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引用本文:周峰,曹明明,柯凡,张浏,冯慕华,李文朝.巢湖流域塘西河上游分流制系统降雨径流污染特征及初期冲刷效应.湖泊科学,2017,29(2):285-296. DOI:10.18307/2017.0204
ZHOU Feng,CAO Mingming,KE Fan,ZHANG Liu,FENG Muhua,LI Wenchao.Analysis of pollution characteristics and first flush effect in rainfall runoff in separate storm sewer system in upstream of Tangxi River,Chaohu Catchment. J. Lake Sci.2017,29(2):285-296. DOI:10.18307/2017.0204
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巢湖流域塘西河上游分流制系统降雨径流污染特征及初期冲刷效应
周峰1, 曹明明1, 柯凡2,3, 张浏4, 冯慕华2, 李文朝2,3
1.西北大学城市与环境学院, 西安 710127;2.中国科学院南京地理与湖泊研究所, 南京 210008;3.江苏高校水处理技术与材料协同创新中心, 苏州 215009;4.安徽省环境科学研究院, 合肥 230001
摘要:
研究城市径流水质变化及初期冲刷效应对控制与治理城市径流污染具有重要指导意义.对塘西河上游6次降雨径流水质水量进行监测分析,计算次降雨径流平均浓度(EMC)和单位面积次降雨径流污染负荷(EPL),作M(V)曲线图研究初期冲刷现象.结果表明:降雨径流中悬浮物(SS)、化学需氧量(CODCr)和总磷(TP)的EMC值相对较大;SS的EMC值波动最为显著;总氮(TN)、TP、CODCr、SS间的EMC值均呈正相关;TN的EMC值与降雨量呈负相关性.各污染物EPL值与各降雨特征间均呈正相关性,经估算2015年研究区在68月共有10.38 t TN、2.29 t TP、1022.43 t SS、161.70 t CODCr和5.18 t NH3-N随降雨径流排入巢湖;降雨量和雨前干期是城市径流污染的主要影响因素;以FF50>50为初期冲刷效应判别依据,5种污染物均有初期冲刷效应出现,冲刷程度表现为SS>CODCr > TP > TN > NH3-N;各水质指标的初期冲刷强度与降雨特征之间无相关性;雨型对初期冲刷现象影响较大;当降雨强度达1.36 mm/h即有径流汇集流出时开始截流,截流时间取440 min,截取的最大径流量取224319.14 m3.
关键词:  塘西河  分流制排水系统  城市雨水径流  初期冲刷  M(V)曲线  巢湖流域
DOI:10.18307/2017.0204
分类号:
基金项目:国家水体污染控制与治理科技重大专项(2012ZX07103)资助.
Analysis of pollution characteristics and first flush effect in rainfall runoff in separate storm sewer system in upstream of Tangxi River,Chaohu Catchment
ZHOU Feng1, CAO Mingming1, KE Fan2,3, ZHANG Liu4, FENG Muhua2, LI Wenchao2,3
1.College of Urban and Environmental Sciences, Northwestern University, Xi'an 710127, P. R. China;2.Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;3.Jiangsu College of Water Treatment Technology and Material Collaborative Innovation Center, Chinese Academy of Sciences, Suzhou 215009, P. R. China;4.Anhui Institute of Environmental Science, Hefei 230001, P. R. China
Abstract:
Understanding the runoff water quality and first flush effects can guide the management of urban runoff pollution.Six rainfall events were monitored and event mean concentration(EMC) and event pollutant loads per unit area(EPL) were calculated in the upstreams of Tangxi River. The M(V) curve was used to show the first flush effects. The results showed that the EMC of suspended solids(SS), chemical oxygen demand(CODCr) and total phosphorous(TP) were relatively large in rainfall runoff. The EMC of SS has the most significant fluctuations. There was a positive correlation beween total nitrogen(TN), TP, CODCr and SS. The EMC of TN was negatively correlated with the rainfall. The EPL of runoff water pollution has a positive correlation with the rainfall characteristics. Approximately 10.38 t TN, 2.29 t TP, 1022.43 t SS, 161.70 t CODCr and 5.18 t NH3-N were input into the Lake Chaohu via runoffs in June, July, and August, 2015.Rainfall and antecedent dry weather period were the main influencing factors of the urban storm runoff pollution. Five kinds of pollutants had their own first flush effects, employing the FF50>50 as the standard, the magnitude of the first flush effect was SS>CODCr > TP > TN > NH3-N. There was no correlation between the magnitude of first flush and rainfalls. The rainfall pattern could have a strong effect on the first flush effect. It is recommended to closure the runoffs when the rain intensity reaches to 1.36 mm/h, i.e. the runoffs begin to converge with the duration of 440 min,and the maximum intercept runoff amounts is 224319.14 m3.
Key words:  Tangxi River  separate storm sewer system  urban stormwater runoff  first flush  M(V) curve  Chaohu Catchment
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