Simulation study of urban multistage drainage system modification based on SWMM and FVCOM model
[Objective]The use of numerical modeling to carry out drainage performance analysis of multistage drainage systems at different scales in urban areas is important for improving the operational efficiency of drainage systems and reducing the risk of ur-ban flooding.[Methods]Taking the ancient city planning area of Xiaoyi City,Shanxi Province,as the study area,through the research and analysis of the historical flooding point and the current drainage system,a multilevel drainage system renovation scheme based on"pipe-culvert-river"is proposed,and the open-source models SWMM and FVCOM are used to carry out the coupled one-and two-dimensional hydrological and hydrodynamic modeling,and the simulation and comparison of the pipeline network and flooding waterlogging situation in the study area are carried out before and after the renovation.The simulation com-pares the pipe network overflow and waterlogging in the study area before and after the retrofit,and the extreme working condition with guest water intrusion is calculated and analyzed.[Results]The result show that:under the status quo scenario,even if the rainfall return period is one in 3 a or 5 a,the ancient city planning area will have more serious pipe network overflow;in con-trast,after the retrofit,under the rainfall scenario of one in 30 a,the number of pipe network overflow nodes is reduced by 28％,the maximum depth of waterlogging is reduced by 0.44 m compared with the pre-retrofit scenario,and the scope of waterlogging inundation is significantly reduced.The box culvert and moat were in good operating condition,with peak flows below the maxi-mum allowable flow,and neither the Loudong Park flood storage pool nor the Chengdong flood storage pool exceeded the upper limit of water level and volume.There was no significant increase in water accumulation in the core area of the Old City under the passenger water condition.[Conclusion]The coupled model based on SWMM and FVCOM is well applied in the modeling and e-valuation of urban multilevel drainage systems,and the"pipe-culvert-river"engineering modification is an effective means to improve the ability of cities to cope with the disaster of heavy rainfall and flooding.
urban floodingnumerical simulationmultistage drainage systemSWMM modelFVCOM model
万方数据
维普
