Study On The Application Of Info Works ICM Models In Waterlogging Drainage Planning Of Dongxihu District In Wuhan City

In recent years,with the sustainable development of urbanization in China,frequent waterlogging in cities has posed a major threat to the stable development of society and the safety of people’s lives and property.Excessive urban hardening area,unreasonable drainage planning,and backward drainage facilities are the root causes of urban waterlogging.Drainage planning is particularly important as the first step in designing a drainage system,but traditional drainage planning lacks scientific waterlogging simulation calculations.To solve the urban waterlogging problem,a precise,all-around,and scientific simulation of the urban drainage system is required,which is aimed to provide a powerful technical support for the planning,design,operation,management,and scheme optimization of urban drainage systems.This paper took waterlogging in the Dongxihu District of Wuhan as the research object,used Info Works ICM model software,and constructed a drainage system model to assess the risk of urban waterlogging.In the condition of P=30a long-duration rainfall,one-dimensional drainage pipe network model,two-dimensional surface flood model and coupling model of the two were established to assess the current waterlogging conditions in the Dongxihu District and analyze the causes of waterlogging points.The results show that:In the research region,area of the region with low risk of waterlogging is 5.58km~2,accounting for 67.55%;area of the region with medium risk of waterlogging is 1.92km~2,accounting for 23.24%;area of the region with high risk of waterlogging is 0.76km~2,accounting for 9.20%.Meanwhile,based on the short-duration rainfall of P=2a,P=3a,P=5a,a simulation analysis of the current drainage pipe network was carried out to evaluate the drainage capacity of the current drainage system.The results show that the length of the pipes and culverts whose drainage capacity P<2a is 94.35km,accounting for 30.34%;the length of the pipe and culverts whose drainage capacity 2a≤P<3a is 12.69km,accounting for 4.08%;the length of the pipe and culverts whose drainage capacity 3a≤P<5a is 15.37km,accounting for 4.94%;the length of the pipe and culverts whose drainage capacity P≥5a is 188.56km;accounting for 60.64%.Finally,it is concluded that the main causes of waterlogging are imperfect pipe network drainage systems,insufficient drainage capacity of some pipe networks,local low-lying terrain and insufficient pumping capacity of pumping stations.On the basis of in-depth evaluation and research on the current drainage system,the analytic hierarchy process technology was used to compare and analyse the three schemes for the expansion of pumping station.It was found out that the plan to expand the original Taertou Pumping Station and build a new pumping station in Jinyintan area is more reasonable and feasible.This paper also carried out the planning and transformation design of the current drainage pipe network,and used Info Works ICM model software to simulate the planned drainage pipe network.The results reveal that after planning and transformation of the drainage pipe network,the urban pavement basically has no water accumulation,and the high-risk waterlogging area is basically eliminated,which verifies the rationality and feasibility of the planning scheme.