流域水环境污染模拟及关键源区鉴别——以义乌江流域为例  

Simulation of water environmental pollution and identification of key source areas——A case study of Yiwu River Basin

作　　者：张京 郑华[1,2] 何梦男 马金锋 ZHANG Jing;ZHENG Hua;HE Mengnan;MA Jinfeng(State Key Laboratory of Urban and Regional Ecology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;University of Chinese Academy of Sciences,Beijing 100049,China;Institute for Eco-environmental Research,Nanjing Hydraulic Research Institute,Nanjing 210029,China)

机构地区：[1]中国科学院生态环境研究中心城市与区域生态国家重点实验室,北京100085 [2]中国科学院大学,北京100049 [3]南京水利科学研究院生态环境研究所,南京210029

出　　处：《环境工程学报》2021年第4期1167-1177,共11页Chinese Journal of Environmental Engineering

基　　金：国家重点研发计划课题(2019YFD0901105);国家自然科学基金资助项目(51209194)。

摘　　要：以义乌江流域为研究区,应用SWAT模型模拟流域的径流、泥沙与水质过程,在分析流域内水文过程与污染负荷(总氮、总磷)时空分布特征的基础上,采用单位面积负荷指数法确定各子流域的氮磷流失强度,并划分5个等级,进而识别水环境污染的关键源区。结果表明:1)生活污染源是义乌江流域水环境污染的主要来源,氮磷的输入占比分别为52.7%和61.9%;2)氮、磷污染负荷排放主要集中在3—7月,分别占全年的66%和63%,高负荷强度区主要集中在义乌市城西街道、佛堂镇、东阳江镇和双溪乡;3)义乌江流域的关键源区为18个子流域中的4个子流域。基于流域水环境污染定量模拟识别,建立了关键污染源区的识别方法,可为高污染负荷流域的水环境污染防控提供参考。The runoff,sediment and water quality processes of the Yiwu River Basin were simulated based on SWAT model.The Load Per Unit Area Index mothod was used to calculate the intensity of nitrogen and phosphorus loss and divide the loss intensity into five gradesfor the identification of the key source areas.Results show that domestic pollution sources are the main sources of water environmental pollution in Yiwu River basin,and the input proportion of nitrogen and phosphorus is 52.7%and 61.9%respectively.Nitrogen and phosphorus pollution load mainly concentrated in the flood season(March to July),accounting for 66%and 63%of the whole year respectively.The high load areas of nitrogen and phosphorus pollution are mainly concentrated in Chengxi street,Fotang town,dongyangjiang Town and Shuangxi township.The key source area of Yiwu River Basin are 4 of the 18 sub-basins.Based on the quantitative simulation identification of water environmental pollution in the river basin,this study established the identification method of key pollution source area,which can provide reference methods for the prevention and control of water environmental pollution in the river basin with high pollution load.

关 键 词：水环境污染 义乌江流域 SWAT 水资源短缺 污染负荷 时空分布 关键源区 

分 类 号：X502[环境科学与工程—环境工程]