摘要
非点源污染是目前水体污染防治的主要对象,土地利用方式与污染物流失量密切相关。以桃林口水库流域为研究对象,通过构建SWAT非点源污染模型对流域非点源污染负荷进行模拟,研究不同土地利用结构对子流域TN、TP流失率的影响,并定量分析了研究区在2014和2019年土地利用类型下TN、TP流失量的变化。结果表明:构建的SWAT非点源污染负荷模型适用于该流域的非点源污染模拟,在单一的土地利用类型中,污染物流失率排序为耕地>草地>住宅用地>林地,与相对应的单一土地利用类型相比,林地的组合能有效降低子流域的污染物流失率;不同土地利用类型的产污能力差异较大,林地的单位面积产污量最低,耕地最高,与2014年相比,2019年流域林地面积增加而耕地和草地面积减少,TN、TP负荷分别减少了34.43%、23.75%。研究结果可为桃林口水库流域的水环境管理提供科学依据。
Non-point source pollution has become the main target of water pollution prevention and control,the polluant loss is closely related to the land use patterns.In this study,the non-point source pollution load in Taolinkou Reservoir basin was simulated by SWAT non-point source pollution model.The effects of different land use on nitrogen and phosphorus loss rates were studied,and the changes of non-point source pollution load loss under two land use patterns in 2014 and 2019 were quantitatively analyzed.The results showed that the SWAT non-point source pollution model was suitable for the simulation of non-point source pollution in the basin.In a single land use type,the pollutant loss rate ranked as follows:cultivated land(Ⅱ)>grassland(Ⅲ)>residential land(Ⅷ)>woodland(Ⅰ).The combination of woodland could effectively reduce the load loss rate of sub-basins,compared with any single land use.The pollution yield per unit area of different land use varied greatly,that of woodland was the lowest,whereas that of cultivated land was the highest.Compared with 2014,the area of woodland increased and the area of cultivated land and grassland decreased in 2019,and the output of TN and TP load decreased by 34.43% and 23.75%,respectively.The results of this study can provide a technical support for the water environment pollution management of the Taolinkou Reservoir basin.
作者
杨妮娟
王晓云
李建柱
张婷
冯平
YANG Nijuan;WANG Xiaoyun;LI Jianzhu;ZHANG Ting;FENG Ping(State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300350,China;China Water Resources Beifang Investigation,Design&Research Co.,Ltd.,Tianjin 300222,China)
出处
《水资源与水工程学报》
CSCD
北大核心
2023年第5期61-69,79,共10页
Journal of Water Resources and Water Engineering
基金
国家自然科学基金项目(52079086)。
关键词
非点源污染
氮磷污染负荷
土地利用方式
污染负荷流失
SWAT模型
桃林口水库流域
non-point source pollution
pollution load of nitrogen and phosphorus
land use pattern
pollution load loss
SWAT model
Taolinkou Reservoir basin
