Research On Application Of InfoWorks ICM Model In Drainage And Flood Control And Sponge Reconstruction

At present,there is a problem that the scheme and current situation do not match in the construction of drainage and waterlogging prevention and sponge city,which can not only guarantee the engineering effect,but also easily lead to investment waste.InfoWorks ICM can realize the integration of urban drainage system model and river channel model,and truly and effectively simulate the interaction between urban drainage system,river and rainfall.In this study,a new urban district in Hangzhou is taken as an example,and it is of great practical significance to use InfoWorks ICM to scientifically analyze the existing drainage system,find out the existing problems,and put forward feasible planning suggestions on this basis.This study takes a new urban area as the research object,and takes InfoWorks ICM model software as a tool,the drainage system model of was constructed,and the waterlogging risk and drainage system capacity of the area were evaluated by scenario simulation evaluation method.The results show that the total length of pipes and canals with drainage capacity less than 2-year return period is 18.94 km,accounting for 20.58%;the area of high waterlogging risk area(waterlogging depth > 0.5m)was 5.49 ha,accounting for 19.78%,among which the simulated waterlogging point and the actual collected waterlogging point were highly coincident,which also confirms the accuracy of the simulation from the side,and analyzes the causes of waterlogging with the model.According to the causes of waterlogging,the corresponding planning suggestions are put forward.In order to solve the waterlogging problem from the source,the source sponge transformation method is discussed in detail.According to the actual situation of study area,this paper puts forward three kinds of sponge facilities transformation schemes,establishes the optimization hierarchy of sponge facilities transformation of the three schemes with the help of analytic hierarchy process,and selects five influencing factors:cost,construction difficulty,runoff reduction effect,compliance with relevant planning,and environmental impact during construction.According to the scoring of eight professionals and the final model calculation,it can be concluded that the third case(the combination of biological detention facilities,green roof and permeable pavement)got the highest score.The results show that the scheme has the best control effect for short duration and long duration rainfall,and the annual total runoff control rate can fully reach the target value,which has a significant role in alleviating the waterlogging pressure in study area.This study can provide reference and technical support for similar drainage and waterlogging prevention and sponge reconstruction projects.