基于MIKE21水质与水动力模型的清江流域水质改善措施影响研究  

Research on the Improvement of Water Quality Based on MIKE21 Water Quality and Hydrodynamic Model

作　　者：叶永[1] 陈雪倩 汪旭 YE Yong;CHEN Xue-qian;WANG Xu(College of Hydraulic and Environmental Engineering,China Three Gorges University,Yichang 443002,Hubei Province,)

机构地区：[1]三峡大学水利与环境学院,湖北宜昌443002

出　　处：《中国农村水利水电》2025年第4期14-19,共6页China Rural Water and Hydropower

基　　金：“十四五”国家重点研发计划课题项目(2021YFC3001903);三峡大学人才科研启动基金项目(2023RCKJ0028)。

摘　　要：为探讨清江长阳县城区段水环境污染物浓度变化情况,基于MIKE21水动力水质耦合模型进行3种水文条件(丰水年、平水年、枯水年)下的水环境模拟研究,采用单因素污染指数评价污染因子NH_(3)-N和TN两个指标,并对不达标场景提出3种排污口污染物排放改善措施。结果表明:清江城区段水质特征为丰水年污染物含量优于平水年,而枯水年水质最差,NH_(3)-N和TN浓度超标较多,无法由河段的自净能力来降低但通过降低排污口污水浓度后得到明显改善,TN降幅最高可达15%,NH_(3)-N降幅最高达到20%。研究结果有利于更好地了解长阳县城区污水排放对清江水质的影响机理,为清江城区段污染的防治和改善提供参考。In order to explore the changes of water environment pollutant concentrations in the urban section of Qingjiang River in Changyang County,a water environment simulation study under three hydrological conditions(wet year,normal water year and dry year)was carried out based on the MIKE21 hydrodynamic water quality coupling model,and the single factor pollution index was used to evaluate the NH_(3)-N and TN indicators,and three pollutant discharge improvement measures were proposed for the non-standard scenarios.The results show that the water quality of the Qingjiang River urban section is characterized by a better pollutant content in wet years than in normal water years,while the water quality in dry years is the worst,and the NH_(3)-N and TN concentrations exceed the standard,which cannot be reduced by the self-purification capacity of the river section.However,by reducing the concentration of sewage at the outfall,the reduction of TN can reach up to 15%,and the reduction of NH_(3)-N can reach up to 20%.The results of this study are helpful to better understand the impact mechanism of sewage discharge on the water quality of Qingjiang River in Changyang County,and provide a reference for the prevention and improvement of pollution in the urban section of Qingjiang River.

关 键 词：清江流域 水动力与水质模拟 MIKE21 污染物扩散 水质评价 

分 类 号：X522[环境科学与工程—环境工程]