基于输出系数模型的射洪县农村面源污染负荷估算

摘要

In order to analyze the non-point source pollution in Shehong Country,with the help of GIS,the pollution load was calculated by the export coefficient model.The calculation result showed that the total nitrogen(TN)and total phosphorus(TP) loads were 1 075.69,118.2 t/a,respectively,and the spatial distribution of TN and TP loads had the characteristics of uneven distribution;the contribution of the rural swage to NPS was the biggest,accounting for 61.09％ and 76.35％ of the total load of TN and TP respectively;the relative error were 8.2％ and 12.3％ of the total nitrogen and phosphorus load respectively by comparing the estimation load of modeling and the actual monitoring value.The results showed that the model had a high precision and could provide scientific data support for the water environment governance in Shehong County.%为分析射洪县农村面源污染状况,采用输出系数模型并借助GIS平台,对射洪县面源污染负荷量进行估算,得到结果如下:研究区2016年总氮、总磷的输出负荷量分别为1 075.69,118.2 t/a,且二者空间分布较为一致;农村居民生活污水为最主要污染源,分别占TN、TP总负荷的61.09％和76.35％;模型估算负荷与实际监测值对比得到总氮、总磷负荷值相对误差为8.2％和12.3％,模型模拟具有较高的精度,能够为射洪县水体环境治理提供参考.