Abstract
Affected by global climate change, the frequency of extreme weather events increases in China, and the suddenness, harmfulness and unpredictability of the flood disaster exceeding the designed level are more serious. As a result, emergency response problems facing cascade reservoirs are increasingly prominent, among which the dam break or consecutive break is the greatest threat to cascade reservoirs. In case of floods exceeding the designed level, cooperative emergency regulation of cascade reservoirs is an effective method to develop the comprehensive benefit of reservoirs. In this paper, the criterion of minimizing the highest water level is chosen as the objective function of the cooperative emergency regulation model in cope with floods exceeding the designed level, with the progressive optimality algorithm adopted to solve the function. Moreover, the related emergency regulation plan is conductively explored. In addition, the Pubugou Reservoir, Shenxigou Reservoir, and Zhentouba I Reservoir on the Dadu River are taken as examples to regulate and calculate the flooding process, which verifies the validity and reliability of the preceding model. According to the results, by means of cooperative emergency regulation of cascade reservoirs, each reservoir pre-discharges water in the early flood to maximize the storage capacity, thus coping with the possibly coming flood, minimizing the water level of each reservoir, and effectively ensuring flood control safety for cascade reservoirs. The research results are of great theoretical significance and engineering practice value for establishing the emergency regulation mechanism to cope with floods exceeding the designed level for cascade reservoirs in each river basin. CLC number: TV321 Document code: A
Highlights
As hydropower development is continuously advanced, cascade reservoirs are gradually formed in multiple large river basins
The criterion of minimizing the highest water level is chosen as the objective function of the cooperative emergency regulation model in cope with floods exceeding the designed level, with the progressive optimality algorithm adopted to solve the function for cascade reservoirs, effectively mitigating the flood control pressure of cascade reservoirs, improving the overall flood control capacity in the lower reach of the Dadu River, and securing the safety and stability of cascade reservoirs in the lower reach of the Dadu River and the safety of the lives and property of people in the surrounding reaches
The research results are of great reference value for establishing the emergency regulation mechanism to cope with floods exceeding the designed level for cascade reservoirs in each river basin in China
Summary
As hydropower development is continuously advanced, cascade reservoirs are gradually formed in multiple large river basins. In terms of an unexpected vital event of cascade reservoirs, considering emergency response only to single reservoirs and dams is very likely to cause chain disaster reaction to cascade reservoirs. The safety guarantee of cascade reservoirs confronted with emergent events has become hot and difficult issues with common concern in the national social and economic development, in particular, the safety problem caused by unexpected flood disasters due to floods exceeding the designed level.
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