對流邊界層光學(xué)湍流的特征分析.pdf

1、中國科學(xué)技術(shù)大學(xué)碩士學(xué)位論文對流邊界層光學(xué)湍流的特征分析姓名：盧超申請學(xué)位級別：碩士專業(yè)：大氣物理學(xué)與大氣環(huán)境指導(dǎo)教師：袁仁民20100401AbstractABSTRACTTheboundarylayerisveryimportanttohumanactivityasthetransitionzonebetweenthesurfaceandfreeatmosphereTurbulencestructureoftheboundaryla

2、yerespeciallytheentrainmentlayerisanimportantaspectfortheboundarylayerresearch，whichisveryimportanttoimproveunderstandingoftheboundarylayerandtheresearchoftheboundarylayerparameterizationFieldobservationsandcomputersimul

3、ationarecommonmeansforboundarylayerresearchHowever’afieldobservationcostsmuchmoneyandhaspoorrepeatabilityTheresultsofthenumericalsimulationneedverificationwiththeobservationdataOnthecontrarylaboratorysimulationexperiment

4、isagoodapproachduetoitssteadiness，repeatabilityandeasilytocarryoutGenerationandevolutionoftheatmosphericconvectivelayerweresimulatedinlaboratoryconvectivewatertankwiththedimensionof150cm150cmX60cmWhenthecollisionlightbea

5、mpropagatedthroughthesimulatedatmosphericconvectiveboundarylayerfaculaimagedatacouldbeobtainedBasedonspectralanalysistofaculaimagedata，resultscanbegivenasfollows(1)Basedonthetheoryoflightwavepropagationinturbulentmediath

6、escalingexponentscouldbegivenbythemethodofdeterminingdimensionlessinterzoneItwasfoundthatundertheconditionofthehomogeneouslandsurface，thescalingexponentsinthemixedlayerwere一8／3whichwastheclassicvalueofthehomogeneousturbu

7、lence，butnotonthenonuniformsurfacewhichmeanedthatthescalingexponentswereinfluencedbyNonuniformityInentrainmentlayer，whetherhomogeneouslandsurfaceornon—uniformsurface，thescalingexponentshighlydepartedfrom8／3inthebeginning

8、ofexperimentsandintheendtheywerealsocloseto8／3whichindicatedthatintheendofexpefimententrainmentzoneWasalsohomogeneousbecauseoftheviolencersurfaceheatingandweakerinversiononthetopoftheboundarylayerTheaveragescalingexponen

9、tsintheentrainmentzonehadsomerelationshipswiththeconvectiveRichardsonnumberandtheresultWasdifferentontheconditionofhomogeneouslandsurfaceandnon—unifomsurfaceItcouldalsobefoundthatthecharacteristicsofthescalingexponentpro