州河水质评价及溶解氧与各项水质指标相关性分析

Water Quality Evaluation and Correlation Analysis between Dissolved Oxygen and Various Water Quality Indicators in Zhou River

摘要: 为更好掌握州河水质现状，基于州河流域内2018~2022年白鹤山、舵石盘2个监测断面的逐月水质数据，采用单因子评价法、综合水质标识指数法和主成分分析法，对该流域水质进行评价，单因子评价法表明州河主要限制因子为总磷(TP)和氨氮(NH₃-N)，综合水质标识指数法评价结果表明，州河水质良好，可以达到Ⅱ类水标准，但溶解氧(DO)浓度波动幅度较大。主成分分析也发现州河在冬季和春季水质更差。主成分分析共提取出2个因子，进一步的相关性分析表明DO与水温、COD_Mn存在负相关关系，与NH₃-N、TP、pH存在正相关关系。

Abstract: The water quality of two monitoring sections in the Zhou River basin from 2018 to 2022, including Baihe Mountain and Duoshipan, are evaluated with single factor evaluation method, comprehensive water quality identification index method and principal component analysis to study the water environment of Zhou River basin. The single factor evaluation method can intuitively reveal the main limit factors of the Zhou River are TP and NH₃-N, and the results of the comprehensive water quality identification index method show that the water quality of the state river can reach the type II water standard, while the fluctuation of dissolved oxygen concentration is significant. Using principal component analysis (PCA), five water quality indicators are explained using two principal components, and water quality is comprehensively evaluated. Moreover, correlation analysis shows that there is a negative correlation between DO and COD_Mn, and a positive correlation with NH₃-N and TP.