A method for synthetically evaluating a river water body

Abstract

A method for synthetically evaluating a river water body includes such steps as establishing three-level index evaluation system, wherein the three-level index evaluation system comprise a first-levelindex, a second-level index and a third-level index, and the three-level index comprises a plurality of grades S2, quantitatively evaluating the degree of black and odor of the river water body by the matter element analysis method, comprising establishing an index evaluation matrix of three indexes, normalizing the index evaluation matrix and the index vector corresponding to the index evaluation matrix, and determining the correlation degree according to the index evaluation matrix and the index vector after the normalizing treatment; step S3, through the hierarchy-Delphi analysis method, determining the weights of the three-level indexes, establishing the expert evaluation matrix by setting the expert evaluation table, calculating the included angles of the evaluation vectors, and correcting the weights by using the normalized consistency of the expert evaluation.

Description

Technical field [0001] The invention relates to the field of environmental protection, in particular to a method for comprehensive evaluation of river water bodies. Background technique [0002] With the rapid development of my country’s economy and the improvement of people’s living standards, urban landscape river water bodies are facing challenges such as industrial wastewater discharge, domestic sewage influx, increased urban non-point source pollution, and loss of ecological functions. Many cities in China are experiencing black river odors. This phenomenon has brought many adverse effects on urban development and the quality of life of residents. In the process of my country's comprehensive deepening of reforms and the start of ecological civilization construction, my country has also begun to carry out comprehensive improvement of urban black and smelly rivers. Based on effective treatment and improvement measures, how to evaluate the effects and long-term effects of urban ...

AI Technical Summary

Problems solved by technology

However, the above methods are not suitable for the evaluation of the black and odor levels of urban rivers: cluster analysis is an exploratory analysis method, which is suitable for data mining; although the canonical correspondence analysis method combines the sample data and environmental factors to analyze the correlation degree, it cannot The original method has the problem of "bow effect"; the Monte Carlo simulation analysis method is a system simulation based on the probability and statistics method, and there is no suitable mathematical probability model for the simulation of urban black and odor problems; the entropy weight comprehensive index method is an index-based The method of modifying the weight of the degree of variation, because the amount of information selected for the selected indicators of urban black and odorous rivers is fixed, the correction effect of this method is not obvious; the calculation of the fuzzy comprehensive evaluation method is more complicated, and there is a problem of low resolution when the number of index sets is large; The gray correlation degree analysis method is mostly used to analyze the influence of different factors on the system over time and the judgment of the correlation degree

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