初期雨水污染特征及截流量分析  

Analysis on initial rainwater pollution characteristics and cut-off volume

作　　者：操李琎 胡真虎[1] CAO Lijin;HU Zhenhu(School of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学土木与水利工程学院,合肥230009

出　　处：《工业用水与废水》2023年第3期47-53,共7页Industrial Water & Wastewater

基　　金：安徽省科技重大专项(18030801102)。

摘　　要：为研究初期雨水径流污染特征和截留量,对某汇水区的雨水径流污染指标(COD、SS、NH_(4)^(+)-N、TN、TP)进行监测,分析各污染指标随降雨时间的变化特征,并通过无量纲曲线和质量比率曲线判断降雨对该区域的冲刷效应,最后根据无量纲曲线分析结果确定截流量。研究结果表明,初期雨水径流污染与降雨强度和雨前晴天数有关,降雨强度越大,雨前晴天数越多,初期雨水所产生的污染越严重;降雨对于该区域的冲刷效应不仅与降雨强度有关,还受降雨雨型密切影响;经过无量纲曲线分析,确定其截流量为雨水径流体积的45%~50%。In order to study the characteristics of rainwater runoff pollution in the initial stage and the cut-off volume,the rainwater runoff pollution indicators includes:COD,SS,NH_(4)^(+)-N,TN,and TP in a catchment area were monitored,and the variation characteristics of the above indicators along with rainfall time were analyzed.The scour effect of rainfall on the area was judged by dimensionless curve and mass ratio curve,finally,the cut-off volume was determined according to the analysis result of dimensionless curve.The study results showed that,the pollution of initial rainwater runoff was related to rainfall intensity and the number of clear days before rain.The greater the rainfall intensity,the greater the number of clear days before rain,the more serious the pollution caused by initial rainwater would be.The scour effect of rainfall on this region is not only related to rainfall intensity,but also closely affected by rainfall pattern.Through the analysis of the dimensionless curve,it is determined that the cut-off volume is 45%-50%of the volume of rainwater runoff.

关 键 词：初期雨水 污染特征 降雨强度 雨前晴天数 冲刷效应 截留量 

分 类 号：TU991.2[建筑科学—市政工程] R123.2[医药卫生—环境卫生学]