【英文标准名称】:StandardTestMethod(AnalyticalProcedure)forDeterminingTransmissivityofNonleakyConfinedAquifersbyOverdampedWellResponsetoInstantaneousChangeinHead(SlugTests)
【原文标准名称】:顶部瞬时变化的强衰减井响应法测定非渗漏承压含水层的传输率的标准试验方法(分析法)
【标准号】:ASTMD4104-1996(2010)e1
【标准状态】:现行
【国别】:美国
【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(US-ASTM)
【起草单位】:D18.21
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:aquifers;aquifertests;controlwells;groundwater;hydraulicconductivity;observationwells;storagecoefficientstorativity;transmissivity;Controlwells;Aquifers;Fieldtesting--groundwater/aquifers;Groundwater;Hydraulicconductivity/tra
【摘要】:AssumptionsofSolutionofCooperetal(1):Theheadchangeinthecontrolwellisinstantaneousattimet=0.Wellisoffinitediameterandfullypenetratestheaquifer.Flowinthenonleakyaquiferisradial.ImplicationsofAssumptions:Themathematicalequationsappliedignoreinertialeffectsandassumethewaterlevelreturnsthestaticlevelinanapproximateexponentialmanner.ThegeometricconfigurationofthewellandaquiferareshowninFig.1.Assumptionsareapplicabletoartesianorconfinedconditionsandfullypenetratingwells.However,thistestmethodiscommonlyappliedtopartiallypenetratingwellsandinunconfinedaquiferswhereitmayprovideestimatesofhydraulicconductivityfortheaquiferintervaladjacenttotheopenintervalofthewellifthehorizontalhydraulicconductivityissignificantlygreaterthantheverticalhydraulicconductivity.AspointedoutbyCooperetal(1)thedeterminationofstoragecoefficientbythistestmethodhasquestionablereliabilitybecauseofthesimilarshapeofthecurves,whereas,thedeterminationoftransmissivityisnotassensitivetochoosingthecorrectcurve.However,thecurveselectedshouldnotimplyastoragecoefficientunrealisticallylargeorsmall.1.1Thistestmethodcoversthedeterminationoftransmissivityfromthemeasurementofforce-free(overdamped)responseofawell-aquifersystemtoasuddenchangeofwaterlevelinawell.Force-freeresponseofwaterlevelinawelltoasuddenchangeinwaterlevelischaracterizedbyrecoverytoinitialwaterlevelinanapproximateexponentialmannerwithnegligibleinertialeffects.1.2TheanalyticalprocedureinthistestmethodisusedinconjunctionwiththefieldprocedureinTestMethodD4044forcollectionoftestdata.1.3Limitations8212;Slugtestsareconsideredtoprovideanestimateoftransmissivity.Althoughtheassumptionsofthistestmethodprescribeafullypenetratingwell(awellopenthroughthefullthicknessoftheaquifer),theslugtestmethodiscommonlyconductedusingapartiallypenetratingwell.Suchapracticemaybeacceptableforapplicationunderconditionsinwhichtheaquiferisstratifiedandhorizontalhydraulicconductivityismuchgreaterthanverticalhydraulicconductivity.Insuchacasethetestwouldbeconsideredtoberepresentativeoftheaveragehydraulicconductivityoftheportionoftheaquiferadjacenttotheopenintervalofthewell.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:P13
【国际标准分类号】:13_060_10
【页数】:4P.;A4
【正文语种】:英语