Urban community stormwater inundation simulation research on coupling one-and two-dimensional hydrodynamic models
[Objective]Against the backdrop of global climate change and rapid urbanization,the risk of urban flash flood disas-ters is continuously increasing.Hydrological and hydraulic models are crucial tools for understanding the mechanisms behind flash floods.Constructing a scientifically reasonable flash flood model is currently a research hotspot.[Methods]By coupling a one-di-mensional pipe network hydraulic model(SWMM)and a two-dimensional hydraulic model(LISFLOOD-FP),a flash flood model at the urban community scale was established.A university community was selected as the study area,and multiple scenarios of measured precipitation and design storms were simulated for flash flood analysis.[Results]The result indicate that:(1)Using the measured precipitation on July 11,2023,as an example,the simulation result exhibit high consistency with the actual situa-tion,demonstrating that the accuracy of the coupled model meets the needs of flash flood simulation at the urban community scale.(2)Taking 1 a,5 a,10 a,20 a,50 a,and 100 a return period design storms as examples,with increasing rainfall,the load on the stormwater pipe network,inundation area,and depth significantly increase.The number of high-risk pipe network segments grows by 3.17 times,and the inundation area expands by 170％.The inundation area and depth are positively correla-ted with the return period.In the 20-year to 50-year return period range,the community's drainage capacity reaches saturation.(3)The simulation result show that the high-risk areas of flash floods in the study area are mainly distributed along the bounda-ries of the teaching area,the southern side of the residential area,and the junction area between the teaching and residential are-as,requiring attention from relevant authorities.[Conclusion]The research result demonstrate that the flash flood model,cou-pling SWMM and LISFLOOD-FP,exhibits high accuracy in simulating the status of stormwater pipe networks and surface water inundation.It is suitable for flash flood simulation and analysis at the urban community scale.
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