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Projet RIVES : Risques d'inondation en ville et évaluation de scénarios. Rapport scientifique final

Abstract : RIVES (urban flood risk and scenario assessment) project focuses on some specific processes occurring during urban floods and investigates how to assess the consequences linked to various hydrological scenarios. In order to investigate flows at crossings, a device using four channels was set at LMFA (Laboratory of Fluid Mechanics and Acoustics in Lyon). Some experimental runs were carried out in order to simulate blockage of cars near the crossings. Dams formed in such a way create a rise of water levels that can double the water depth. In Clermont Ferrand (at LRPC, Regional Laboratory of Bridges and Roads), an urban district constituted by 64 blocks was modelled at a horizontal scale of 1:100 to investigate the impact of urban works on flow features. Three cases of real towns were studied: for Nîmes and Marseille, historic events of very intense rainfalls are modelled while in Oullins (along Yzeron River, near Lyon), measurements (discharges and water levels) were carried out to understand sewage network operation and to follow overflow along river banks. In the latter case, only one flood (November 2008) could be observed. To assess the uncertainty of results due to the input parameters, a mathematical model for the propagation of sensitivity to input parameters was developed. Moreover, the project showed that models such as a 2-D porosity model or a coupled model between sewage network and surface propagation or a rainfall simulator are useful for some specific situations. These innovative models as well as the methods developed to treat real cases permit to offer new tools including uncertainty assessment to urban flood managers.
Mots-clés : RIVES
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https://hal.inrae.fr/hal-02592263
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Submitted on : Friday, May 15, 2020 - 4:02:18 PM
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  • IRSTEA : PUB00027111

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André Paquier. Projet RIVES : Risques d'inondation en ville et évaluation de scénarios. Rapport scientifique final. [Rapport de recherche] irstea. 2009, pp.145. ⟨hal-02592263⟩

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