黄浦区北部子汇水区划分方法及暴雨内涝情景模拟

近年来,城市地区面临的内涝灾害风险与日俱增。为研究暴雨引发的内涝灾害,以上海市黄浦区北部为研究区,分别使用人工划分法和泰森多边形划分法建立管网模型,并利用InfoWorks ICM模型对不同重现期情景下研究区的淹没情景进行模拟。结果表明,利用泰森多边形划分法构建的城市雨洪模型更适用于研究区的暴雨内涝情景模拟;最大淹没面积和最大积水深度均随着重现期的增大呈现增加趋势,在降雨重现期为5、10、20、50、100年时最大淹没面积分别为1.15、1.63、1.87、2.02、2.06km^2,内涝灾害明显加剧。研究结果可用于指导城市内涝灾害防治。

Sub-catchment Division Method and Rainstorm Waterlogging Scenario Modeling in North Huangpu District

In recent years, the risk of rainstorm waterlogging in urban areas is increasing. In view of urban waterlogging caused by rainstorm, the northern area of Huangpu district of Shanghai has been selected as the study area. The artificial division method and the Thyssen polygon division method were used to establish the urban pluvial flood model based on InfoWorks ICM. And then the rainstorm waterlogging in the study area was simulated under multiple scenarios of rainfall return periods (5 a,10 a, 20 a, 50 a and 100 a). The results show that the Thyssen polygon division method is more suitable for simulating the rainstorm waterlogging risk in the study area. Under different rainfall return periods, the maximum waterlogging area corresponding to 5 different rainfall intensities were 1.15,1.63, 1.87,2.02 and 2.06 km^2,respectively, indicating that the effects of waterlogging were significantly intensified. The results of this study are valuable for the prevention of urban waterlogging disaster.