Author(s): Hu Yue; Zhang Qianzhu; Yang Xingyu; Wu Haiqi
Linked Author(s):
Keywords: HEC-RAS; Dam Failure; Flood routing; Numerical simulation; Risk assessment
Abstract: Reservoir dam safety has a bearing on the effectiveness of reservoirs in flood control, power generation and irrigation, as well as the safety of people’s lives and property. Reservoir dam failure flood analysis can provide important technical support for reservoir flood control and rescue planning, risk management, disaster assessment and so on. In this paper, the HEC-RAS model was used to simulate the instantaneous dam failure flooding process under different scenarios, and to obtain important water information such as downstream inundation time, scope, and depth, etc, taking the Wanmipo Hydropower Station as an example. It was found that the fastest flows in the inundation zone channel and near the reservoir were of high risk, and that the effects of the different dam failure scenarios on the flood flow at each section were significantly different due to the differences in the incoming flow and initial downstream river level. Based on the differences in flood depth and flow rate, different hazard values were assigned to assess the risk of dam failure, taking into account the loss of life of the population, and it was found that the time for population transfer and resettlement should be within 6h, and the earlier the warning was given, the smaller the loss of life caused by dam failure would be, with 3h as the optimal warning time. This study provided data reference and technical support for downstream flood control decision-making, and also provided reference for other large and medium-sized reservoir project dam failure analysis.
Year: 2024