Abstract
In order to select a more suitable water quality evaluation method for Dianchi Lake, the water quality monitoring data of Dianchi Lake were studied. Four water quality detection indicators, namely dissolved oxygen, high acid salt index, ammonia nitrogen and total phosphorus, were selected as evaluation indicators. Three common water quality evaluation methods based on single factor analysis, principal component analysis and grey correlation analysis were studied in detail. The annual average detection data values of ten water quality monitoring points deployed in Dianchi Lake from 2019 to 2021 were selected, According to the national surface water evaluation standard, the water quality grade is evaluated and compared. The three methods have their own evaluation emphases, and the grey correlation analysis method is closer to the publicized water quality grade, which is more suitable for the water quality evaluation of Dianchi Lake, and can provide decision support for water environment treatment.
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