简介：Gullysystemsandwatershedsaregeomorphicunitswithclearboundariesthatarerelativelyindependentofbasinlandscapesandplayanimportantroleinnaturalgeography.InordertoexplorethemorphologicalcharacteristicsofgullysystemsandwatershedsintheDry-HotValley[SouthWest(SW)China],gulliesareinterpretedfromonlineGoogleimageswithhighresolutionandwatershedsareextractedfromdigitalelevationmodelatascaleof1:50,000.Theresultsshowthat:(1)Thereare17,382gullies(withatotalareaof1141.66km^2)and42watershedsinthestudyarea.(2)Theaveragegullydensityofthestudyarea(D)is4.29km/km^2,gullyfrequency(F)is14.39gullies/km^2,thebranchingratio(B)is5.13,thelengthratio(L)is3.12,andthecoefficientofthemainandtributarygullies(M)is0,06.Thedegreeofgullyerosionisstrongtoextremelystrong,themaindevelopmentintensityofgullyerosionrangesfromintensetomoderate,andthetypeofgullysystemistributary.(3)Thewatershedareas(A)arebetween0.39and96.43km^2,thereliefratio(R)isfrom0.10to0.19,thecircularityratio(C)isfrom0.30to0.83,thetextureratio(T)isfrom0.82to39.35,andthedominantgeomorphologicaltexturetypeisfine.(4)ThereisaquantitativerelationshipbetweenFandD:F=0.624D2(R=0.84)andTiscloselyrelatedtoD,F,M(R2>0.7).A,RandCarerelatedtoM(R2>0.5).Thedevelopmentofgullysystemsistheresultofcouplingeffectsbetweenmultiplefactors.Inthisarea,thedegreeoferosionandtheconditionofthemainandtributarygulliescanbecontrolledbythedegreeoftopographicbreakageinthewatershed,whichprovidessometheoreticalbasisfortheevaluationofgullyerosionbythelatter.Inaddition,thescale,relief,andshapehaveasignificantimpactonthelocationsofthemainandtributarygullies.Fortributarygullies,attentionshouldbepaidtotheinterceptionandcontrolofrunoffandsedimentinthesmallconfluencebranchesinordertopreventgullyexpansionandheadadvance.Thesefeaturescaninformthedevelopmentoftargetedmea

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