长沙市城区雨水径流污染研究

摘要

It is a critical basis for utilization of rainfall resource and pollution control of runoff in urban area to understand runoff quality and its main influential factors. In this paper, the runoff quality change rule in different underlaying surfaces was analyzed as well as the correlation of main pollutants. The results showed that the rainwater runoff was seriously polluted initially, had high content of pollutants. With runoff time continuing, the pollutant content presented downward trend, and there was a fine linear relation between COD, TP, TN and SS in runoff.%掌握城区雨水径流水质及其主要的影响因素是有效地利用城区雨水资源和控制城市非点源污染的基础。对长沙城区不同下垫面的雨水径流进行监测，分析不同下垫面雨水径流水质的变化规律及主要污染物的相关性，分析结果表明：径流初期下垫面的雨水污染较严重，污染物浓度较高。随着径流时间的持续，各污染物浓度呈下降趋势，且径流中的 COD、TP、TN 与 SS 之间存在较好的线性相关关系。