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1、RiskAssessmentofDebrisFlowBasedonGISZegenWangSchoolofCivilEngineeringandArchitecture,SouthwestPetroleumUniversity,China610500;e-mail:zegen01@126.comZhengchaoSunSchoolofCivilEngineeringandArchitecture,SouthwestPetroleumUniversity,China610500;e-mail:958079
2、706@qq.comABSTRACTDebrisflowsisoneofthemostseriousgeologicaldisastersinourcountry,andpre-disasterriskassessmentthatshouldbecarriedouteffectivelyisanimportantguaranteeforthesafetyoflifeandproperty.ThispaperproposestoconductdebrisflowriskassessmentusingGIS
3、basedontheanalysisofthelackoftraditionaldebrisflowriskassessment.TakingDujiangyanCity,SichuanProvinceasthestudyareaandDEM,remotesensingimagesandotherinformationasbasicinformation,thisarticleaimstoexploreofGISintheapplicationofriskassessmentofdebrisflowme
4、thod,launchinghazardandvulnerabilityAssessment,indexclassificationandassignment,spacecalculationandoverlayanalysis.KEYWORDS:Debrisflows;hazard;vulnerability;risk;GISINTRODUCTIONDebrisflowisaphenomenonofabruptnaturaldisastersinthemountains.Itaffectssocial
5、lifeandeconomicsustainabledevelopmentseriously,duetoitscharacteristicsofasudden,short-lived,ferocious,extremelydestructive[InstituteofMountainHazardsandEnvironment,CAS,2000].Atthisstageitisdifficulttoavoidthedebrisflowdisastercase,soitbecomesparticularly
6、importanttoexecuteriskassessmentfordebrisflow[Liu,G.X.,2012].Thetraditionalmethodsofdebrisflowriskassessmentmainlyincludegeologicalmapping,fieldexploration,indoorandoutdoorexperiments[Domenicc,T.andLaura,T.,2004].Thereareinadequaciesasfollows.(1)Traditio
7、nalriskassessment,simplyexpressinganddescribingriskinwordsornumbers,cannoteffectivelyexpressthespatialdistributionofrisk.(2)Theevaluatedresultsoftendisplayavalueinanareaoravalley,anditisdifficulttodistinguishthedifferencesandrefinementrequirementsofriski
8、nthedifferentspatialpositions.(3)Evaluationresultsarenotreliablebecauseoftheinterferenceofhumanfactorsintheevaluationprocess.(4)Furtherworkmusttobedoneifwemakeevaluationresultsdirectlyusedforriskmanagementanddecision-makin
