Method for evaluating water quality

Abstract

The invention provides a method for evaluating water quality, which comprises the following steps: selecting evaluation indexes, and acquiring a historical monitoring value of each evaluation index toconstruct a sample matrix; selecting a quality standard and a standard value, and obtaining a single-factor pollution index of each evaluation index according to a historical monitoring value to construct a pollution index matrix; constructing a projection index function, and adopting an accelerated genetic algorithm to optimize and solve the projection index function to obtain a weight value ofeach evaluation index; carrying out distribution inspection on the single-factor pollution index of each evaluation index to obtain a probability distribution type of each evaluation index; constructing a comprehensive pollution exponential function, and adopting Monte Carlo sampling simulation to obtain a plurality of comprehensive pollution index values; And constructing a cumulative frequency distribution diagram, and comparing the water body quality with the maximum probability as an evaluation result. By implementing the method, the water quality can be objectively and reasonably evaluated by aiming at the defect that the existing comprehensive pollution index water quality evaluation method does not consider the weight of the evaluation index and the uncertainty of the evaluation result.

Description

technical field [0001] The invention relates to the field of environmental science and technology, in particular to a method for evaluating water body quality. Background technique [0002] With the increasing degree of agricultural intensification, the gradual acceleration of urbanization and the rapid development of modern industry, a large amount of untreated industrial, agricultural and domestic sewage enters the water body, leading to the deterioration of water quality and seriously threatening the ecology of the watershed. Health and water supply. According to the "2017 Bulletin on the State of the Ecological Environment in China", 32.1% of the national surface water quality monitoring sections (1940) are at or worse than Class IV water quality standards; 66.6% of the groundwater monitoring points (5100) are at the worse level or Extremely poor. Under the current situation of such serious water pollution problems, it is urgent to effectively carry out comprehensive i...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the embodiments of the present invention is to provide a method for evaluating water body quality, which can objectively and reasonably evaluate the water body quality in view of the existing comprehensive pollution index water quality evaluation method that does not consider the weight of participating indexes and the uncertainty of evaluation results. Evaluate and be able to give the possibility of all results under the uncertain conditions of participating indicators

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