陸面過(guò)程中的湖泊和濕地模型及四維資料同化的應(yīng)用.pdf

1、上海大學(xué)碩士學(xué)位論文陸面過(guò)程中的湖泊和濕地模型及四維資料同化的應(yīng)用姓名：顏金鳳申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：流體力學(xué)指導(dǎo)教師：夏南孫菽芬20060301上海大學(xué)碩士學(xué)位論文AbstractLandsurfae圮processesplayallimportantroleinweatherandclimatechangesAtpresenttheinfluenceoflakeandwetlandonlocalclimateandglobalcli

2、matehasbeenrealizedbymoreandmorepeopleBasedontheequationsofwaterandheatbalanceoflakewhichenntainsthewatervaporwedevelopalakemodelandawetlandmodelwhichtaketheconvectivemixingprocessintoconsiderationThelakemodelisvalidated

3、bytheobserveddataofKinneretlakeinthenorthofIsraelandLowerTwoMedicinelakeinMontanastateinAmericaThelatentheatfluxandsensibleheatfluxofdeeplake，shallowlakeandwetlandwithdifferentdepthofwaterbodyarecomputedBycomparisonandan

4、alysisamongthem，conclusionsthattheevaporationisdecreasedbytheincreaseofthedepthofwaterbodyaregotTheinitialtemperaturefieldoflakeisassimilatedbythefourdimensionaldataassimilationmethodofoptimalinterpolationwhichmakesthere

5、sultsmoreclosetotheobservedoneThemainpartofworkconductedbytheauthorisoutlinedasfollowsFirst，basedontheworkofpreviouspeople，alakemodelwhichcontainswaterandheatexchangeandconvectivemixingschemeisdevelopedConvectivemixingme

6、thodisintroducedtocomputeThepresentmodelWasfiguredintheimplicitdifferenceschemeandvalidatedbytheobserveddatafromKJnneretlakeinIsraelAlotofphysicalparametersaretestedtostudytheirinfluenceonlatentheatflux，sensibleheatflux，

7、thetemperatureprofile，andthebalanceofheatandwaterfluxofthelakeSecond，complexsituationoftheexistenceofsnowrainice，watericeliquidwaterisconsideredinthecomputation，theresultsarecomparedwiththeobserveddataofLowerTwoMedicinel

8、akeinAmericaduringwintertimeThebestaccordancewiththedatashowsthatthismethodCandealwiththecomplexsituationwellThirdawetlandmodelthatconsiderswaterbodyandsoilatbottomisdeveloped，convectivemixingschemeisemphasizedinthecompu

9、tationTheinfluenceofthedepthofwaterbodytoevaporationis“analyzed，meanwhile，icingandmeltinginwaterbodyandsoillayeriSconsideredSothiswetlandmodelwhichconsidersthewaterandheattransportationbetweenwetlandandatmospherecanbeuse