中文摘要：

以广西入海河流南流江2003—2011年水质数据为例,通过水文估算法和数字滤波法对点源和非点源污染负荷分别进行分割估算。结果表明,2003—2011南流江流域监测断面的非点源污染较为严重,采用水文估算法计算的多年平均硫酸盐、氯化物、硝酸盐氮、亚硝酸盐氮的非点源污染负荷占总负荷的比例分别为0.82,0.81,0.82,0.72;基于数字滤波法计算的多年平均硫酸盐、氯化物、硝酸盐氮、亚硝酸盐氮的非点源污染负荷占总负荷的比例分别为0.72,0.54,0.68,0.63。结果显示,这两种方法的污染负荷分割结果变化趋势大致相同。

英文摘要：

Hydrological estimation method and the digital filtering method are used to segment the point source pollution and non-point source pollution of sulfate,chloride,nitrate nitrogen and nitrite nitrogen in Nanliu River from 2003-2011.The results show that the non-point source pollution has become a relatively serious problem in Nanliu River.The calculations of hydrological estimation method show that the ratio of non-point source pollution to total pollution load of these four indexes is 0.82,0.81,0.82 and 0.72 respectively.And calculations of the digital filtering method indicate that ratio of four indexes is 0.72,0.54,0.68 and 0.63 respectively.The results show that the segmentation change trends of the pollution with two methods are close.