Simulation Evaluation Of Urban Drainage Pipe Network And Optimization Of Runoff Control Scheme

With the progress of urbanization in my country,the proportion of impervious materials such as asphalt and concrete in the underlying surface of the city continues to increase,affecting the hydrological conditions of urban watersheds and significantly increasing the frequency of urban waterlogging disasters.With the development of remote sensing technology and computer performance,the use of GIS combined with urban rain and flood models to simulate and evaluate urban drainage networks,and to plan and design sponge city construction based on the evaluation results has become an effective means to solve urban waterlogging.In this study,the main urban area of a city in southwestern my country was selected as the study area.By establishing a hydrodynamic water quality model of the drainage network in the study area,the rainfall scenarios of different rainfall return periods were selected for simulation,and the overload risk and overloading of the drainage network in the study area were comprehensively evaluated.Pollution risk of discharge outlet.According to the evaluation results,the optimal sponge facility technology and technology in the study area are screened,the optimal construction area of each sponge facility technology and technology is determined,and the sponge city planning plan in the study area is optimized.Aiming at the problems of many basic data errors and missing topological relationships of some pipe sections at the stage of urban storm flood model establishment,this research proposes a method for data correction and topological relationship extension of urban drainage network based on the DFS algorithm,which can correct abnormalities in the drainage network database.Reasonable correction of wrong data and reasonable extension of pipe sections with missing topological relationships will eventually form a reasonable,complete and unobstructed urban drainage network system,which provides accurate and reliable basic data support for the establishment of the model.Aiming at the problems of low utilization efficiency of massive data generated by urban storm flood model simulation and evaluation results that cannot fully reflect the actual situation of the region,this study proposes an AHP-based drainage network overload risk analysis method and a discharge outlet based on an improved fuzzy comprehensive evaluation method.The pollution risk analysis method can make full use of the massive data generated by the SWMM model simulation to analyze and evaluate the overload risk of the drainage pipe network in the study area and the discharge risk of pollutants at the discharge outlet.Aiming at the problems of single control target of sponge city planning and construction and excessive subjectivity of facility selection,this research proposes a sponge facility technology process screening method based on entropy weightTOPSIS and a sponge city optimization planning scheme screening method based on NSGA-Ⅱ algorithm.According to the actual situation of the study area,the most suitable sponge facility technology and technology are screened out,and the sponge city planning plan of the study area is optimized,and the optimal construction area of each sponge facility technology and technology is determined.The research of this subject is important for the rapid and accurate establishment of urban rain and flood models,comprehensive and actual assessment of urban drainage network overload risks and discharge pollution risks,scientific and efficient planning of sponge city construction,reducing overall construction costs,and reducing the frequency of urban waterlogging disasters.significance.