Research On Pump Station Dispatching And Lake Control Application After Expansion Of Fankou Pumping Station

Floods caused by heavy rains are long-term and serious problems facing Hubei Province.In 2016,the Yangtze River Basin suffered from torrential rains.Hubei Province became one of the most affected provinces.As the eighth largest freshwater lake in Hubei Province and the flood-prone area,Liangzi Lake was forced to break through floods during the devastating floods in 2016,causing great economic losses.In order to alleviate the flood control pressure of the Liangzi Lake Basin and improve the drainage standards of the Liangzi Lake Basin,the Liangzi Lake Station has built a new Fankou Station on the basis of the Fankou Pumping Station.After the completion of the Fankou Second Station,the flood control benefits and risks in the Lake District will change accordingly.Therefore,it is necessary to restore the historical inflow runoff process of the Lake District and carry out the analysis of the flood control calculation in the Lake District.This paper uses the Xinanjiang model to derive the design flood process of the Liangzi Lake watershed,and combines the Copula function to analyze the flood encounters between the Liangzi Lake and the Yangtze River,and builds a System Dynamics model of the Liangzi Lake based on water balance,designs the pumping station scheduling scheme with different starting water levels and different lifting arrangements,simulates the water level change process of the Liangzi Lake basin under the scenario of the previous flood unreturned,and provides calculation and analysis basis for the flood control and flood control scheduling of Liangzi Lake.The main results of this paper are as follows:(1)Select the rainfall,evaporation and runoff data of Liangzi Lake,and screen a total of 7 flood processes to simulate the runoff of Xinanjiang model.The simulation effect is good and can be used for forecasting operations.Comprehensive analysis of historical longterm precipitation data in Liangzi Lake Basin,to obtain the design rainfall of each lake under dofferent design frequency,the measured rainstorm process in 1999 was selected as the basin design rain pattern,and the design flood of each lake in the Liangzi Lake watershed was calculated.(2)The research shows that there is a strong correlation between the water level of Liangzi Lake and the water level of Fankou Gate;the two-station edge distribution model is established respectively,and Gumbel Copula is selected as the optimal Copula function;combined with the edge distribution and the optimal Copula function,two stations are obtained.The probability distribution of encounters shows that when the high water level occurs in Liangzi Lake,the high probability of another station will occur.(3)The System Dynamics model of the Liangzi Lake water balance is constructed,and the flood seasons of the Liangzi Lake are simulated by a total of five flood processes.The results show that the System Dynamics method has good dynamic simulation ability when applied to the Liangzi Lake watershed.The current water balance system dynamics model is applied to review the current scheduling scheme,and the calculation results are basically consistent.The scheduling scheme of the Liangzi Lake watershed in Liangzi Lake with different starting water level and different lifting arrangements of Fankou gate.The results show when the water level of the lake is raised to 18.06 m,the flood control safety can still be guaranteed.The impact of the previous flood on the flood control of the Liangzi Lake Basin is analyzed.The optimal lifting process is obtained considering the factors such as reducing the flood control risk and reducing the pump station load.