examination of the pasquill gifford turner dispersion 的帕斯奎尔吉福特纳分散检查课件

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1、PerformanceofAirQualityModelsinUrbanAreasObjectivesandMotivationSt.LouisstudyandISCurbanModelImprovementsPerformanceofImprovedModelConclusionsAkulaVenkatram1,VladIsakov2,1UniversityofCalifornia,Riverside,CA2NOAA,NERL,RTP,NCMotivationandObjectivesThemostsevereairpollutionproblemsinAsiaarec

2、ausedbyemissionsinurbanareasExaminetheperformanceofcurrentlyusedurbanairqualitymodels-ISCSuggestimprovementsbasedonrecenttracerstudiesinurbanareasSt.LouisExperimentConductedduring1963-1965resultingin26daytimeand16nighttimeexperimentsCadmiumsulfideparticlesreleasedfromground-levelsourceand

3、measuredatdistancesrangingfrom800mto16kmusing50samplersWinds,temperature,andhorizontalvelocityfluctuationsmeasuredusingTVtowerandtethersondesuptoaheightof140m.Briggs(1974)useddatatoderiveMcElroy-PoolerurbandispersioncurvesusedinISCMcElroy-PoolerCurvesBriggs(1974)HorizontalPlumeSpreadComp

4、arisonSt.LouisExperimentVerticalPlumeSpreadComparisonInferredfromground-levelconcentrationsModelResultsusingstabilityclassesfromLambertAirFieldProblemswithMcElroy-PoolerCurvesUsingMcElroyPoolercurvesrequiresstabilityandwindspeedinformation.Modelresultsdependonlocationofmeasurements.MPcurv

5、esrefertoSt.Louis.Neednotapplytootherurbanareas.MPcurvesimplicitlyaccountfortheeffectsoflimitedmixing.Thus,donotallowtheuseofmixedlayerinformationinurbanareas.ImprovedModelModelResultsusingmeasuredmeteorologyBarrioLoganExperimentConductedduringsummerof2001resultingin50hoursofdataSulfurhex

6、afluoridereleasedfromground-levelsourceandmeasuredatdistancesrangingfrom200mto2kmusing50samplersWinds,temperature,andvelocityfluctuationsmeasuredusingsonicanemometersandminisodarsModelResultsusingBoundaryLayerInformationandInitialSpreadNearSourceModelingModelEvaluationResultsConclusionsTh

7、euseofMcElroy-PoolercurvesinallurbanareascannotbejustifiedTurbulenceabovethecanopycontrolsdispersiononcetheplumespreadexceedscanopyheight.SimplemodelsfordispersionprovideadequateconcentrationestimatesprovidedabovecanopymeteorologyisusedDispersionmodelsshouldaccountf