基于县域尺度的宝鸡市地质灾害风险评价

County-scale risk assessment of geological disasters in Baoji City

目的了解宝鸡市地质灾害风险的高低程度,分析宝鸡市地质灾害风险区分布规律,为该地区经济建设提供借鉴。方法以宝鸡市县域单元为研究对象,选取高程等10个指标,运用层次分析法进行危险性评价,选取人口密度等5个指标,运用模糊综合评判法进行易损性评价,进而在危险性评价和易损性评价的基础上,开展基于县域尺度的宝鸡市地质灾害风险评价。结果与结论宝鸡市地质灾害高风险区共798 km^(2)(4.41%),位于金台区、渭滨区南部以及扶风县北部和南部。中风险区共1244 km^(2)(6.87%),主要位于渭滨区和扶风县中部。低风险区共4550 km^(2)(25.11%),主要位于眉县、岐山县、太白县和凤县南部。极低风险区共11525 km^(2)(63.61%),主要分布在陈仓区、陇县、千阳县、麟游县、凤翔区西南部以及凤县和太白县北部。宝鸡市地质灾害中高风险区主要分布在中部和东部地区,西部、南部和北部地区风险较低。该结果可为宝鸡市防灾减灾提供一定参考。

Purposes—To understand the risk degree of geological disasters and provide a reference for the economic construction of Baoji City by analyzing the distribution law of geological hazard risk areas.Methods—With the county units of Baoji City as the research object,the ArcGIS10.2 software is used to conduct hazard evaluation of 10 selected indicators like elevation with analytic hierarchy process,and the fuzzy comprehensive evaluation method is adopted to conduct vulnerability assessment with 5 selected indicators like population density.On the basis of risk assessment and vulnerability assessment,the geological disaster risk assessment of Baoji City is conducted on the basis of county scale.Results and Conclusions—The area with high risk of geological disasters in Baoji City is 798 km^(2)(4.41%),and it is located in Jintai District,the south of Weibin District,the north and south of Fufeng County.The area with medium risk is 1244 km^(2)(6.87%),and it is mainly located in Weibin District and the middle of Fufeng County.The area with low risk is 4550 km^(2)(25.11%),and it is mainly located in Meixian County,Qishan County,Taibai County and the south of Fengxian County.The area with extremely low risk is 11525 km^(2)(63.61%),and it is mainly distributed in Chencang District,Longxian County,Qianyang County,Linyou County,the southwest of Fengxiang District,and the north of Fengxian County and Taibai County.The areas with medium and high risk of geological disasters in Baoji City are mainly distributed in the central and eastern regions,while the risks in the western,southern and northern regions are relatively low.The results can provide some reference for disaster prevention and reduction in Baoji City.