祁連山北部地區(qū)侵蝕速率與地貌演化研究.pdf

1、蘭州大學(xué)碩士學(xué)位論文祁連山北部地區(qū)侵蝕速率與地貌演化研究姓名：孫然好申請學(xué)位級別：碩士專業(yè)：自然地理學(xué)指導(dǎo)教師：潘保田20050501!!堡坐!!型些墾堡些望蘭蘭墊塾塑些竺塑壘!堅!壘塑AbstractThediscusstionoftectonicupliftandclimatechangeisoneofthehotissuesinthegeoscieneefiledRecentstudiesproposethattheclimate

2、changescontroltheerosionrateandconsequentlycontroltheupliftofthelithosphere，whichchallengethetmditionalmodelThetectonicupliftofthenortheasternflankof也eQilianMountains，whichaffectedbythenorthwardoftheIndiaplate，isstrongly

3、duringtheCenozoniceraInvestigationontheerosionrateofthenortheastemflankoftheQilianMountainsisofgreatimportancetounderstandthedrivingforceandhistoryofgeomorphologyevolutionHerewestudytheerosionrateofnorthernpartoftheQilia

4、nMountainsduringthepast50yearstorevealthedrivingforceandgeomorphologyevolutionoftheQilianMountainsTheerosionrateofnorthernpartoftheQilianMountainswascalculatedfirstlyonthebasisofthefiverloaddatacollectedIntergratedthemet

5、erologicalandhydrologicaldatainthepast50years，wegettheparametersandanalyzethemtodiscussthefactorswhichcontroltheerosionrateMoreovertheprinciplecomponentanalysisandgraycorrelationanalysiswereappliedtoselectthemostimportan

6、tfactors血ata目Fect也eerosionrateOurinvestigationdrawssomeconclusionsasfollows：(1)CalculatederosionratesofQilianMountainswiththesuspended，bedandsolventloadsofthemodemriversoverthepast50yearsarebetween009031mm／aAsawhole，thee

7、rosionratesofChangmaRiverandHeiheRivercatchment，whichlocatedatthewestemQilianMountains，aregreaterthanthatoftheShiyangRivercatchment，whichlocatedattheeasternQilianMountainsTheerosionratedecreasedfromtheuppertolowbranchofe

8、verycatchment(2)ThegeomorphicinformationentropyandStrahlerintegralwascalculatedbystlldytheparametersgetfromthe1：250。000DEMofQilianmountainsAnalysisoftheregionalgeomorphologycharactersindicatesthattheresearchareasareunder

9、goingatransitionfromoldstagetoyouthstageofDavisiangeomorphologicevolutionstages(3)Processingwithkriginginterpolationmethod，climateandhydrologicaldataareanalyzedasthepotentialinfluencefactorsoferosionratestogetherwiththeg

10、eomorphicfactorsThroughthemethodofprincipalcomponentanalysis，wedividesflffheneefactorsintofourgroups，namely‘topographicrelieffactors”，“catchmentbasinshapefactors”，“temperaturefactorsofcatchments”，‘‘precipitationandsurfac