Simulation of urban rainstorm waterlogging processes based on SWMM and LISFLOOD-FP models:Case study in Jinan City
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Abstract:
The process of urbanization continue to intensify due to China′s rapid economic and social development,resulting in a series of urban water problems,such as the shortage of water resources,urban rainstorm waterlogging,water environmental pollution and water ecological damage.Urban waterlogging problem caused by short-term rainstorms is particularly significant,which causes great losses and has a wide range of impact,and has become the focus of social and scientific circles. Based on the advantages of the SWMM model and LISFLOOD-FP model,coupling one-dimensional pipe network and two-dimensional inundation model,calibration and verification was carried out using historical rainfall,flood flow extract data,and inundation data to analyze the distribution characteristics of overflow nodes,inundation depth and range under different rainstorm scenarios to provide some scientific and technological support for flood control and disaster reduction in Jinan City. Validation of coupling model showed good applicability in the study area;With the increase of precipitation return period,the number of flooding nodes and water depth range of inundation showed an increasing trend.The total inundation area increased from 8.18 km2 to 21.92 km2,and the inundation area with a water depth range of 0.1-1.0 m showed the largest proportion.The results can provide scientific and technological support for flood control and disaster reduction in the study area. The simulation results of the SWMM and LISFLOOD-FP coupling model show the location of waterlogging prone points in the strudy area.The submergence depth of most grids at the intersection of 2nd Ring West Road and Zhangzhuang Road is between 0.1 m and 1.0 m,and the maximum water depth monitored is 0.34 m,which indicates that the coupling model has good applicability.The model can be used to carry out relevant research work.With the increase of design precipitation return period,the overflow node and inundation range show a significant increasing trend.When the design precipitation return period increases from 1 year to 5 years,the overflow nodes increase the most,and the main streets are flooded to varying degrees.The 5-year return period design precipitation has caused serious waterlogging,which indicates that the drainage capacity of the study area lags.LISFLOOD-FP two-dimensional simulation results show that there is water accumulation in some low-lying areas such as rivers and lakes in the study area,which is different from the actual situation.The reason may be related to the accuracy of input DEM data.In this case,further fine processing of DEM data can better describe the actual surface flooding process.
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