Simulation of dam-break flood and risk assessment: a case study of Chengbi River Dam in Baise, China

Abstract When a reservoir is damaged, it will bring destruction to people's lives and the regional economy. Flood simulation risk assessment are two effective ways mitigate flood risk. assessed by using hazard vulnerability indices. However, one of key concerns how quantify hazards vulnerabilities more rationally. To this end, study introduces new quantitative method for assessment. Three schemes – full dam breach (S1), 1/2 (S2), 1/3 (S3) were proposed simulation. HEC-RAS 2D was used simulate evolution process dam-break floods. This quantification approach calculate based on results. The results show following: (1) inundation similar under three schemes, but degree differs. greater break, depth, maximum flow velocity, duration. (2) High-risk areas decrease with decreased break degree. Under Longjing Street account 65.37, 71.41, 66.22% total areas, respectively, which most affected