已建城市排水管网的排涝能力评估方法

以SWMM 模型为平台构建已建城市区域排涝模型，以广州市芳村高尔夫地块为研究区域，基于研究区域实测降雨、径流等资料对模型进行参数率定和验证，模拟在不同暴雨重现期下已建城市区域雨水管网的排涝能力。研究结果表明：该区域遭遇2 a 一遇暴雨时，J14、J15 和J31 等3 个排水节点出现积水；当遭遇5 a 一遇时，J15 片区和J31 节点出现较为严重的积水，其中J15 和J31 节点积水量分别达到1 674、546 m³；积水时间分别为0.5、0.4 h。针对研究区域排水管网排涝能力偏低的现状，建议结合LID（Low Impact Development）措施，削减暴雨洪峰流量，提高区域排涝能力。文章构建的已建城市排水管网排涝能力评估方法，可识别区域主要积水黑点及管道满流管段，提供了一种动态、定性和定量评估排水管网能力的方法。

Evaluation of Drainage Capability of Urban Pipelines

Based on measured precipitation and runoff data of the residential district in Guangzhou, China, this paper simulated the drainage capability of pipe network under different return period in resident district using calibrated SWMM. The results suggest that when faced with two years’ return period rainstorm, water would accumulated at Nodes J14, J15 and J31, and water accumulation would become more serious with increasing return period. When faced with five years’ return period rainstorm, accumulated water amounts at Nodes J15 and J31 were 1674m3 and 546m3, respectively, and accumulated water times were 0.5h and 0.4h, respectively. In view of low pipe drainage capability in our country, this paper suggested using LID measures to reduce peak flow of storm flood, so as to improve the existing drainage capability of the network. This paper built an assessment method of drainage capability for the existing urban pipe network, which not only could identify the main water spots and pipe flow section, but also could provide a dynamic, qualitative and quantitative evaluation of the ability of the drainage pipe network.