Research And Application On Flood Storage Optimal Allocation Model Of Flood Control Regulation For Multi-Reservoir

Flood disaster is one of the most severe natural disasters in our country.As the main body,the flood control project built on many rivers has begun to take shape initially with.However,due to such limitations as the reservoir design of flood control capacity of,the operation mode of flood control,space geography and their own restrictions,it's difficult to fight against big floods merely by the use of a single reservoir flood control.With the development of the combined dispatching technology of reservoirs,it has become an effective mean to achieve the safety of the flood control in various rivers.In the flood season,it's effective to improve the flood control security of the common protected area downstream by making full use of the spatial compensation of the reservoir group to stop the flood.Therefore,it is the key technical problems in the flood control operation to seek the reasonable optimized allocation method of the flood control capacity for the reservoir group and give full play to the synergistic effect among the reservoirs.The thesis mainly pays much attention to the optimal allocation of the flood control capacity for reservoir group,and take the upstream reservoir group of the Yangtze River as an example.The main study and innovation can be illustrated as follows:First of all,in order to solve the imbalanced problems of reservoir capacity in the process of reservoir flood control,the thesis provides the synchronous scheduling strategy for water storage,build the mode of the optimal allocation model of flood control capacity as well as uses the linear programming to solve it,taking the upper reservoir group of the Yangtze River as the research study.As the calculation results show that the simultaneous impoundment strategy can manage the reservoir group as a whole and make the risk of flood protection in each reservoir be consistent with the conventional strategy,compared to the conventional excessive standard of the flood strategy.Secondly,for the linear security,the serious problems can be caused by the high utilization rate of a single reservoir.Then the nonlinear function relation between the security degree and the capacity utilization are put forward,and the optimal allocation model of flood control reservoir capacity is constructed on the basis of the nonlinear safety to the largest degree.Meanwhile,by POA,the falling rate of the safety degree can vary the capacity rate.The results show that the strategy can give consideration to the safety of reservoir group and single reservoir.Thirdly,in order to solve the problem that the traditional aggregation-decomposition model cannot allocate the inflow between the upstream and downstream reservoirs on the same tributary,the synchronous water storage rules for the series reservoirs are added,and the nonlinear safety objectives are involved,and the optimal allocation of flood control reservoir capacity of the mixed reservoir is constructed.The model is used to optimize the parameters of the aggregate reservoir,and then the decomposition flow of the reservoir is obtained by decomposing the sub-model.The results of show that the improve model of the compound reservoir can effectively reduce the excessive floods of the flood control station under the premise of keeping the reservoir safe.Last but not the least,the reservoir flood control system is designed,which is integrated by the mentioned three modes,and this system can get the results quickly.What's more,the user can provide timely information for the decision maker,so as to implement the system in the upper reaches of the Yangtze River reservoir group and finally to provide technical support for the reservoir flood control in the upper reaches of the Yangtze River.