城市排水管网的变化对其控制区域内的产流量、下渗量以及洪峰流量有着较大影响.利用ArcGIS水文分析模块将研究区域划分为若干自然汇水区域,考虑道路和大型建筑物对水流约束作用,再对研究区域细分为更多的子汇水区域,率定SWMM(雨洪管理模型)模型参数,在研究区域上建立起了基于两套不同管网条件的SWMM工程,以南京市P为30%的24 h降雨过程为降雨输入,进行模拟分析.结果表明受管网增加影响的子汇水区域下渗量有所减少,径流量有所增加,洪峰流量增大,且洪峰出现时间提前.%Changes of pipe networks have great influence on runoff, infiltration and peak discharge. In this paper, the study area is first divided into several natural watersheds by ArcGIS's hydrological analysis module. Considering the restraint effects of roads and huge buildings, the natural watersheds are then divided into more subcatchments. After calibrating SWMM's parameters, two SWMM projects are established based on two different pipe networks, which adopt 24-h rainfall process with frequency of 30％ in Nanjing as rainfall input data. The results show that the infiltration decreases but the runoff and peak discharge increase in the affected areas. And the flood peak occurs earlier.
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