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1、第13卷第3期地学前缘(中国地质大学(北京);北京大学)Vol.13No.32006年5月EarthScienceFrontiers(ChinaUniversityofGeosciences,Beijing;PekingUniversity)May2006基于栅格DEM的多流向算法述评11,2111秦承志,朱阿兴,李宝林,裴韬,周成虎11中国科学院地理科学与资源研究所资源与环境信息系统国家重点实验室,北京10010121DepartmentofGeography,UniversityofWisconsin2Madison,Madison,WI53706,
2、USA11,2111QINCheng2zhi,ZHUA2xing,LIBao2lin,PEITao,ZHOUCheng2hu11StateKeyLaboratoryofResourcesandEnvironmentalInformationSystem,InstituteofGeographicalSciencesandNaturalResourcesResearch,CAS,Beijing100101,China21DepartmentofGeography,UniversityofWisconsin2Madison,Madison,WI53706,U
3、SAQINCheng2zhi,ZHUA2xing,LIBao2lin,etal1Reviewofmultipleflowdirectionalgorithmsbasedongriddeddigitalelevationmodels1EarthScienceFrontiers,2006,13(3):0912098Abstract:TheflowdirectionalgorithmbasedongriddedDEMisanimportantcomponentofdigitalterraina2nalysis1Themultipleflowdirectiona
4、lgorithm(MFD)isobviouslybetterthanthesingleflowdirectionalgo2rithm(SFD)whenthespatialpatternofhydrologicalparameters(suchasflowaccumulationandtopographicindex)areneededinmanyresearchareas(e1g1distributedhydrologicmodel,soilerosion)1Basedontheflowpartitioningstrategyadopted,thispa
5、perclassifiesMFDalgorithmsasoffourtypes:(1)MFDwithafixedflowpartitioningexponent;(2)MFDwiththeflowpartitioningexponentvaryingwithpre2computedflowac2cumulation;(3)MFDwiththeflowpartitioningexponentvaryingwithlocaltopographicattribute;and(4)MFDbasedonlocaltopographicform1Thediscuss
6、ionaccordingtotherationalityofmodel,complexityandpracticalityofalgorithm,andsensitivitywiththeerrorsofDEMshowsthattheMFDwiththeflowpartitio2ningexponentvaryingwithlocaltopographicattributeexcelstheotherthreetypesofMFD1Thereisashort2ageofresearchonthequantitativeassessmentofMFDbya
7、rtificialDEM1Thispaperusesanexampletoillus2tratethequantitativeassessmentofMFD,andalsoshowsthattheMFD,withtheflowpartitioningexponentvaryingwithlocaltopographicattribute,producesalowererrorthanotheralgorithms1Intheapplicationsofflowdirectionalgorithms,currentpre2processingmethods
8、fordepressionsandflatareasinDEMaredesign
