Author(s)

N. Gendreau & P. Farissier

Abstract

Landslide risk: 2D modelling of hydraulic consequences N. Gendreau, P. Farissier Cemagref, Division Hydrologie-Hydraulique, 3bis, Quai , Cf 220, 6PJJ^Z,yoM CWex OP, 1. Presentation A landslide may happen in the French Alps. A very huge mass of materials may fall (100 hm^ maximum) and would fill a part of the valley, where a river flows. A natural dam may be created. A reservoir may appear upstream (backwater phenomenon). The existing of a tunnel may mitigate its volume, or even remove it. Over a certain water depth in the reservoir and constraints, the natural dam may fail (breaking up phenomenon) and the water may then flow downstream in the river valley. A strong rainfall event may be one of the possible cause of the landslide and a flood may probably be concomitant with it. Moreover, several successive material falls may happen and generate a water wave. It would have impacts upstream to a village and a housing estate. A global analysis, involving socio-economic, hist

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