基于SWMM的南昌青山湖片区内涝积水模拟

Simulation of rainstorm water logging in Qingshan Lake area of Nanchang City Based on SWMM

对江西省南昌市青山湖区的排水管网、道路和河道水系等进行了概化,采用SWMM软件对重现期为1,2,5,10 a一遇和50 a一遇的暴雨排水情形进行了模拟,得到了积水深度、积水面积和积水时间等因素,在衡量内涝积水严重程度时需综合考虑。结果表明,排水管网淹没出流时的顶托作用是导致内涝积水的重要原因。对于该区域,城市排水管网半淹没出流和自由出流对排水能力影响不大,但淹没出流导致管网排水能力急剧下降。

The drainage network, road and river system of Qingshan Lake District of Nanchang City, Jiangxi Province, were generalized by using SWMM software to simulate the drainage with rainstorm recurrence periods of 1, 2, 5, 10, 50 a. The severi- ty of the water logging can be determined by ＂considering the water logging depth, area and duration. The result shows that the backwater effect of submerged discharge of pipe network is an important cause for water logging. For the study area, the drainage is less influenced by half- submerged discharge and free discharge. However, the submerged discharge can cause the sharp de- cline of the drainage capacity of the network.