基于主成分分析的洱海北部入湖河流水质评价及变化趋势研究OACSTPCD

The water quality of nine monitoring points of the northern three rivers(Miju River,Yong'an River and Luoshi River)of Erhai Lake from 2015 to 2022 was synthetically analyzed with the Principal Component Analysis(PCA)method.The comprehensive score was calculated according to the analysis of each component,and the main influencing indicators were analyzed to study the spatial variation characteristics and temporal variation trend of water quality,so as to provide a basis for pollution prevention and water ecological environment protection and comprehensive treatment in the northern Erhai Lake.The results indicated that the main pollution was organic contaminants in the northern three main rivers of Erhai Lake.The water quality of Miju River was better than Yongan River and Luoshi River according to the synthetic assessment method of PCA.It appeared that descendant tendency about synthetic score of three northern main rivers of Erhai Lake from 2015 to 2022.This indicated that the contaminated load of water quality decreased by year.The water quality of three northern rivers of Erhai Lake was evidently improved from 2021 to 2022.