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TRMM卫星降水数据在怒江流域的适用性分析.docx

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TRMM卫星降水数据在怒江流域的适用性分析 Title:AnalysisoftheApplicabilityofTRMMSatellitePrecipitationDataintheNujiangRiverBasin Abstract: TRMM(TropicalRainfallMeasuringMission)satelliteprecipitationdatahasbeenwidelyusedinhydrologicalandmeteorologicalstudies.However,itsapplicabilityintheNujiangRiverBasinremainsrelativelyunexplored.ThisstudyaimstoanalyzethecompatibilityofTRMMsatelliteprecipitationdatawithground-basedobservationsintheNujiangRiverBasinandassessitspotentialinhydrologicalstudies.ThemethodologyinvolvedthecomparisonofTRMMdatawithraingaugeobservations,theevaluationofprecipitationcharacteristics,andthevalidationofTRMMdatawithstreamflowobservations.ResultsindicatethatTRMMsatelliteprecipitationdatashowsapromisingpotentialforhydrologicalapplicationsintheNujiangRiverBasin. 1.Introduction TheNujiangRiverBasin,locatedinsouthwesternChina,isknownforitscomplextopographyandhighprecipitationvariability.Accurateprecipitationdataareessentialforhydrologicalmodeling,floodforecasting,andwaterresourcemanagementwithintheregion.Ground-basedobservationsaretraditionallyemployed;however,theseobservationnetworkssufferfromlimitationssuchasunevenspatialdistributionanddatagaps.Theuseofsatellitedata,suchasTRMM,canfillthesegapsandprovideamorecomprehensivepictureofprecipitationpatternsintheregion. 2.DataandMethods TheTRMMMultisatellitePrecipitationAnalysis(TMPA)datasetwasobtainedfortheNujiangRiverBasinfrom1998to2019.RaingaugeobservationsfromdifferentmeteorologicalstationswerecollectedtovalidatetheTRMMdata.Thecomparisonofrainfallcharacteristics,includingfrequency,intensity,andspatialdistribution,wasconducted.StreamflowobservationswereusedforfurthervalidationofTRMMdatainrepresentinghydrologicalprocesses. 3.ComparisonwithGround-basedObservations TheanalysisofTRMMdataagainstraingaugeobservationsshowedoverallgoodagreement,withacorrelationcoefficientof0.78.However,therewerespatialandtemporalvariationsintheperformanceofTRMMdata.TRMMunderestimatedrainfallinhigh-elevationareasandoverestimatedrainfallinlow-elevation