六股河绥中县境内面源污染特征分析

Analysis on Characteristics of Non-point Source Pollution in Liugu River along Suizhong County

文章以六股河绥中县境内的面源污染为例,采用水文模型SWAT调查、模拟和监测该流域的面源污染特征,通过分析主要污染区和污染源地区揭示面源污染分布特征。研究表明:径流、氮磷负荷的相对误差Re处于10%-30%,确定性系数R2位于0.74-0.85,纳什效率系数Ens为0.62-0.75,SWAT模型具有良好的适用性和可行性;各子流域以面源污染为主,并且以农业化肥和农村生活污染的影响最为显著;TP产量、TN产量受农业化肥和农村生活污染影响最为显著,绥中县非点源污染重点治理区为10#子流域。

Taking the non-point source pollution in Suizhong county of Liupuhe County as an example,the hydrologic model SWAT was used to investigate,simulate and monitor the characteristics of non-point source pollution in the basin,and the distribution characteristics of non-point source pollution were revealed by analyzing the main pollution areas and pollution source areas.The research shows that:the relative error Re of runoff and nitrogen and phosphorus load is between 10%and 30%,the deterministic coefficient R2 is between 0.74 and 0.85,and the Nash efficiency coefficient Ens is between 0.62 and 0.75,therefore,the SWAT model has good applicability and feasibility;the non-point source pollution was the main pollution in each sub-basin,and the influence of agricultural fertilizer and rural domestic pollution was the most significant,TP output and TN output were most significantly affected by agricultural fertilizers and rural domestic pollution,and the key non-point source pollution control area of Suizhong County is No.10 sub-watershed.