广州校园区降雨径流污染的初期冲刷效应

First Flush Effect of Urban Rainfall Runoff Pollution from Campus in Guangzhou,China

对广州市华南理工大学五山校区2012年6-8月4场次实测降雨径流污染的初期冲刷效应进行了研究，结果表明，污染物TSS、COD、TN、TP、TCu、Zn、总硬度、NO2--N、NH3-N、SO2-4等均存在不同程度的初期雨水径流冲刷现象．根据其中3场次降雨的总体结果分析发现：初期20％径流携带的TSS负荷量为其总量的7.0％～39.4％，COD为20.4％～56.0％，TN为13.8％～35.2％，TP为16.0％～35.2％；初期30％径流携带的TSS负荷量为其总量的18.6％～56.1％，COD 为37.8％～72.6％，TN 为22.8％～43.2％，TP 为24.3％～53.1％．对主要污染物TSS、COD、TN、TP的初期冲刷强度与降雨时间、降雨量、平均雨强、最大雨强、最大雨强出现时间、雨前干燥天气期之间的相关性分别进行分析，结果表明，除个别因素显著相关外，总体上表现为相关但不显著或不相关．

This paper deals with the first flush effects of four monitored rainfall runoff events in South China Univer-sity of Technology in Guangzhou from June,2012 to August 2012.The results show that the first flush phenomena at different degrees exist in TSS,COD,TN,TP,TCu,Zn,total hardness,NO2--N,NH3-N and SO2-4 .The analy-sis results of three rainfall events show that the first 20%of the runoff volume carries the pollution load of 7.0%-39.4%for TSS,20.4%-56.0%for COD,13.8%-35.2%for TN and 16.0%-35.2%for TP,while the first 30%carries 18.6%-56.1%for TSS,37.8%-72.6%for COD,22.8%-43.2%for TN and 24.3%-53.1%for TP.Moreover,it is demonstrated that,except for a few significant correlative cases,there is no significant correla-tion or only low correlation between the first flush intensity of TSS,COD,TN as well as TP and the weather para-meters such as rainfall time,rainfall volume,average rainfall intensity,maximum rainfall intensity,appearance time of maximum rainfall intensity and antecedent dry weather period.