渠江流域水质变化特征及影响因素分析OACSTPCD

In order to explore the quality of water environment in the Qujiang River Basin and pollution causes in recent years,the monitoring data of 11 sections of the main stream and tributaries of the Qujiang River from 2015 to 2022 were analyzed using the single factor index method,Nemero pollution index method,and pollution index method based on principal component analysis.The results showed that from 2015 to 2022,the water quality of the main stream of the Qujiang River was better than that of its tributaries,and the water quality in the middle and upper reaches was better than that in the downstream.The overall water quality of the basin showed a trend of improvement;the seasonal variation of water quality in the Ba River,Qu River,Zhou River,and Qingxi River within the basin was not significant,while the seasonal variation of water quality in Tongbo River,Liujiang River,and Renshi River was significant,with the worst water quality in spring;the TP nutrient pollution index was the main indicator for controlling water quality pollution in the Qujiang River Basin,followed by the organic pollution indicators CODCr and IMn;the daily life of residents along the river and agricultural production activities such as planting and breeding were the main sources of water pollution in the Qujiang River Basin.