Study On Comprehensive Evaluation Of River Ecological Environment Based On Improved ANP

As an important component of the ecosystem,rivers directly affect the safety of the entire ecological environment and human living environment.This article proposes a research model for river ecological environment evaluation based on ANP to study river ecological environment issues.Taking the Xiangjiang River Basin in Changsha as an example,the river ecological environment evaluation index system is constructed according to the river connectivity,Riparian zone status,water quality status,aquatic organisms,river landscape and management status,and the index weight is calculated by using the network analysis method.On this basis,combined with the River Assessment Model(UPRP)to calculate the environmental comprehensive index,determine the evaluation criteria,and evaluate the ecological environment of the Xiangjiang River Basin in Changsha.The specific research content and results are as follows:(1)The traditional network analysis method is based on a certain criterion,considering the influence relationship between network layer elements.This article does not limit the criterion,and forms factors and clusters based on the control relationship between objects.It analyzes whether the factors within each cluster are independent of each other,as well as whether there are dependency and feedback relationships.(2)In terms of river evaluation,AHP and ANP are relatively widely used.Based on a comparative analysis of existing evaluation models and principles,the basic principles and algorithm steps of ANP are emphasized to reflect their advantages in river ecological environment evaluation.A river evaluation model is constructed by selecting three criteria layers and a total of 18 indicators.By calculating weights through ANP,the results show that the entire river ecological environment can be evaluated mainly from aspects such as water environment and manual maintenance,which are also key factors affecting river ecology.(3)The characteristics and objectives of river ecological environment restoration and the assessment of river ecological environment restoration in the Xiangjiang River basin were compared in Pairwise comparison,and the sub criteria and standards were compared in Pairwise comparison,and the weight value of each standard was determined.The ecological environment comprehensive index of the whole Xiangjiang River obtained an index score of 0.58183.According to the hierarchical interpretation of the UPRP model,Xiangjiang River obtained a B grade: good.This means that the Xiangjiang River is a river with numerous cities along the river,which can accommodate users appropriately,but requires minor improvements.