基于SWAT模型的白洋淀流域总氮负荷模拟研究

摘要

在白洋淀水质现状评价的基础上，以营养元素总氮为指示因子，用SWAT模型分析白洋淀流域污染负荷影响因素，模拟各类污染源的贡献值及分布。结果表明，相对于环境背景值，添加面源或点源排放后，总氮负荷分别增加了64%和116%。白洋淀流域总氮多年平均面源负荷贡献率为33.8%，点源负荷贡献率为66.2%，且汛期总氮负荷量远高于非汛期。%Based on the water quality assessment and with TN as the indicator factor,the influencing factors of pollution load of Baiyangdian basin were analysed and the contribution of the various types of pollution sources and distribution were simulated by using the SWAT model. The results show that relative to the environmental background values, TN load respectively increased by 64% and 116%, after adding the emissions of non-point source or point source. Annual average contribution rate of non-point source load of TN was 33.8%,and the point source load was 66.2%, and TN load in flood season was much higher than in the non-flood season.