Simulation Of Waterlogging In Urban River Drainage System And Study Of Optimal Control Model Of River Sluice And Pump

With the change of global climate and the increasingly intensified urbanization,a series of problems such as blockage of drainage system and river silting occur frequently,urban waterlogging and overflow pollution is becoming more and more serious,causing huge social and economic losses and affecting life and personal safety of people.The urban waterlogging disasters cannot be effectively alleviated due to the insufficiency of drainage pipe network information lag,unscientific waterlogging prevention and control of river,disunity of urban drainage and waterlogging drainage standards,and lack of information system platform.Therefore,the establishment of reliable and accurate urban drainage pipe network waterlogging model and the study of optimal regulation of river sluice and pump has important practical significance,has become a research hotspot in recent years.The wide application of urban stormwater management model and the study of hydraulic simulation of watercourse provide a new method and approach for urban waterlogging prevention and watercourse drainage.In the research,the calculation principle and modeling procedure of SWMM are introduced in detail,taking Liede River basin in Guangzhou as the study area based on SWMM model and GIS technology,the waterlogging model of urban drainage pipe network integrating drainage system and river channel is established and optimal operation model of river sluice and pump.In ArcGIS,Theissen polygon method was used to divide the sub-catchment area,and the hydrological and hydraulic elements in the study area were generalized by SWMM model,and the values of model parameters were calibrated and verified.Based on the analysis of the simulation results,the influence of the control of gate valve and drainage pump station on the drainage system and waterlogging level of the river under different rainfall scenarios is studied.The dynamic link library call program of SWMM model and MATLAB software was used to transmit model data and results,and the calculation process of multi-objective optimal scheduling model was imported to improve the calculation efficiency.In order to solve the problem of multi-objective optimization in river sluice gate and pump operation,the three optimization objectives are the minimum water accumulation time at waterlogging nodes,the maximum gate discharge and the minimum cost of pumping station,the hydraulic design conditions of drainage pipe,gate and storm water pumping station are set as constraints,and the gate opening and closing state and the operation flow of pump station are treated as optimal variables,urban runoff multi-objective optimization model of controlling the river sluice gate and pump is established based on the NSGA-? and multi-objective particle swarm optimization algorithm to optimize the current operation scheme of the city river sluice gate and pump,the model can solve the drainage problem of the city river basin,effectively control the flood level of the river surge,and reduces the occurrence of urban water accumulation,overflow at nodes and waterlogging.