Abstract
The single-factor evaluation method, improved Nemerow index method, fuzzy mathematical synthesis evaluation method and comprehensive nutrient status index method were used to evaluate the water quality of the Zijiang River in summer, and to analyze the applicability of the evaluation methods. The results show that: (1) The Zijiang River is heavily polluted with nitrogen and TN is the main pollutant in the summer. The overall nutrient status index is 34.33, which is not eutrophic. (2) The single-factor evaluation method is simple and suitable for rapid identification of excessive pollutants, but cannot reflect the water quality. the Nemerow index method takes into account the weight of each evaluation factor in the river water quality, and is suitable for making a comprehensive evaluation of the river water quality, but has a certain degree of subjectivity when classifying the water quality. The fuzzy comprehensive evaluation method is suitable for reflecting the influence of different evaluation factors on water quality by calculating the weight and membership degree of each evaluation factor, but the calculation is complicated.The Integrated Nutrient Status Index method is suitable for determining whether eutrophication is occurring in a water body and cannot determine the water quality category.
Highlights
Comprehensive research and application of water quality evaluation methods at home and abroad, there is currently no unified evaluation method[1].It has been found that there are seasonal characteristics of water quality in rivers and lakes[2,3,4], this paper uses the widely used single-factor evaluation method, improved Nemerow index method, fuzzy mathematical evaluation method, integrated nutrient status index method, four methods to evaluate the water quality of the Zijiang River in summer, and the applicability of the four evaluation methods analysis.2.2 Water samples takenWater withdrawals along the main stem of the Zijiang River from June 27 to July 1, 2019
(2) The single-factor evaluation method is simple and suitable for rapid identification of excessive pollutants, but cannot reflect the water quality. the Nemerow index method takes into account the weight of each evaluation factor in the river water quality, and is suitable for making a comprehensive evaluation of the river water quality, but has a certain degree of subjectivity when classifying the water quality
The fuzzy comprehensive evaluation method is suitable for reflecting the influence of different evaluation factors on water quality by calculating the weight and membership degree of each evaluation factor, but the calculation is complicated.The Integrated Nutrient Status Index method is suitable for determining whether eutrophication is occurring in a water body and cannot determine the water quality category
Summary
Comprehensive research and application of water quality evaluation methods at home and abroad, there is currently no unified evaluation method[1].It has been found that there are seasonal characteristics of water quality in rivers and lakes[2,3,4], this paper uses the widely used single-factor evaluation method, improved Nemerow index method, fuzzy mathematical evaluation method, integrated nutrient status index method, four methods to evaluate the water quality of the Zijiang River in summer, and the applicability of the four evaluation methods analysis
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