城市降雨径流水质特征及其对河道水质的影响  

Characteristics of Urban Runoff Quality and Influence on 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 Environmental 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：《市政技术》2022年第6期115-119,共5页Journal of Municipal Technology

基　　金：徐州市重点研发计划(KC19218)。

摘　　要：城市地表径流是第二大城市水环境污染源。作为降雨径流中的主要污染物,氮、磷等营养元素以径流形式排入地表水体,在一定程度上会对地表水环境质量造成影响。针对徐州市2021年夏季3场降雨时的天然雨水、不同下垫面径流雨水以及降雨前后河道中的营养元素(TN、TP)进行分析,发现降雨前的干旱天数与径流雨水中的营养元素含量相关性不大;下垫面形式与径流雨水水质有关,路面径流雨水比屋面径流雨水水质差;与以学校、绿地为主的径流雨水相比,商住区路面径流雨水TN质量浓度较高、TP质量浓度较低;河道中营养元素含量受降雨径流影响较为明显。Urban surface runoff is the second water pollution source.As the main pollution index of rainfall runoff,nutrient elements of nitrogen and phosphorus are discharged into surface water body in the form of runoff,which affects surface water environmental quality to some extent.Taking three rainfalls in Xuzhou in summer of 2021 as examples in this paper,the natural rain water,the runoff water of different underlying surfaces and the nutrient elements in the river course before and after the rainfall were analyzed.It was found that the dry days before rainfall had little correlation with nutrient elements content in runoff;The type of underlying surface was related to the runoff water quality.The quality of runoff water from road was worse than that from roof;Compared with runoff of school and greenland,the quality concentration of TN was higher and one of TP was lower in the surface runoff of commercial and residential areas.The nutrient element content in the river was obviously influenced by runoff.

关 键 词：降雨径流 水质分析 营养元素 面源污染 

分 类 号：X522[环境科学与工程—环境工程]