Study on dynamic control scheme of water level of Danjiangkou Reservoir during flood season
DUAN Weixin;GUO Shenglian;ZHANG Jun;XING Wenhui;BA Huanhuan;State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University;Bureau of Hydrology,Changjiang Water Resources Commission;
After the dam heightening project of Danjiangkou Reservoir,in order to ensure the midstream and downstream flood control safety of the Hanjiang River and water supply of the South-to-North Water Diversion Project,the conflict between flood control and water supply become more prominent. According to the current impounding scheme,the full storage ratio may be further reduced. In this paper,the operation mode and pre-release capacity of Danjiangkou Reservoir are simulated and analyzed based on the actual flood data. Then according to the flood characteristics of the Hanjiang River basin,the dynamic control schemes for the operating water levels of Danjiangkou Reservoir in different periods are proposed. The results show that the proposed operation scheme can further increase the flood control benefit and ensure the flood risk control ability under the conditions of guaranteeing the normal operation of reservoir. The proposed operation scheme can increase the water supply assurance rate by about 10% and the power generation benefit by about 5%.