Research on river health assessment based on PSR model and fuzzy AHP comprehensive evaluation model
Taking two main rivers-Zhuxi River and Mi River-in Yanting County,Mianyang City,Sichuan Province as case studies,based on the Pressure-State-Response(PSR)model,this articla constructs a river health evaluation system inclu-ding 6 pressure layer indicators,8 state layer indicators,and 2 response layer indicators,covering humanistic,hydrologi-cal,water quality,biological,and social elements.It identifies the subjective weights of each indicator using the Analytic Hierarchy Process(AHP),and determines the objective weights using the CRITIC method.Based on this,it combines subjective and objective weights to determine the weights of each indicator at each level.Using fuzzy evaluation method,the health status of the rivers is evaluated comprehensively based on the maximum membership principle.The results shows that the weights of the pressure layer,state layer,and response layer are 0.197 8,0.568 1,and 0.234 1,respectively,indica-ting that hydrological and water quality indicators are the main factors affecting river health.The comprehensive scores for the health evaluation of Zhuxi River and Mi River are 84.66 and 85.90,with a sound healthy level,indicating that both rivers generally maintain a healthy status but still have some weaknesses in the humanities and hydrology.
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