Refined Estimation and Empirical Study of Non-point Source Pollution Load in Small Watershed:A Case Study of Yanghua River Basin,Chengdu
Accurately estimating non-point source pollution load is crucial for developing a standard-meeting water quality plan for the Yanghua River.By employing an improved output coefficient method,we estimated the total non-point source pollution load of Yanghua River small watershed,which is a tributary of the Tuojiang River.In consideration of the proportion of monthly rainfall in annual rainfall,we can obtain the refined estimation data of monthly distribution of non-point source pollution load.Our findings indicate that COD pollution in the watershed was most severe in 2020,with a total pollution load of 6 042.61 t,primarily concentrated in Zhuanlong Town,Zhu-gao Town,Hefeng Town,Yunlong Town,and Shijia Town.Non-point sources such as rural dispersed areas and large-scale livestock and poultry farming contributed significantly to pollutants such as COD,ammonia nitrogen,and total phosphorus.Additionally,we successfully obtained the preliminary monthly distribution of non-point source pollution load within the year.These results demonstrated good agreement with measured data,with an aver-age error less than 10％.Overall,our research outcomes provide essential data support for the refined management of water environment in the basin.
estimation of non-point source pollutionpollution load distributionimproved export coefficient methodYanghua River Basin
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