2003年7月3～4日淮河流域暴雨過程的觀測與模擬分析.pdf

1、南京信息工程大學碩士學位論文2003年7月3～4日淮河流域暴雨過程的觀測與模擬分析姓名：鄭秀云申請學位級別：碩士專業(yè)：氣象學指導教師：何金海王建捷20050501AbstractConventionalandhighresolutionobservationdatasuchassatelliteradarandtheSurfaceAutomaticStationdataareusedtoanalysisthedevelopmentCha

2、racteristicsofMCSsAssociatedwithrainmassactivityforanheavyrainfalloverHuaiheValleyduring34July2003.Theresultsshowedthatthedevelopmentofmesopscaleconvectivesysteminmeiyufrontmesoascalecloudsystemwasthedirectreasonofheavyr

3、ainfallbythefavourablebackgroundoflargescalecirculation.Thestrengthandlocationsofheavyrainfallwerecloselyrelatedwiththeactivityofmesopscaledisturbances.Therewerethreerainmassactiveperiodscorrespondingtothreepeakvalueofra

4、infallintensitywithinthewholeprocessandtheirlifetimeweredissimilar.Thefastandthethirdrainmassactivityarecausedbythecontinuousafectsofsomemassivedispersivemesopscaleconvectivecomplexandthatthesecondrainmassactivitywasrela

5、tedtotherapiddevelopmentofabout100kmlongmesopscaleconvergencezonenearthesurface.Thelifetimeofmeso日scaleconvectivecloudclustermaynotbethesameasrainmass.Onelivingprocessmaybecorrespondingtoeitheronemeso(3scaleconvectiveclo

6、udclusteractivityormultipleactivities.Thedominantefectsofheavyrainfalleventsaretheconvectivecomplexandsomestrongconvectivemonomerwhichechoeswerefrom40to60dBZ.Theechointensitiesanddevelopmentalheighthadpositivecorrelation

7、totheintensityofsurfaceprecipitation.ThennumericalsimulationismadeontheheavyhardrainfalloverHuaiheValleyusingthePSUNCARMM5model.WefindthattheMM5modeldoquitewellinsimulatingandcouldprovidethehighresolutiondatatodiagnose.M

8、esoascaleandMesopscaleabout100kmlongconvectivesystemscanbereflected勿theMM5model.Butthemodelhaslimitofmesop(Y)scalewhichhavesmallscaleandstrongdevelopment.Finallythatthedirectreasonofthesecondrainmassactivityistherapiddev

9、elopmentofabout1001QnlongmesooscaleconvergencezonenearthesurfaceisvalidatedbythehighresolutiondataprovidedbytheMM5model.themechanismandstructureofmesoscalesystemsarestudiedbyconductingdiagnosticanalysistheoryofdynamicsan