Application of Pollution Index Method Based on Dynamic Combination Weight to Water Quality Evaluation

In view of the shortage of the current single-factor assessment and the common pollution index method, a new water quality comprehensive pollution index method was proposed to achieve the water quality evaluation. The combination of AHP and entropy method is used, and the dynamic adjustment of S type function is used to enlarge the influence of standard exceeded pollutants. It solved the problem that the average pollution index method is too loose and the single factor evaluation method is too strict. The evaluation results were compared with single-factor assessment, average pollution index method and Nemerow index method. We effectively proved the rationality of the evaluation method.