降雨初期冲刷效应及弃流时间分析——以徐州市城市道路为例  

First Flush and Initial Split-Flow Time in the Initial Rainfall:A Case Study of Urban Roads in Xuzhou City

作　　者：吕志丹 李慧娴 刘阳 梁森 王琳芳 LYU Zhidan;LI Huixian;LIU Yang;LIANG Sen;WANG Linfang(Xuzhou Project Department,Intelligent Water(Beijing)Co.,Ltd of China South-to-North Water Diversion Eastern Route Corpora-tion Limited,Xuzhou 221018,Jiangsu,China;Xuzhou River and Lake Management Center,Xuzhou 221018,Jiangsu,China;Xuzhou Water Conservancy Architectural Design and Research Institute Co.,Ltd.,Xuzhou 221116,Jiangsu,China)

机构地区：[1]南水北调东线智能水务(北京)有限公司徐州项目部,江苏徐州221018 [2]徐州市河湖管理中心,江苏徐州221018 [3]徐州市水利建筑设计研究院有限公司,江苏徐州221116

出　　处：《三峡生态环境监测》2024年第1期28-37,共10页Ecology and Environmental Monitoring of Three Gorges

基　　金：徐州市科技项目(KC20060)。

摘　　要：降雨初期冲刷效应的判断对城市径流污染控制的解决方向起决定性作用,而初期雨水的弃流时间对海绵城市雨水污染的源头控制在工程实际中的应用具有重要的参考价值。本文对徐州市城市道路径流中5种主要径流污染物——悬浮物(suspended solids,SS)、化学需氧量(chemical oxygen demand,COD)、氨氮(ammonia nitrogen,NH_3-N)、总氮(total nitrogen,TN)、总磷(total phosphorous,TP)进行分析,采用M(V)曲线法(污染物负荷累积率随径流量累积率的变化曲线)分析并对比相关水质标准,分析道路径流的初期效用及弃流时间。结果表明,徐州市城市道路径流存在明显的初期冲刷效应,且初期冲刷效应SS>COD> TP>NH_3-N>TN;SS初期冲刷效应随雨强增大而增加,COD、NH_3-N、TN、TP初期冲刷效应随雨强增大而减小;可将产流后20 min作为徐州市城市道路初期雨水的弃流时间,为海绵城市雨水源头控制提供参考依据。The judge of first flush is a key event on the pollution control of urban runoff,and the initial split-time contributes a lot to the application of runoff source control in sponge city.This paper use M(V)curve method(cumulative rate ratio curve of pollut-ant load compared with runoff)to analyze the five capital runoff pollutions,such as SS,COD,NH3-N,TN,TP of urban roads in Xu-zhou City.And it made a comparision among the relevent water quality standards and analyzced the initial utility and split-flow of runoff.The results indicate that the initial runoff of urban roads has significant effects on first flush in Xuzhou City,and increased on SS,COD,TP,NH3-N,TN in order.The initial flush effects of SS increased with the increase of rainfall intensity and the initial flush effects of COD,NH3-N,TN and TP decreased with the increase of rainfal intensity.20 minutes after runoff can be used as the initial split-flow time of urban roads in Xuzhou City.This study provided a basis for controlling pollution from the source in sponge cities.

关 键 词：初期径流 城市道路 初期冲刷 M(V)曲线 初期弃流时间 

分 类 号：P49[天文地球—大气科学及气象学]