基于不同降雨频率的地质灾害风险性研究--以乐山市为例.pdfVIP

Abstract

BasedontheGeologicalHazardRiskCensusProjectinLeshanCity,SichuanProvince,

thisstudyconductedacomprehensiveresearchandassessmentofgeologicalhazardsinLeshan

City.Throughdatacollection,remotesensinginterpretationandfieldinvestigation,the

distributioncharacteristics,environmentalbackground,formationconditions,factor

mechanismsandinfluencingfactorsofgeologicaldisastersweresystematicallyexplored.The

mainconclusionsofthestudyareasfollows:

(1)Throughtheselectionofmeteorologicaldataandrainfallmonitoringstations,theCv

valuesofeachmonitoringstationwerecalculatedbyusingtheSichuanProvincialHeavy

RainfallandFloodCalculationManual,andthemaximumdailyrainfallwithdifferent

frequencieswassuccessfullycalculatedbyusingthesynergistickriginginterpolationmethod

inArcGISProsoftware.Itisfoundthattheintensityofitsrainfallisgraduallydecreasingfrom

easttowestandfromsouthtonorth,andmostofthegeohazardhazardsitesarerelatedtothe

jointtriggeringofregionalrainstormsandlocalrainstorms.

(2)Theweightsandcorrelationsoftheinfluencingfactorsoflandslide,avalanche,and

mudslidehazardswereanalysedusingthedeterministiccoefficientmethodandthePearson

correlationcoefficientmethodrespectively.Thefeasibleevaluationfactorindicatorswere

determined,andthespatialdistributionrelationshipbetweentheevaluationfactorsandthe

occurrenceoflandslide,avalancheandmudslidedisasterswasanalysed,andtheevaluation

factorindicatorsystemforlandslide,avalancheandmudslidedisastersinLeshanCitywas

establishedrespectively.ThenthethreecoupledmodelsI-CF,I-LRand