西丽水库流域面源污染负荷估算研究

A Study on the Non-point Source Pollution Distribution Characteristic of Xili Reservoir Watershed

本研究采用现场调查和试验室分析的方法,计算了西丽水库流域的面源污染负荷;另外,在GIS技术的支持下,采用通用土壤流失方程USLE和径流曲线数目方程SCS对西丽水库流域的泥沙、氮磷和有机污染物输出特征进行了详细地分析。结果显示,西丽水库流域的面污染负荷输出TP、TN、COD和SS分别为179.70,5674.87,39452.92和130954 kg/(km2.a),由于果园占地面积较大,其贡献的氮磷和有机污染物总量最大(分别为TN 52%,TP 58%,COD 41%),是西丽水库流域最主要的面源污染来源。实证研究和模型估算的结果证明,这两个模型都可较好地用于西丽水库面源污染负荷的估算。

The output load of non-point source pollution of Xili Reservoir watershed was calculated by the method of actual survey including water quality analysis, which distribution characteristic was analyzed in detail using two equations named USLE and SCS with the help of GIS technology, and the results demonstrated that the output loads of non-point source pollution of xili Reservoir watershed about TN,TP,COD and SS were 179.70,5674.87,39452.92 and 130954 kg/ （km^2·a） respectively, therefore Xili Orchard is the key source of non-point source pollution in this region.