简介:WatertankexperimentswerecarriedouttoinvestigatethethermalconvectionduetothebottomheatinginanasymmetricalvalleyunderneutralandstablystratifiedapproachflowswiththeParticleImageVelometry(PIV)visualizationtechnique.Intheneutralstratificationapproachflow,theascendingdraftinducedbybottomheatingismainlylocatedinthecenterofthevalleyincalmambientwind.However,withambientwindflow,thethermalconvectionisshiftedleeward,andthedescendingdraftislocatedontheleewardsideofthevalley,whiletheascendingdraftislocatedonthewindwardside.Thedescendingdraftisminorlyturbulentandorganized,whiletheascendingdraftishighlyturbulent.Withtheincreaseofthetowingspeed,thedescendingandascendingdraftsinducedbythemechanicalelevationbegintoplayamoredominantroleinthevalleyflow,whiletheroleofthethermalconvectioninthevalleyairflowbecomeslimited.Inthestablestratificationapproachflow,thethermalconvectionislimitedbythestablestratificationandnodistinctcirculationisformedincalmambientwind.Withambientwind,agravitywaveappearsintheupperlayerinthevalley.Withtheincreaseoftheambientwindspeed,agravitywaveplaysanimportantroleinthevalleyflow,andthelocationandintensityofthethermalconvectionarealsomodulatedbythegravityinternalwaves.Thethermalconvectionhasdifficultypenetratingtheupperstablelayer.Itsexchangeislimitedbetweentheairintheupperlayerandthatinthelowerlayerinthevalley,anditisadversetothediffusionofpollutantsinthevalley.
简介:从2003年开始,我院博士后科研工作站正式招收博士后研究人员。通过我院学位评定委员会会议对申请进站人员的个人材料进行审议,同意8名博士生进入我院科研工作站从事博士后研究工作。目前已有5名博士后研究人员正式进站工作。为充分发挥博士后研究人员在站期间的创造力,我院为他们提