耦合改进输出系数法-SWAT模型的丹江口水库流域非点源污染模拟  

Simulation of Non-point Source Pollution in Danjiangkou Reservoir Basin Based on Coupled Improved Output Coefficient Method and SWAT Model

作　　者：翟文亮[1,2] 唐见[1,2] 汪成刚 李晓萌 赵科锋 ZHAI Wen-liang;TANG Jian;WANG Cheng-gang;LI Xiao-meng;ZHAO Ke-feng(Basin Water Environmental Research Department,Changjiang River Scientific Research Institute,Wuhan 430010,China;Key Lab of Basin Water Resource and Eco-environmental Science in Hubei Province,Changjiang River Scientific Research Institute,Wuhan 430010,China;Xiangyang Hydrological and Water Resources Survey Bureau,Xiangyang 441003,China)

机构地区：[1]长江科学院流域水环境研究所,武汉430010 [2]长江科学院流域水资源与生态环境科学湖北省重点实验室,武汉430010 [3]襄阳市水文水资源勘测局,湖北襄阳441003

出　　处：《长江科学院院报》2023年第7期50-58,共9页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金区域创新发展联合基金重点支持项目(U21A20156)。

摘　　要：为更精准评估南水北调中线工程通水后丹江口水库流域非点源污染特征,改善SWAT模型非点源模拟精度,耦合“产生-流失-入河”三阶段改进输出系数法-SWAT模型,对流域多类型的非点源污染入河过程进行综合模拟研究。结果表明:①应用改进输出系数法从产生、流失到入河,分3个阶段分别估算了畜禽养殖、农村生活和水产养殖污染的TP、TN等污染物指标的负荷量。②耦合SWAT水文模型,全面模拟分析丹江口水库流域2019年非点源污染负荷时空分布特征。将畜禽养殖、农村生活、水产养殖污染以县区为单元进行概化,以点源的形式加入SWAT模型;以汉江上游、丹江、老鹳河流域为参证流域,对模型水文参数率定验证,模拟结果可以满足模型精度要求。丹江口水库流域2019年TN、TP流失量分别为27.56万、1.86万t,TN、TP入河量分别为3.31万、0.24万t,其中种植业的贡献率最大,分别为72.45%、64.97%;从空间上看,汉滨区、旬阳县、郧阳区、洋县、西乡县等5县区的TN、TP入河量较大,商州区、凤县、张湾区、太白县、略阳县、留坝县等6县区的TN入河量较小;从时间上看,5月份贡献率最大,10月份贡献率最小。研究结果可为丹江口水库流域非点源污染综合管控提供一定的科学依据。This study aimed to evaluate more accurately the characteristics of non-point source pollution in the Danjiangkou Reservoir basin following the water supply of the middle route of the South-to-North Water Transfer Project.The aim was also to improve the accuracy of SWAT model in simulating non-point source pollution.To accomplish this,we coupled the improved output coefficient method and SWAT model to conduct a comprehensive simulation on the process of multi-type non-point source pollution entering the river.First,the improved output coefficient method estimated the load of TP,TN,and other pollutant indicators related to livestock and poultry,rural life,and aquaculture pollution in three stages from generation,loss,to entering the river.Second,the SWAT hydrological model comprehensively simulated and analyzed the temporal and spatial distribution characteristics of non-point source pollution in the Danjiangkou Reservoir basin in 2019.The pollution from livestock and poultry breeding,rural life,and aquaculture industries was generalized at the county level and added to the SWAT Model in the form of point sources.The model’s hydrological parameters were calibrated and verified for accuracy with Hanjiang River,Danjiang River and Laoguan River basins as reference basins.Results reveal that,in the Danjiangkou Reservoir basin in 2019,the loss of TN and TP was 275600 tons and 18600 tons,respectively.The inflow of TN and TP into the river was 33100 tons and 2400 tons,respectively.The planting industry was the primary contributor to both TN and TP inflow,accounting for 72.45%and 64.97%,respectively.The amount of TN and TP entering the river was greatest in Hanbin District,Xunyang County,Yunyang District,Yangxian County,and Xixiang County,while the smallest was recorded in Shangzhou District,Fengxian County,Zhangwan District,Taibai County,Lueyang County,and Liuba County.The contribution rate was the highest in May and the lowest in October.The research findings provide scientific basis for the comprehensive management a

关 键 词：农业非点源污染 改进输出系数法 SWAT 产生-流失-入河 丹江口水库流域 

分 类 号：TV121[水利工程—水文学及水资源]