河口羽扩展分析以及潮平均混合参数化word格式论文.docx

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河口羽扩展分析以及潮平均混合参数化word格式论文.docx

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河口羽扩展分析以及潮平均混合参数化word格式论文

speed/direction,andtidalrange.Riverdischargecannotonlyprovidebuoyancyflux tostratification,butalsoenhancedtheshearinmixlayer.Enhancedshearovercomes thestratificationindicatingriverflowisoneoftheTKEsource.Ahypothesisis proposedtoexplainthewind-inducedmixingmechanism.Surfacewater is transportedupstreamcasingawind-inducedshearthroughbarotropiceffectbasedon volume conservation.InordertoquantifyTKEproductionbyusingenvironmentalvariablesonly,twoassumptionsareproposed：1.Reducedgravity(stratification)doesn’tdependonthe vertical-mixingcoefficientsandvariesonlywiththeriverflow;2.Verticalsheararecomposedbyalinearcombinationbetweenriverdischarge,tidalrangeandwind causedwind.Onthebasisoftheseobservations,wequantifythecontributionof theseforcingmechanismstotheobservedTKEproductionusinganempirical approachbasedonthemarginalvalueofthedischargeFroudenumber(whichis scaledfromtheenvironmentalvariables)aboveacriticalvalueofone.Theresulting regressionprovidesameansforestimatingTKEproductioninthelift-offzoneasa functionofonlytheenvironmentalvariables,andproducesresultsconsistentwith previous observationsfrom otherturbulence measurementtechniques.The regressionalso providesanindicationoftherelativeimportanceofthevarious forcingmechanisms,andsuggeststhateast(onshore)windsandriverdischargeare themostimportantfactorsincontrollingthevarianceassociatedwithTKE Production, with tidal rangeof lessersignificance.Theresearchresultsoutlinedabovemainlyrevealedeffectsofriverdischarge, tidalrangeandwindonthespreadingandmixingprocessesinahighlystratifiedriver plumewhichprovidesometheoreticalevidencetounderstandtheobservationsand physicallyplausibleinter-tidal mixing parameterizations.Key words：Mid-fieldplume, plumespreading, Near-field plume,Turbulent KineticEnergy production, mixing parameterization目录摘要..........................................................................................................................IAbstract........................................................................