Research On Health Evaluation Of Tangyuan Section Of Tangwang River Based On AHP-Critic Method And Matter-element Extension Mode

With the development of human society,human beings have increased the control and exploitation of rivers.With the deterioration of river water quality and the change of river shape,people realize the importance of river protection and begin to use and protect the river.In accordance with the instructions of the Ministry of Water Resources,Heilongjiang Water Resources and other departments have started to study the river health assessment system since 2019.The research reach of this paper is Tangyuan Section of Tangwang River in Tangyuan County(hereinafter referred to as Tangyuan Section).The main content of this paper includes the establishment of the Tangyuan Section health evaluation system.On the basis of fully investigating the status quo of Tangyuan Section ecological environment and analyzing its change trend,it identifies the influencing factors of Tangwang River health,establishes the evaluation index system covering the riverbank health,water environment,aquatic organisms,and social service function and other comprehensive systems,and then calculates the comprehensive correlation degree of each index.Evaluate the Tangyuan section of Tangwang River in the selected horizontal year.Combining the analytic hierarchy process(AHP)and CRITIC method,the comprehensive weight combining the critic and the principal is calculated to reduce the error of the evaluation results.According to the analysis of correlation degree results,there are 14 indicators in Tangyuan section,among which 7 are very healthy indicators,4 are healthy indicators,2are unhealthy indicators and 1 is bad tide indicator.According to the comprehensive correlation result k=-0.2628,it is concluded that Tangyuan section is in a healthy state.Finally,based on the evaluation results and local conditions,reasonable protection suggestions for corresponding indicators are given to provide ideas for subsequent river restoration.This paper finally solved the problem of constructing the health evaluation system of Tangyuan Section of Tangwang River,calculated the correlation degree of each index of Tangyuan Section combined with the matter-element extension model,identified the influencing factors of Tangyuan Section river health,and put forward the corresponding solutions to these problems.The results of this study provide targeted data support for the solution of actual health problems in Tangyuan Section.