沉积物水界面通量测定中热脉冲信号分析.pdf

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1、JournalofSoutheastUniversity(EnglishEdition)Vo1．30，No．2，PP．192—196June2014ISSN1003-7985Analysisofheatpulsesignalsdetermination1n0rSec1Il●ment-watAerl■ntJennaCeI●_IUXeSZhuTengyiRajendraPrasadSinghFuDafang(SchoolofCivilEngineering，SoutheastUniversity，Na

2、njing210096，China)Abstract：TI1eheatpulsesignalisanalyzedinanewwaywithbyReneta1．[81tomeasureJ．TheprobeusedbyRenetthegoalsofclarifyingtherelationshipsbetweenthevariablesa1．[81consistedofthreestainlesssteelneedlesembeddedintheheattransferproblemandsimpli

3、fyingtheprocedureforinawaterproofepoxybody．Thecenterneedlecontainedcalculatingsediment—waterinterfacefluxesJ．Onlythreearesistanceheater，andtheoutertwoneedlescontainedparametersx0，Aand(pc)，areneededtocalculateJbythethermocouples．Thisexperimentalsetupis

4、showninFig．heatpulsedataforthisanalysismethod．Theresultsshowthat1．Heattransferawayfromthecentralneedleoccurredviathereisacurvilinearrelationshipbetweenthepeaktemperatureconductionandconvection．Theresultingtemperaturein—arrivaltimeandsedimentwaterinter

5、facefluxes；andtherecreaseatthethermocouplesinthetwoouterneedleswasexistsasimplelinearrelationshipbetweensediment—watermeasuredandrecordedbyanexternaldatalogger．Theinterfacefluxesandthenaturallogoftheratiooftheconvectionofheatbytheflowingwaterresultedi

6、nalar—temperatureincreasedownstreamfromthelineheatsourcetogertemperatureincreasedownstreamfromtheheatsourcethetemperatureincreaseupstreamfromtheheatsource．Thethanups~eamfromtheheatsource．Tu，andHarethesimplicityofthisrelationshipmakestheheatpulsesensor

7、sanups~eamsensor，thedownstreamsensorandtheheater，attractiveoptionformeasuringsoilwaterfluxes．respectively．Keywords：sediment—waterinterfaceflux；seepagemeter；heatpulse；peakarrivaltimedoi：10．3969／{．issn．1003—7985．2014．02．010Dimreecnttm—weaatseurreinmtern

8、ftasceofcwanatebrefrlueaxlizacerdosbsythseespeadgie—meters1-4]．Manyenvironmentalscientistsareinterest．_fuH．。edinunderstandingthemagnitudeanddirectionofsed—iment．waterinterfacefluxJataparticularlocation．Fig．1ConceptualdrawingoftheflowsensorThis