简介：Theriversystemsobservedtodayisthecumulativeresultofsurface,rill,andgullyerosion,andsedimenttransport,scour,anddeposition.Thedivisionsofapproachbetweenthesetworelatedareasareman-made,andarenotbasedonsoundscience.Mostoftheerosionstudiesaredonebygeologistsandagriculturalengineerswhoareconcernedofthesurface,rill,andgullyerosionandthelossofagriculturallandproductivity.Hydraulicengineersaremoreinterestedinthestudyofsedimenttransport,scour,anddeposition,andtheirimpactsonriverengineeringandhydraulicstructuresinriversandreservoirs.Erosionstudiesareoftenbasedonempiricalrelationshipsorfielddatatodeterminatetheannualsedimentyieldfromawatershed.Ontheotherhand,hydraulicengineersfocustheirattentiononsolvingequationsbasedonassumedinitialandboundaryconditionswithatimescaleofdays,hours,orseconds.Bothapproacheshavetheircomplementarystrengthsandweaknesses.Itisimportanttoprovideaforumforspecialistsinbothareastocommunicate,exchangeideas,andlearnfromeachother.

简介：Reliablequantitativeestimationofbedaggradationordegradationisimportantforriver-trainingandwatermanagementprojects.Withthedevelopmentofwaterresources,sedimentproblemsassociatedwithadamarebecomingmoresevere.Thispaperdescribessomespecialproblemsinmathematicalmodelforcalculationofdegradationandaggradationinareservoir.Themaineffortsofthisstudyareonthetreatmentofsomephysicalprocessesoffinesedimenttransport(＜0.05mm).Problemsinareservoirareobviouslydifferentfromanaturalstream,suchastheturbidcurrentflow,orificesedimentflushing;andtheinitiationandconsolidationofcohesivesedimentdeposition.ThecaseofLiujiaxiaReservoir,whichislocatedintheupperreachesoftheYellowRiver,isemployedtoverifythemodel.Theresultsshowthatthemodelisapplicableintheevaluationofanengineeringplaningwithplentyoffinesedimentmovement.

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简介：Capacitydepletionisanimportantinformationrequiredforplanningofmultipurposereservoirs.Itisacomplexphenomenoninvolvingdiversefieldslikesurfacehydrology,sedimenttransport,variedflowhydraulicsandsoilconsolidation.Properassessmentofcapacityreductionishelpfulinascertainingthelifeofthereservoirandtheprojectbenefitsforcost/benefitanalysis.Inthisstudydimensionallyconsistentequationsfordepositionvolumeandthetrapefficiencyhavebeenobtained.Methodsofobtainingtheparametersinvolvedtheseequationshavealsobeenindicated.Itwasfoundthatthereisgoodagreementwiththefielddata.Itishopedthattheequationsareusefultodesignengineer.

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简介：ThesedimentationofcircularparticlesinaverticalchannelfilledwithOldroyd-BfluidwasstudiedbyanimprovedDistributedLagrangeMultiplier/fictitiousdomain(DLM)method.Thesedimentingbehaviorsoftwoparticlesarepresentedfirstly,whichshowsthat,whentheparticlesaredroppedinaviscoealsticfluid,thestableconfigurationistheonewheretheparticlesarealignedparalleltotheflowdirectionwhentheMachnumberMislessthan1andtheelasticitynumberEisgreaterthan1.ThisagreeswellwiththeknownexperimentalinRef.[1]andsimulationresultsinRef.[2].Oursimulationsalsoshowthat,asinNewtonianfluid,thesedimentationoftheparticleswillbeacceleratedduetotheinteractionbetweenparticlesinaviscoealsticfluid.

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简介：Sedimentationbasedprocessesarewidelyusedinindustrytoseparateparticlesfromaliquidphase.Sincetheadventofthe'Nanoworld'thedemandforeffectiveseparationtechnologieshasrapidlyrisen,callingforthedevelopmentofnewseparationconcepts,oneofwhichliesinhybridseparationusingthesuperpositionofamagneticfieldformagneticparticles.Possibleproductportfolioofsuchseparationconsistsofpigmentproduction,nanomagneticsproductionforelectronicsandbioseparation.Apromisingstepinthatdirectionismagneticfieldenhancedcakefiltration,whichhasbynowprogressedfrombatchtocontinuousoperation.Insedimentationprocessesinamassforcefieldthesettlingbehaviourofparticlesstronglydependsonphysico-chemicalproperties,concentrationandsizedistributionoftheparticles.ByadjustingthepH,theinterparticleforces,inparticulartheelectrostaticrepulsion,canbemanipulated.Forremanentmagneticparticlessuchasmagnetite,pre-treatmentinamagneticfieldcouldleadtoachangeofinterparticleinteractions.BymagnetizingtheparticlesapartfromvanderWaalsattractionandelectrostaticrepulsion,anadditionalpotentialisinduced,themagneticattraction,whichcouldeasilydominatetheotherpotentialsandresultinagglomerationintheprimaryminimum.Bysedimentationanalysis,awidespectrumofparameterslikepH,magneticfieldstrengthandconcentrationhavebeeninvestigated.Theresultsshowastrongincreaseofsedimentationvelocitybymagneticflocculationoftherawsuspension.Thisleadstoariseinthroughputduetotheaccelerationofsedimentationkineticsbyimpartinganon-chemicalinteractiontothephysico-chemicalpropertiesinthefeedstreamoftheseparationapparatus.

简介：ＡｎｎｏｕｎｃｅｍｅｎｔａｎｄＣａｌｌｆｏｒＰａｐｅｒｓ：ＩｎｔｅｒｎａｔｉｏｎａｌＣｏｎｆｅｒｅｎｃｅｏｎＲｅｓｅｒｖｏｉｒＳｅｄｉｍｅｎｔａｔｉｏｎ（Ｓｅｐｔｅｍｂｅｒ９－１３，１９９６ＦｏｌｔＣｏｆｆｉｎｓ，Ｃｏｌｏｒａｄｏ，ＵＳＡ）Ｐｕｒｐｏ...

简介：一个数学模型被提出了基于为在水的暂停调查microparticles的沉积行为联合了连续、分离的粒子方法由把同样连续的液体阶段和粒子阶段当作分离，因此允许要列在后面的单个粒子和作为时间的功能要调查的粒子阶段的结构的进化的行为。模型考虑大多数包括货车derWaals对单个粒子起作用的占优势的力量吸引人，静电排斥，重力，Brownian，弄空，位，联系并且拖力量。代码也基于模型被开发了。这份报纸报导在各种各样的条件下面在水的暂停安定的单音分散microparticles的一些初步的建模结果。结果显示出液体阶段的短时间动力学，它有一个类似的数量级到粒子阶段。当他们的尺寸变得很小时，如此的短时间动力学能忍受意义到象粒子聚集那样的过程。结果的初步的分析也在粒子基于一个最新建议的参数安定的进化上被执行了，本地规范的卷部分(LNVF)。

简介：AluminumandTefloncylindricalparticleswithflatendsaredroppedinaqueousPolyoxsolutions.Theterminalequilibriumorientationoftheparticlesischaracterizedbythetiltangle,a,formedbythemajoraxisofthecylinderwiththehorizontal.ItisobservedthatαisafunctionoftheaspectratioL=L/d,whereListhelengthanddisthediameterofthecylinder,andthatitvariescontinuouslyfromacertainangle,α0,to90°,asLincreasestowardavalueL0.Foragivenshape,bothα0andL0dependonthedensityofthecylinderandthepropertiesoftheliquidused.FortheparticleswehaveconsideredthevalueofL0isoftheorderof2,This“tilt-anglephenomenon”disappearsassoonastheendsofthecylinderareround.Specifically,cylindersofthesamedensityandwiththesameaspectratiobutwithroundends.whendroppedinthesamepolymericsolutionwillreachafinalorientationwithα=90°.Therefore,thistilt-anglephenomenonseemstobetightlyrelatedtotheshapeoftheparticle.

简介：Inthispaper,thestate-of-the-artcomputationalsimulationtechnologiesforriversedimentationandmorphologyarecomprehensivelyreviewed.Emphasisisoncomputationalmodelling,whichincludesmathematicalmodellingequationsandclosures,numericalsolutionmethods,verificationandvalidation,modelintegration,andapplications.Severalimportantareasoffutureresearcharerecommended.

简介：<正>TheDevonianhydrotyermalsedimentationandmineralizationarewidespreadandtypicalinMaizi、KelangandChonghuerbasinsofsouthernAltaymargin,andhavetheirrespectivesignsinoccurrence,fabricandgeochemistry.Hydr)thermalsedimentaryrocksmainlyoccurintheintermittentperiodbetweenvolcanicsub(?)ycles.Theyarethin-midium-bedded,lenticularandbasicallyuniformtotheoccurrencesoftheoverlyingandunderlyingstrata.Theclassificationofthehydrothermalsedimentaryrocksisproposedbasedonthemineralcompositions.Thedetaileddescriptionsaregiventothefivetypesofhydrothermalsedimentaryrocks:silicates,feldspar-richrocks,

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简介：假设那床材料负担等于沉积运输能力通常是可接受的，如果在床和流动之间的交换即刻地发生。为非平衡沉积运输过程，然而，有空间、时间的延期效果。这为水库沉积过程是特别真的。恢复因素是为非平衡沉积运输的一个系数。恢复因素的决心能试验性地或数字地被获得。在以前的文学的恢复因素的价值上没有一致。有半的数字模拟--二个维的沉积运输模型，GSTARS4，为以前的研究建议的恢复因素的决心用各种各样的方法在这研究被进行。一座水库的模仿的结果几何变化对恢复因素的选择敏感。恢复因素作为沉积尺寸的功能提供了最合理的结果，这被发现。在恢复因素和沉积尺寸之间的一种功能的关系被比较模仿并且测量的水库决定几何变化。粗糙的沉积有恢复因素的小价值。