基于dem的陕北黄土高原流域剖面谱-研究

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1、AbstractCatchmentisoneofthebasicgeographicunitsonLoessPlateau．StudyonLoessPlateaucatchmentgeomorphologicalconfigurationisofgreatsignificancetofurtherresearchoncatchmenterosionandconservationofsoilandwateEItisalsoofgreatbenefittotheexplorationoflandformevolution．Topographicprofileisprovedcanb

2、eeffectivelyreflectregionallandformfeature．Previousresearchusing‘CatchmentBoundaryProfileSpectrum’tostudythecharacteroflandform．Ratherthanfocusingonthelocaltopographiccharacters，themethodtakethecatchmentstructureintoaccount，therefore，itcanreflectthelandformfeatureinmacro．scale．Threemainkinds

3、offeatureline，catchmentboundaryline，Loessshoulderline，andvalleyline，existwidelyontheLoessPlateau，China．Theytitleusedtorespectivelydepictinter-gullyareageomorphy,dividedlineofinter-gullyareaandslope—gullyarea，andbottom—gullyareageomorphy．Theinterrelationshipbetweenthesethreefeaturelinescallre

4、flecttheinnercharacteristicsofthecatchment．1iketopographicfeature，erosionfeature，andevolutionfeature．However,previousresearchworksmerelyonusingcatchmentboundaryline，namedCatchmentBoundaryProfileSpectrum(CBPS)，todepictmacrocharacteristicsofloesslandformanditsspatialdistributionpattern．Littlea

5、ttentionispaidonthesyntagmaticrelationofdifferentfeaturelines，anditsroleonterrainanalysis．TheobjectiveofthisresearchistoinvestigatehowtOdealthesethreefeatureline，catchmentboundary,Loessshoulderline，andvalleyline，asawhole，namedCatchmentProfileSpectrum(CPS)，andthenuseittofurtherstudythedrainag

6、eareageomorphologyonLoessPlateau．Primaryworksandcontributionsofthisthesisaresummarizedasfollows：1．ConceptofCatchmentProfileSpectrum(CPS)isgiven．Automaticextractionofthreeloessfeaturelines，catchmentboundaryline，loessshoulderlineandgullyline，iScarriedoutwithDEMdata．Thethreefeaturelineswereinte

7、gratedbasedonfeaturepoints，correspondingsegmentsoflinesbetweenfeaturepointsarethenprojectedtogether．2．Ontilebasisofmorphologicalcharacteristicsandrelationshipofcatchmentprofilelines，quantifiedparametersaboutcatchmentterrainanddevelopmentareconstruc