【英文标准名称】:StandardTestMethodforDeterminingTransmissivityandStorageCoefficientofBounded,Nonleaky,ConfinedAquifers
【原文标准名称】:测定有限的,非越流性,封闭含水层透射率和蓄水系数的标准试验方法
【标准号】:ASTMD5270-1996(2002)
【标准状态】:现行
【国别】:
【发布日期】:1996
【实施或试行日期】:
【发布单位】:美国材料与试验协会(ASTM)
【起草单位】:D18.21
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:储存;渗透率;地下水;水常规;试验
【英文主题词】:
【摘要】:Assumptions:5.1.1Thewelldischargesataconstantrate.5.1.2Wellisofinfinitesimaldiameterandisopenthroughthefullthicknessoftheaquifer.5.1.3Thenonleakyconfinedaquiferishomogeneous,isotropic,andareallyextensiveexceptwherelimitedbylinearboundaries.5.1.4Dischargefromthewellisderivedinitiallyfromstorageintheaquifer;later,movementofwatermaybeinducedfromaconstant-headboundaryintotheaquifer.5.1.5ThegeometryoftheassumedaquiferandwellareshowninFig.1orFig.2.5.1.6Boundariesareverticalplanes,infiniteinlengththatfullypenetratetheaquifer.Nowaterisyieldedtotheaquiferbyimpermeableboundaries,whereasrechargingboundariesareinperfecthydraulicconnectionwiththeaquifer.5.1.7Observationwellsrepresenttheheadintheaquifer;thatis,theeffectsofwellborestorageintheobservationwellsarenegligible.ImplicationsofAssumptions:5.2.1Implicitintheassumptionsaretheconditionsofafully-penetratingcontrolwellandobservationwellsofinfinitesimaldiameterinaconfinedaquifer.Undercertainconditions,aquifertestscanbesuccessfullyanalyzedwhenthecontrolwellisopentoonlypartoftheaquiferorcontainsasignificantvolumeofwaterorwhenthetestisconductedinanunconfinedaquifer.TheseconditionsarediscussedinmoredetailinTestMethodD4105.5.2.2Incasesinwhichthistestmethodisusedtolocateanunknownboundary,aminimumofthreeobservationwellsisneeded.Ifonlytwoobservationwellsareavailable,twopossiblelocationsoftheboundaryaredefined,andifonlyoneobservationwellisused,acircledescribingallpossiblelocationsoftheimagewellisdefined.5.2.3Theeffectsofaconstant-headboundaryareoftenindistinguishablefromtheeffectsofaleaky,confinedaquifer.Therefore,caremustbetakentoensurethatacorrectconceptualmodelofthesystemhasbeencreatedpriortoanalyzingthetest.SeeGuideD4043.1.1Thistestmethodcoversananalyticalprocedurefordeterminingthetransmissivity,storagecoefficient,andpossiblelocationofboundariesforaconfinedaquiferwithalinearboundary.Thistestmethodisusedtoanalyzewater-levelorheaddatafromoneormoreobservationwellsorpiezometersduringthepumpingofwaterfromacontrolwellataconstantrate.Thistestmethodalsoappliestoflowingartesianwellsdischargingataconstantrate.Withappropriatechangesinsign,thistestmethodalsocanbeusedtoanalyzetheeffectsofinjectingwaterintoacontrolwellataconstantrate.1.2TheanalyticalprocedureinthistestmethodisusedinconjunctionwiththefieldprocedureinTestMethodD4050.1.3Limitations8212;ThevaliduseofthistestmethodislimitedtodeterminationoftransmissivitiesandstoragecoefficientsforaquifersinhydrogeologicsettingswithreasonablecorrespondencetotheassumptionsoftheTheisnonequilibriummethod(seeTestMethodD4106)(see5.1),exceptthattheaquiferislimitedinarealextentbyalinearboundarythatfullypenetratestheaquifer.Theboundaryisassumedtobeeitheraconstant-headboundary(equivalenttoastreamorlakethathydraulicallyfullypenetratestheaquifer)orano-flow(impermeable)boundary(equivalenttoacontactwithasignificantlylesspermeablerockunit).TheTheisnonequilibriummethodisdescribedinTestMethodsD4105andD4106.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.1.5Thi......
【中国标准分类号】:P13
【国际标准分类号】:13_060_10
【页数】:7P.;A4
【正文语种】: