柳河流域特征污染物负荷模拟及污染源解析

基于通用流域负荷模型(GWLF模型),选取柳河流域为研究对象,利用2006-2014年的水文水质数据进行水文化学过程的模拟,评估流域节点断面的月径流量及特征污染物负荷通量,根据模型结果分析了特征污染物的污染来源及贡献率。结果表明,从年际变化上看,COD、氨氮和总氮的总负荷通量近年来有所下降,总磷的总负荷通量呈逐年上升趋势。从年均水平上看,COD、氨氮的点源污染与非点源污染贡献率相差不大,均接近50%;总氮的非点源污染贡献率远远高于点源污染,贡献率高达79.6%;总磷的污染来源主要为点源污染,贡献率高达74.9%。根据特征污染物的污染源解析结果,提出有针对性的削减和控制污染的措施,为流域水污染管控提供依据。

Simulation of characteristic pollutant load and analysis of pollution source in Liuhe River basin

The generalized watershed loading functio n ( GWLF) mo del was used in this paper to simulate the hydrochemical pr ocess o f Liuhe Riv er basin f rom 2006 to 2014, and to eva luate the mo nthly water flow and the load flux es o f characteristic pol2 lut ants in the basin. Acco rding to the mo del results, w e analyzed t he sources of the characterist ic po llutants and their contribu2 tion rates. T he r esults showed that in terms of inter annual variation, the total load flux o f COD, ammo nia nit rog en, and tot al ni2 tr og en decreased in r ecent years, and the tot al load flux o f total phospho rus incr eased y ea r by year. In terms of annua l av erag e level, the point source pollutio n and non2point source po llution made basically equiv alent co ntributio ns to COD and ammonia ni2 tr og en, bo th appro aching 50% . For to tal nitr ogen, the no n2 po int so ur ce pollutio n had a much hig her co ntribution rate ( up to 791 6% ) than t he point sour ce pollutio n. The main po llution source of to tal phospho rus was point so ur ce po llut ion, w hose con2 tribution rat e w as up to 741 9%