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无锡市城区降雨特征对径流污染的影响分析 被引量:6

Effects of Rainfall Characteristics on Runoff Pollution in Urban Area of Wuxi
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摘要 选择无锡市沈巷小区、广丰三村、槐古豪庭三个经过雨污分流改造的排水区(以下简称"排水达标区")作为研究区域,对2014年7月1日至9月23日13次降雨事件中研究区域的降雨径流排水过程进行水质水量同步监测,分析了无锡城区主要地表径流污染物类型,比较了降雨特征(降雨历时、降雨量、降雨强度和前期累计晴天)与污染物次径流平均浓度EMC的相关性大小,选取典型降雨事件,研究了降雨径流初期冲刷效应。结果分析表明:虽然排水达标区已经完成雨污分流改造工程,但降雨径流污染仍然很严重,主要污染物为COD、NH3-N、TP;降雨强度与EMC有显著的正相关关系,其余降雨特征与EMC的相关性不明显;降雨初期的降雨强度对初期冲刷效应的影响较大,降雨初期雨强大,则初期冲刷效应明显。 The three residential quarters of Shenxiang, Guangfeng and Huaiguhaoting in Wuxi City were selected as the research areas,and water quality and quantity were synchronously monitored for the runoff drainage processes of 13 different rainfall events between 1st July and 23 th September, 2014.This paper analyzed the main surface runoff pollutants in the urban areas of Wuxi, and compared the correlations between rainfall characteristics and event mean concentration of pollutants. The initial flush effect was also studied on typical rainfall events. The results indicate that surface runoff pollution is still serious despite the reconstruction project of rain and sewage diversion has been accomplished in the selected areas, and the main pollutants include COD、NH3-N and TP. Besides, the EMC has a significant positive correlation with rainfall density while it has not obvious correlation with other characteristics. In addition, the density in the early stage of rainfall affects greatly on initial flush effect.
作者 洪国喜 袁梦琳 尤征懿 HONG Guoxi;YUAN Menglin;YOU Zhengyi(Wuxi Hydrology and Water Resources Survey Bureau of Jiangsu Province,Wuxi 214031,China;College of Hydrology and Water Resources,Hohai University,Nanjing 210098,China)
出处 《水文》 CSCD 北大核心 2019年第2期33-38,66,共7页 Journal of China Hydrology
关键词 城市地表径流污染 降雨特征 次径流平均浓度 初期冲刷效应 urban surface runoff pollution rainfall characteristics EMC initial flush effect
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