降雨污染影响城市河道温室气体排放特征及机制  

Characteristics and Mechanisms of Rainfall-induced Pollution Influencing Greenhouse Gas Emissions from Urban River Channel

作　　者：李鹤男 范波 刘茜 黄鹏 孙永利 LI He-nan;FAN Bo;LIU Qian;HUANG Peng;SUN Yong-li(Guangxi Key Lab of Mangrove Conservation and Utilization,Guangxi Academy of Marine Sciences,Beihai 536000,China;North China Municipal Engineering Design&Research Institute Co.Ltd.,Tianjin 300074,China)

机构地区：[1]广西海洋科学院<广西红树林研究中心>广西红树林保护与利用重点实验室,广西北海536000 [2]中国市政工程华北设计研究总院有限公司,天津300074

出　　处：《中国给水排水》2025年第3期114-118,共5页China Water & Wastewater

基　　金：国家重点研发计划项目(2022YFE020800)。

摘　　要：当前许多城市和地区由于排水系统不完善,管网混接错接现象严重,城市水体降雨污染问题普遍存在。基于此,考察了华北地区典型城市河道温室气体(CO_(2)、CH_(4)和N_(2)O)排放情况,并分析了夏季降雨污染影响水体温室气体排放的特征和机制。结果显示,夏季雨后城市河道表层底泥的氧化还原电位(ORP)下降明显,雨后河道温室气体排放通量激增,河道释放温室气体产生的全球增温潜势(GWP)是雨前的160.6倍,并伴随河道污染物的增加;河道底泥是温室气体主要产生和释放源,且河道温室气体释放量与表层底泥ORP变化密切相关。另外,氨氮、ORP、温度等环境因素与水体温室气体排放显著相关。Currently,owing to the inadequate drainage system in numerous cities and regions,the issue of improperly connected pipe networks is prevalent,leading to widespread rainfall-induced pollution of urban water bodies.This study investigated the greenhouse gas(CO_(2),CH_(4),and N_(2)O)emissions from a typical urban river channel in North China and analyzed the characteristics and mechanism of summer rainfall-induced pollution affecting theses emissions.After the summer rainfall,the oxidation-reduction potential(ORP)of the surface sediment in the urban river channel decreased significantly,and there was a significant increase in greenhouse gas emission flux from the river channel.The global warming potential(GWP)caused by greenhouse gas emission from the river channel was 160.6 times higher than that before the rainfall.Additionally,pollutant concentrations in the river channel also increased.The river sediment constituted the primary source of greenhouse gas production and emission,with the release of greenhouse gas from the channel being intricately linked to variation in the ORP of the surface sediment.Furthermore,environmental parameters such as ammonia nitrogen,ORP and temperature were significantly correlated with greenhouse gas emissions from the river.

关 键 词：降雨污染 城市河道 温室气体 排放特征 

分 类 号：TU992[建筑科学—市政工程]