roughness transitions, of the confinement degree and the spatial distribution of the roughness elements. The experiments will be carried out in five flumes, under uniform or non-uniform flow conditions, relying on the state-of-the-art measurements on both large and small scales (i.e. the river reach scale or the roughness elements scale). For the second task, the previous experimental database will be compared to simulations performed with industrial and research codes (1D to 3D modelling). The classical methods to model flow resistance with an increasing complexity will be assessed and improved to capture the physics for the entire span of studied flow rates. The codes and methods will then be applied to the floods at Besançon, France. Events with T~100, 1000 and 10000-year will be simulated with both classical and improved methods, and the discrepancies will be calculated. This project will permit to quantify uncertainties on water levels and velocities computed for extreme events.
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Submitted on : Saturday, May 16, 2020 - 4:41:02 AM
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  • HAL Id : hal-02600363, version 1
  • IRSTEA : PUB00042118

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Sébastien Proust. Predicting the flow in the floodplains with evolving land occupations during extreme flood events. France. 2014, pp.1. ⟨hal-02600363⟩

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