湘江流域(湖南段)水质时空分布特征及污染源解析OACSTPCD

In order to explore the spatial and temporal distribution characteristics of water quality and pollution sources in Xiangjiang River Basin(Hunan section),the water quality at main sections along the main channel of Xiangjiang River in 2022 was statistically analyzed,and the composition of water pollution sources was determined through cluster analysis and principal component analysis.The results showed that the overall water quality of Xiangjiang River Basin was good,and the main out-of-standard pollutants in individual sections were total phosphorus and ammonia nitrogen.The monitoring section of the basin can be divided into two groups in space.The cluster analysis showed that the electrical conductivity,permanganate index and ammonia nitrogen concentration of Cluster I(lower reach of the Xiangjiang River)were higher by 52.63％,31.57％and 43.93％than those of Cluster Ⅱ(upper reach of the Xiangjiang River).The results of principal component analysis further showed that domestic and agricultural sources were still the main pollution sources in the Xiangjiang River Basin,but the change of pollutant concentration caused by the change of hydrological and meteorological conditions and the input of pollutant in flood season were still important factors that cannot be ignored.In order to further improve the water quality of Xiangjiang River Basin,it is urgent to deeply analyze and grasp the spatial-temporal changes of water quality in the Basin,and put forward targeted measures to control pollutants,and effectively prevent the occurrence of regular or seasonal pollutants beyond the criteria.