30422.基于gis的白龍江流域泥石流危險性評價研究

1、蘭州大學碩士學位論文基于GIS的白龍江流域泥石流危險性評價研究姓名：韓金華申請學位級別：碩士專業(yè)：地圖學與地理信息系統(tǒng)指導教師：馬金輝20100501AbstractBailongjiangBasininLongnanregionsofGansuProvinceisamajordisasterareaTheterraininregionisverycomplex，hillyditchinsuranceanddebrisflowiswel

2、ldevelopedDebrisflowcausessignificantlossestothelocalareas，severelyaffectedthelocaleconomicdevelopmentandmountainareaconstructionTheearthquakeinWenchuanhasseriouslyunderminedthestabilityofthemountain，therefore，itisnecess

3、arytoestablishdebrisflowriskassessmentsystemaftertheearthquake，andmakemoreeffectivemeasuresteducetheharmcausedbydebrisflowFromthetwosidesthattheinnergeologicalenvironmentandexternaldynamicenvironmentimpactdebrisflowactiv

4、ityindepthanalysisofthevariousfactorsimpactingdebrisflowactivityandfullytakingintoaccountpotentialmaterialsource—lithologytheexistingsourcematerial—landslideofthedebrisflowactivities，debrisflowriskassessmentsystemincludi

5、ng11factorsisestablished。Thedivisioniscarriedoutrespectivelyonthedebrisflowriskdegreeinthegridandthewatershedasaunit，andthefollowingunderstandinghasbeenmade：1Theimpactofdebrisflowonthelocalareas：First，endangeringtownsand

6、villages；Second，endangeringagriculturalproduction，suchasburingland，hazardingfarmland，destroyingagricultureandwaterconservancyfacilities；Third，damagingtransportion，causinghinderanddamageoftheroads；Fourth，riverhazards，such

7、asblockingrivers，siltinguptheriversandreservoirsandSOon2Basedonpreviousresearchandfieldstudies，161debrisflowditchesinthestudyareaatotaldrainageareaofmorethan1Km2aredetermined4969percentofthedebrisflowditchdrainageareasar

8、ebelow3Km2，mainlyintheBailongiiangsidesofWudu，andtheoutbreakfrequencyofdebrisflowishigh3TherainfallofdifferentdurationshasdifferenteffectsondebrisflowactivityThesensitivityanalysisondebrisflowactivitywiththerainfallofdif