Application of Comprehensive Water Quality Labeling Index Method in Water Quality Evaluation of Xiangjiang River

Assessing water quality stands as a fundamental task in the holistic enhancement of the water environment. Only through precise and scientific evaluations can we formulate effective treatment plans and protective measures aimed at preserving water quality. The conventional singlefactor assessment employs the least favorable indicator among water quality parameters to gauge overall water quality. This approach fails to accurately portray the comprehensive water quality status and its improvements. Therefore, using the Xiangjiang River water quality monitoring data released by the Hunan Provincial Department of Ecology and Environment as the data source, four main indicators including DO, CODMn, NH3N and TP were selected, and the comprehensive water quality labeling index method was used to analyze the Hunan section of the Xiangjiang River. Water quality assessment was conducted on three water quality cross-sections in the upper, middle and lower reaches. The experimental results show that the comprehensive water quality labeling index method not only combines the advantages of the single-factor evaluation method and is capable of qualitative evaluation; it also overcomes the shortcomings of the evaluation method that only selects the worst water quality index as the comprehensive water quality category, which is not comprehensive and objective. It can perform quantitative analysis, reflect the improvement effect of water quality, and can be better suitable for water quality evaluation.