De la performance des évacuateurs de crues dans les études de dangers à la probabilité d’occurrence d’une rupture de barrage en crue

Abstract : French regulation for dams safety defines dam classes and related requirements. Among those requirements, safety reports are mandatory for dams of classes A and B. A safety report is the evaluation of the risk level (in probability and severity) that the structure poses on its environnement at a given time. INERIS has adapted existing methodologies about safety systems evaluation. The aim is to use spillways performance in order to assess the semi-quantitative probability of dam break due to a flood in safety reports. This work is based on the state of the art regarding flood predetermination and spillways conception and management. Differents types of spillways have been evaluated according to the requirements in use for the safety barrier : response time, sizing, efficiency, confidence level and maintenance over time. The confidence level permits to assign a probability of failure on demand class to a safety barrier through a technical and qualitative evaluation. As the spillways failures are considered as root events in a bow-time diagram, the confidence level has been translated in annual frequency. Those different datas are used to calculate a probability of dam break due to a flood.
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François Masse, Anabel Lahoz, Thibault Balouin. De la performance des évacuateurs de crues dans les études de dangers à la probabilité d’occurrence d’une rupture de barrage en crue. Colloque CFBR "Vantellerie, contrôle-commande, télécom et alimentations électriques pour des barrages plus sûrs", Dec 2015, Chambéry, France. ⟨ineris-01855185⟩

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