Assessment of water environmental risks from fixed sources in the Yiluo River Basin,Luoyang,China

WANG Li; WANG Han; HAO Songze; WANG Guohao; HUANG Jin; PEI Jie

doi:10.13522/j.cnki.ggps.2024396

Abstract：[Objective]Water pollution incidents pose a serious threat to public drinking water.Assessing watershed water environment risk is necessary to prevent and reduce impact of such incidents.Taking Yiluo River Basin in Luoyang City of Henan Province as an example,this paper proposes a method to assess its environmental risks.[Method]The analysis was based on analytic hierarchy process(AHP).We constructed an environmental risk assessment framework that encompasses three key factors:① intensity of environmental risk sources,② vulnerability of environmental receptors,and ③ capacity for environmental risk prevention,control,and emergency response.From this framework,a water environmental risk assessment was conducted for fixed-source pollution emergencies in the study region.[Result]The highest-risk areas in the basin are in proximity to the river.With the exception of certain counties in the eastern part of the basin,high-risk sectors are chemicals,petroleum,and hazardous material industries.Overall,the basin is in a medium-to-high environmental risk level.Specifically,most counties and districts in the basin are at high risk,except for parts of Luoning County in the west and Xin'an,Mengjin,and Chanhe Huiyuan District in the north,which show comparatively low risk levels.[Conclusion]The dominant environmental risk factors in the basin include the efficiency of emergency command mechanisms,availability of emergency facilities and materials,and proximity to the nearest river.Our findings provide a scientific basis for emergency preparedness and risk management of pollution incidents in the Yiluo River Basin.