Abstract
Dam-break flooding is a potential hazard for reservoirs that poses a considerable threat to human lives and property in downstream areas. Assessing the dam-break flood risk of the Zipingpu Reservoir in Chengdu, Sichuan Province, China, is critically important because this reservoir is located on the Longmen Shan fault, which experiences high seismic activity. In this paper, we develop an approach based on the protected object for dam-break flood risk management. First, we perform a numerical simulation of dam-break flooding in four possible dam break scenarios. Next, the flood areas are divided into 71 analysis units based on the administrative division. Based on the numerical simulation results and the socio-economic demographic data affected by a flood, the importance and risk level of each analysis unit is confirmed, and the flood risk map is established according to the classification results. Finally, multi-level flood risk management countermeasures are proposed according to the results of the unit classification shown in the map.
Highlights
The Zipingpu Reservoir is situated in the upper reach of the Minjiang River in Sichuan Province, China, approximately 60 km east of Chengdu, the capital of Sichuan Province
Existing research on flood risk management mainly focuses on the mechanism and evolution of dam-break floods [5,6], assessments of direct and indirect losses of life and property in downstream areas affected by a flood [7,8], and the establishment of risk and emergency management measures [9,10]
This paper proposes a flood risk management method based on an administrative unit combined with the classification of flood hazards and unit importance
Summary
The Zipingpu Reservoir is situated in the upper reach of the Minjiang River in Sichuan Province, China, approximately 60 km east of Chengdu, the capital of Sichuan Province. Existing research on flood risk management mainly focuses on the mechanism and evolution of dam-break floods [5,6], assessments of direct and indirect losses of life and property in downstream areas affected by a flood [7,8], and the establishment of risk and emergency management measures [9,10]. The risk of a flood disaster is the result of the comprehensive effect of the flood hazard and the environmental vulnerability [20] This paper generalizes these two properties into the flood hazard and unit importance. Formulate countermeasures for flood control management in the downstream areas of the reservoir, considering the flood risk of the dam break according to the different hazards and importance levels
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