简介:Localscourmayoccurwhenahydraulicstructureispositionedinachannelwithanerodiblebed.Herewithinvestigatedexperimentallyaretheerosionandflowpatternduetoawaterjetpassingoverachannelbedattheasymptotic(final)state.Thedevelopmentofthescourhole,itsmaximumscourdepthandlength,arerecordedandcomparedwithavailablescour-depthrelations.Twosetsofexperiments(seeTable1)werecarriedout.Set1(3runs)wasconcernedwithmeasuringtheverticalinstantaneousvelocitydistributioninthescourhole.Thescourholeattheasymptotic(final)state,t≈100[h]wasinvestigated.Set2(5runs)wasconcernedwithstudyingthephysicsofscouring.Thescourholeataboutmid-state,t≈0.5[h],wasinvestigated;subsequentlythescour-holedepthwaslinearlyextendedonthesemi-logscaleto72[h];novelocitymeasurementswereperformed.Thepresentdataareputincontextwithsome(popular)existingrelations;recommendedisamodificationofsomeoftheserelations.
简介:这份报纸在一条概念的冲积山谷为各种各样的情形论述模仿的隧道模式由一改善二维(2-D)数学模型在同伴纸描述了。从一样的起始的隧道开始,不同隧道模式为改变的边界和起始的条件在250天的一个实时时期上被模仿了包括入口水分泌物和沉积负担,河岸的起始的山谷斜坡,和erodibility。这些控制因素的影响被讨论,以在概念的河山谷的模仿的河的隧道,隧道十字节的几何学,和水表面侧面的纵的底部侧面。因为二部分的沉积运输条件极大地不同,结果建议一样的隧道的上面、更低的部分可以有不同平面形状。在控制变量和隧道模式之间的模仿的原因的关系与已知的隧道模式理论同意品质上。
简介:Jiaojia-patterngoldminescouldbesurveyedbyutilizinglarge-powerinducedpolarizationsounding.Firstly,amulti-layerednumericalmodelofapolarizationbodywasestablishedinsenseofphysicalandmathematicalderivation.Thepolarizationfieldgeneratedfromthemodelwasthestackofindividualfieldsgeneratedfrommulti-layeredpolarizationunits.Theequationforeliminatingstrongshallowpolarizationanomaliesfromthesoundingdatawasderivedbasedontheprincipleofmultiplyeliminatingthefieldsofindividualpolarizationunits.Asaresult,thedeeppolarizationanomalieswereprominent.Theprocessedsoundingdatawasusedtoquantitativelycalculatethedepthstothetopsofdeepalteredzonesofgoldenmineralization.