ASTM D5719-1995(2006) 用地下水流动模型代码模拟地下空气流动标准导则

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【英文标准名称】:StandardGuideforSimulationofSubsurfaceAirflowUsingGround-WaterFlowModelingCodes
【原文标准名称】:用地下水流动模型代码模拟地下空气流动标准导则
【标准号】:ASTMD5719-1995(2006)
【标准状态】:现行
【国别】:
【发布日期】:1995
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D18.21
【标准类型】:(Guide)
【标准水平】:()
【中文主题词】:空气流动;模型;指南;地下水;地下用;水流模式代码;水流模式代码;水类型;计算机类型;地下的;模式;土壤消除;土中空气流动;模拟
【英文主题词】:airflow;computermodel;groundwater;simulation;soilventing
【摘要】:Theuseofvaporextractionsystems(VES),alsocalledsoilvaporextraction(SVE)orventingsystems,isbecomingacommonremedialtechnologyapplicabletositescontaminatedwithvolatilecompounds(3,4).Avaporextractionsystemiscomposedofwellsortrenchesscreenedwithinthevadosezone.Airisextractedfromthesewellstoremoveorganiccompoundsthatreadilypartitionbetweensolidorliquidphasesintothegasphase.Thevolatilecontaminantsareremovedinthegasphaseandtreatedordischargedtotheatmosphere.Inmanycases,thevaporextractionsystemalsoincorporateswellsopentotheatmospherethatactasairinjectionwells.Note18212;Fewmodelcodesareavailablethatallowsimulationofthemovementofair,water,andnonaqueousliquidsthroughthesubsurface.Thosemodelcodesthatareavailable(5,6),requireinordinatecomputehardware,arecomplicatedtouse,andrequirecollectionoffielddatathatmaybedifficultorexpensivetoobtain.Inthefuture,ascomputercapabilitiesexpand,thismaynotbeasignificantproblem.Today,however,thesecomplexmodelsarenotappliedroutinelytothedesignofvaporextractionsystems.Thisguidepresentsapproximatemethodstoefficientlysimulatethemovementofairthroughthevadosezone.Thesemethodsneglectthepresenceofwaterandotherliquidsinthevadosezone;however,thesetechniquesaremucheasiertoapplyandrequiresignificantlylesscomputerhardwarethanmorerobustnumericalmodels.Thisguideshouldbeusedbyground-watermodelerstoapproximatelysimulatethemovementofairinthevadosezone.Useofthisguidetosimulatesubsurfaceairmovementdoesnotguaranteethattheairflowmodelisvalid.Thisguidesimplydescribesmathematicaltechniquesforsimulatingsubsurfaceairmovementwithground-watermodelingcodes.Aswithanymodelingstudy,themodelermusthaveathoroughunderstandingofsiteconditionswithsupportingdatainordertoproperlyapplythetechniquespresentedinthisguide.1.1Thisguidecoverstheuseofaground-waterflowmodelingcodetosimulatethemovementofairinthesubsurface.Thisapproximationispossiblebecausetheformoftheground-waterflowequationsaresimilarinformtoairflowequations.Approximatemethodsarepresentedthatallowthevariablesintheairflowequationstobereplacedwithequivalenttermsintheground-waterflowequations.Themodeloutputisthentransformedbacktoairflowterms.1.2Thisguideillustratesthemajorstepstotakeindevelopinganairflowmodelusinganexistingground-waterflowmodelingcode.Thisguidedoesnotrecommendtheuseofaparticularmodelcode.Mostground-waterflowmodelingcodescanbeutilized,becausethetechniquesdescribedinthisguiderequiremodificationtomodelinputandnottothecode.1.3Thisguideisnotintendedtobeallinclusive.Othersimilartechniquesmaybeapplicabletoairflowmodeling,aswellasmorecomplexvariablysaturatedground-waterflowmodelingcodes.Thisguidedoesnotprecludetheuseofothertechniques,butpresentstechniquesthatcanbeeasilyappliedusingexistingground-waterflowmodelingcodes.1.4Thisguideisoneofaseriesofstandardsonground-watermodelapplications,includingGuidesD5447andD5490.ThisguideshouldbeusedinconjunctionwithGuideD5447.Otherstandardshavebeenpreparedonenvironmentalmodeling,suchasPracticeE978.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisst......
【中国标准分类号】:P13
【国际标准分类号】:13_060_10;13_080_01
【页数】:5P.;A4
【正文语种】: