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GRADING DYNAMIC CONTROL ON RESERVOIR WATER LEVEL IN FLOOD SEASON AND ITS APPLICATION ON ANKANG RESERVOIR

LIU Zhao1,HUANG Qiang2,YUAN Wen-lin2,QIAO Chang-lu1(1.Research Institute of Water and Development of Chang'an University,Xi'an 710064,China;2.Key Lab of Northwest Water Resources and Environment Ecology of the Ministry of Education at Xi'an University of Technology,Xi'an 710048,China)  
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 grading of flood control level for floodwater 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 m3.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.
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