城市降雨及雨水径流对河道水质的影响  

Influences of urban rainfall and its runoff on water quality of rivers

作　　者：李昂[1] 刘加强[1] 刘超 葛松健 Li Ang;Liu Jiaqiang;Liu Chao;Ge Songjian(School of Ewironmental Engineering,Xuzhou Institute of Technology,Xuzhou 221111,China)

机构地区：[1]徐州工程学院环境工程学院,江苏徐州221111

出　　处：《供水技术》2022年第3期49-53,共5页Water Technology

基　　金：徐州市重点研发计划(KC19218)。

摘　　要：降雨对大气污染物的淋洗及其对地表的冲刷导致污染物质随径流雨水进入水体,从而对水环境产生影响。通过对徐州市2021年三场典型降雨时的天然雨水、雨水径流及降雨前后河道水质进行分析,考察城市降雨及其径流对河道水质的影响效果。结果表明:降雨前的干旱天数对降雨及其径流水质影响较为明显,第二场降雨(干旱天数10 d)所测得的天然雨水和雨水径流中的COD_(Cr)和SS等指标大多高于第一场(5 d)及第三场降雨(7 d),且降雨初期雨水及其径流水质均明显较差;下垫面特征对径流雨水水质影响明显,路面径流雨水水质比屋面径流差,商住区路面径流雨水比学校、绿地为主的径流雨水水质差;降雨前后河道水质发生变化,且降雨后河道下游水质变化更为明显,说明降雨及雨水径流在一定程度上对河流水质产生了影响。Due to the leaching of air pollutants by rainfall and its scouring on the ground surface,the contaminants enter the water body with the runoff of urban rainwater,which has an impact on the water environment.The effects of urban rainfall and its runoff on river water quality were investigated by analyzing the natural rain water,runoff water and river water quality before and after three typical rainfall events in Xuzhou 2021.The results showed that the number of dry days before rainfall had a significant effect on rainfall and runoff water quality,the indexes of COD_(Cr) and SS in the second rain(10 days of drought)were higher than those in the first rain(5 days)and the third rain(7 days)The characteristics of underlying surface had a great influence on the quality of rainwater runoff.The quality of rainwater runoff from road surface was worse than that from roof,and that from commercial and residential areas was worse than that from schools and green areas,the change of water quality in the lower reaches of the river was more obvious after rainfall,which indicated that rainfall and runoff had an effect on the water quality of the river to a certain extent.

关 键 词：雨水径流 水质分析 面源污染 COD SS 

分 类 号：TU991[建筑科学—市政工程]