Surface water quality evaluation method based on combined weight

Abstract

The invention discloses a surface water quality evaluation method based on combined weight, which includes the following steps, firstly selecting water quality indexes to build a water quality evaluation system, then adopting the subjective weighting method, the analytical hierarchy process, the objective weighting method and the super-standard weighted method to obtain three groups of weight vectors of the water quality indexes, and adopting the weight synthesis method based on the ideal point method for weight synthesis, so as to confirm the combined weight of the water quality indexes; taking the water quality indexes as evidences, calculating the basic trust distribution of the evidences to various water quality types, and then performing evidence synthesis based on the evidence additive synthesis rule of the combined weight; and selecting the water quality type with the highest trust degree as the water quality evaluation type as per the evidence synthesis result, and analyzing the variation trend of water quality as per the variation of trust degree of various water quality types. The surface water quality evaluation method provided by the invention integrates the influence of various water quality indexes to determine the water quality type, is objective and reasonable in evaluation results, and can be used for analyzing variation trend of water quality at the same time.

Description

technical field [0001] The invention relates to a water quality evaluation method, in particular to a combined weight-based surface water quality evaluation method. Background technique [0002] Surface water is an important source of domestic water for urban and rural residents, and the safety of surface water quality is related to the development and stability of the entire society. However, with the continuous development of industry and the improvement of people's living standards, the amount of waste discharge continues to increase, and the quality of surface water is threatened by serious pollution. Therefore, scientific and reasonable water quality evaluation methods are needed to evaluate the water pollution status and ensure the water quality safety of drinking water sources. [0003] Traditional surface water quality evaluation methods include single factor evaluation method, water quality index method, fuzzy comprehensive evaluation method, gray system theory met...

AI Technical Summary

Problems solved by technology

However, the single-factor evaluation method judges the overall water quality category based on the worst single index water quality, which has the defect of partial generalization and over-protection problems.

In the water quality index method, the fuzzy comprehensive evaluation method, and the gray system theory method, the weight of each index is usually only determined according to the degree of pollutant exceeding the standard, or determined by expert review, the consideration of factors is not comprehensive, and the weight calculation is not scientific enough.

[0004] In order to evaluate the surface water quality scientifically and rationally, overcome the existing problems in determining the weight of water quality indicators in the traditional evaluation method, and utilize the ambiguity in the comprehensive evaluation of water quality, the present invention proposes a method for evaluating surface water quality based on combined weights

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