River section degradation evaluation method

Abstract

The invention relates to a river section degradation evaluation method, which effectively solves the problems that the evaluation excessively depends on data, the compatibility is complicated and the accuracy and efficiency of the evaluation are affected. The method comprises the following steps: establishing river section degradation evaluation elements and indexes, performing in-situ monitoring, carrying out water quality chemical index analysis and biological authentication for a collected sample, determining a weight of criterion layer evaluation elements for the river degradation by utilizing the level analysis characteristic value method, determining a sub-weight for each representative evaluation index of the criterion layer evaluation elements by utilizing a variance method, and obtaining an absolute weight of each index by considering the weight of the criterion layer evaluation elements; evaluating the river section degradation situation according to each evaluation index absolute weight and a matter-element model, calculating a correlation function and correlation degree, and obtaining the degradation degree of the river section according to the evaluation standard. The method is novel and unique, easy to operate and use, good in effect and capable of accurately evaluating the river section degradation and instructing the river governing and ecological restoration.

Description

technical field [0001] The invention belongs to the field of environmental science, in particular to a method for evaluating river section degradation by using weighting and combining matter element model to evaluate river degradation degree. Background technique [0002] The evaluation of the degree of degradation of river sections is the basic work of river governance and ecological restoration, and there are few methods for evaluating the degree of degradation of river sections. At present, most of them are in river health evaluation. The main methods include comprehensive evaluation index method, set pair method, gray relational degree analysis method, fuzzy comprehensive evaluation method, etc. All of the above methods have advantages and disadvantages, which greatly promote the research progress in this field. Most of the previous studies focused on the evaluation of the river health status in a specific period, but the dynamic changes of the river degradation degree s...

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Problems solved by technology

[0004] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide a river section degradation e

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