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1、WATERRESOURCESRESEARCH,VOL.35,NO.4,PAGES1155±1164,APRIL1999Geographicinformationsystems(GIS)-basedspatiallydistributedmodelforrunoffroutingFranciscoOliveraandDavidMaidmentCenterforResearchinWaterResources,J.J.PickleResearchCampus,UniversityofTexasatAustinAbstract.Amethodispro
2、posedforroutingspatiallydistributedexcessprecipitationoverawatershedtoproducerunoffatitsoutlet.Thelandsurfaceisrepresentedbya(raster)digitalelevationmodelfromwhichthestreamnetworkisderived.Aroutingresponsefunctionisde®nedforeachdigitalelevationmodelcellsothatwatermovementfrom
3、celltocellcanbeconvolvedtogivearesponsefunctionalonga¯owpathandresponsesfromallcellscanbesummedtogivetheoutlethydrograph.AnexampleapplicationofanalysisofrunoffonWallerCreekinAustin,Texas,ispresented.1.Introductionforeachcell,inwhichtheparametersarerelatedto¯owtime(¯owvelocity
4、)andtosheareffects(dispersioncoef®cient)inInrainfall-runoffcomputation,notonlyisthegenerationofthecell.Flowpathresponsefunctions,responsesattheoutletexcessprecipitationspatiallydistributed,butalsotheprecipi-toinstantaneousunitinputsinthecells,arecalculatedbytationitself,which
5、limitstheuseoftheunithydrographmodel.convolvingtheresponsesofthecellslocatedwithinthereach.ThetheorypresentedinthispaperisanattempttogeneralizeThewatershedresponseisobtainedasthesumofthe¯owpaththeunithydrographmethodforrunoffresponseandtodosoresponsestoaspatiallydistributedpr
6、ecipitationexcess.onaspatiallydistributedbasisinwhichtherunoffresponsesfromsubareasofthewatershedareconsideredseparatelyin-steadofbeingspatiallyaveraged.Theneedforscale-2.LiteratureReviewindependent¯owroutingparametersforcalculating¯owtimePilgrim[1976]carriedoutanexperimental
7、studywhichin-(¯owvelocity)andspreadingofamassslugarounditscentroidvolvedtracing¯oodrunofffromspeci®cpointsofa0.39km2becauseofsheareffects(dispersioncoef®cient)ispresentedinwatershed,nearSydney,Australia,andmeasuringthetravelthispaper.Theuseoftheseparametersforbetterestimation
8、oftimeofthelabeledparticlestotheoutlet.Aconclusionofhishydrographsis
