Abstract:

Dynamic control of the limit water level is one of effective strategy to utilize floodwater resources,which key problem is to work out a feasible over storage operation scheme based on rational weighing the contradictory of risk and interest.For more benefits and lower risk,precipitation forecast information was taken into account in this paper,and a method of 〖JP2〗grading of flood control level for floodwater〖JP〗 resource utilization was put forward based on predischarge capability constraint method.Then,the method was applied to Ankang reservoir for flood water resource utilization,the grading control water level was 326 m and 328 m respectively by calculation when the 24hourforecast rain intensity was 0.1 mm to 10 mm and 0.1 mm below.Furthermore,risk analysis indicates that the flood control level could not be over 327.5 m in the case of without regard to precipitation forecast information,but the risk could be ignored if 24hourforecast precipitation was taken into account.Finally,the scheme was applied to Ankang reservoir for a real flood operation,the benefit analysis indicates that it will bring about 361 thousands RMB of extra power generation interests at the same time cutting abandoned water 69 million m3.Therefore, it is proved that the application of the method has favorable effects not only on risk control but also on benefits increment in floodwater utilization.

Key words: reservoir operation/ floodwater resources utilization/ grading of flood , control level/ risk analysis