基于SWMM模型的南京典型易涝区暴雨内涝模拟

选取南京市易涝区—鼓楼区广州路段为研究区,构建基于SWMM的一维雨洪模型,利用南京市2011年"7·18"暴雨资料,模拟暴雨形成的内涝情况,拟合地表积水量与最大积水深度的函数关系,计算得到易涝区积水开始时间、积水持续时间、最大积水深度,并与南京市100年一遇设计暴雨形成的积水过程进行比较。结果表明:提出的快速推算最大积水深度的方法能够较高精度地实时动态计算研究区"7·18"暴雨形成的积水过程,及时有效支撑防洪除涝应急决策;相较于"7·18"暴雨,100年一遇设计暴雨形成的易涝区最大积水深度更深,积水持续时间更长。

Rainstorm and waterlogging simulation in typical inundated districts of Nanjing based on SWMM

As a frequently inundated region in Nanjing, Guangzhou Road and its surrounding area were selected as the study site in which a one-dimensional storm flood model was built based on SWMM. The inundation induced by the storm event occurred in July 18^th, 2011 was simulated using the measured rainstorm data. The function relationship between the total cumulative inundation volume and the maximum inundation depth was fitted, and the starting and lasting time of the inundation and the maximum inundation depth were calculated, which were compared to the inundation induced by the design storm with 100-year return period in Nanjing. The results reveal that the fast calculation method for the maximum inundation depth proposed in this paper can dynamically calculate the inundation induced by the storm in July 18^th with high simulation accuracy, which can timely and effectively support flood control and drainage emergency decision-making. Compared with the storm in July 18^th, the maximum inundation depth and the lasting time of inundation remarkably increase under the condition of the design storm with 100-year return period.