基于SWMM和LISFLOOD-FP的城市内涝耦合模型研究

Research on Urban Waterlogging Coupling Model Based on SWMM and LISFLOOD-FP

以柳州市箭盘山流域为例,构建SWMM一维管道模型与LISFLOOD-FP二维地面模型并将其耦合,基于实测降雨“20180818”24 h暴雨资料,将得到的暴雨内涝淹没水深和淹没面积与该场次降雨情况下记录淹没点的范围相比较,验证耦合模型具有较好的适用性。进而基于耦合模型,对柳州市箭盘山流域2、5、10、20年一遇下设计降雨进行模拟,得到不同重现期下研究区的溢流节点、淹没水深和淹没面积,并于ARCGIS平台将结果可视化。结果表明,重现期由2年上升到20年过程中,溢流节点比例从9.03%增加至25.99%,溢流面积从0.473 km^(2)增加至2.114 km^(2);重点淹没区域分布在屏山大道、炮团路、西江路和东堤路。

Taking the Jianpanshan watershed of Liuzhou City as an example,the SWMM one-dimensional pipeline model and the LISFLOOD-FP two-dimensional ground model were constructed and coupled.Based on the measured rainfall"20180818"24-hour rainstorm data,the obtained rainstorm waterlogging depth and inundation area were compared with the range of the recorded inundation points in the field,and the applicability of the coupling model was verified.Then,based on the coupled model,the design rainfall of 2,5,10 and 20 years in the Jianpanshan watershed was simulated,and the overflow nodes,inundation depth and inundation area of the study area under different return periods were obtained.The results were visualized based on the ARCGIS platform.The results show that the proportion of overflow nodes increases from 9.03% to 25.99%,and the overflow area increases from 0.473 km^(2)to 2.114 km^(2)when the return period increases from 2 to 20 years.The key inundation areas are distributed in Pingshan Avenue,Paotuan Road,Xijiang Road and Dongdi Road.