总磷控制背景下鄱阳湖五河口水质熵权-TOPSIS模型构建与分析OA

To systematically assess the water quality at the five tributary estuaries of the Poy-ang Lake basin,an entropy weight-TOPSIS model was adopted to conduct comprehensive water quality evaluation of the five major inflowing rivers entering Poyang Lake under the policy constraint of total phosphorus control.The results demonstrated that the entropy weight-TOPSIS model realized objective weight assignment and multi-attribute compre-hensive ranking,which could fully reflect the synergistic effects of various water quality in-dicators and overall pollution status.Evaluation results obtained by this model were highly consistent with those calculated by the Nemerow comprehensive pollution index method.Both methods classified the Xiu River and Gan River as Grade II water bodies and the Rao River,Xin River and Fu River as Grade III water bodies.The overall water quality ranking was determined as Xiu River>Gan River>Rao River>Fu River>Xin River.Spatiotemporal evolution analysis revealed that total nitrogen constituted the primary pollutant,whose annual con-centrations fell within Grade III～V standards and exhibited seasonal fluctuations driven by agricultural non-point source pollution.Annual total phosphorus concentrations remained stable without obvious exceedance of standard limits,verifying the effectiveness of total phosphorus pollution prevention and control policies.The reliability and applicability of the proposed model were further validated through comparative analyses with the single-factor evaluation method and Nemerow comprehensive pollution index method.This study verified the superiority of the entropy weight-TOPSIS model in multi-index comprehensive evalu-ation of complex aquatic environments and the established framework can provide methodo-logical references for water quality assessment and differentiated pollution management of similar river basins.