简介：来自12个车站的沉积从Tupilipalem海岸，印度的东南海岸，和一套重金属的存在被取样包括铁(Fe)被建立，锰(Mn)，铬(Cr)，铜(Cu)，镍(Ni)，铅(Pb)，锌(Zn)和镉(Cd)。重金属被因素分析，其结果在Fe，Mn，Cr，Cu，Ni，Pb，Zn，和Cd之中显示出积极或否定的关联估计。因素分析也显示在学习区域的沉积的重金属有不同生来、人为的来源。同样，一个沉积污染评价被做用Geoaccumulation索引(Igeo)，丰富因素(EF)，和污染装载索引(PLI)。Geoaccumulation索引显示Tupilipalem海岸的表面沉积极其与Fe，Mn，Cr，Cu，Ni，Pb，和Zn被污染。丰富因素的计算与Cr，Cu，和Ni关于Pb，Zn，和Cd和中等丰富显示出重要丰富。平均内容丰富因素的掉落的趋势是Cd>Pb>Zn>Cu>Cr>Ni>Mn>Fe。Cd的PLI价值更高出现(>1)价值由于不同外部来源的影响喜欢农业流量，工业活动，和另外的人为的输入。90在学习下面的百分之二重金属在Buckingham运河和农业的其它和aquacultural自河与孟加拉的海湾连接的车站TP-5显示出最高的集中。这个地点是周期性地被关上的第二个入口，看起来，学习区域的这些部分被人为的污染重重地影响。

简介：从1951～2011在东廷·莱克分水岭基于地调查水文学系列，lakebed沉积siltation/erosion(证券交易所)的变化在三座峡水库(TGR)的操作以后的东廷·莱克的政体被分析。显著地积极的关联从Zhicheng和三个插头在流动率之间被发现(r2=0.859,p<0.0001)，并且在流动之间，率和沉积交货在三个插头评价(r2=0.895,p<0.0001)。这显示在三个插头的流动率和沉积交货率被流动率大部分从在上游的长江决定。在东廷·莱克盆的沉积免职数量从+4796.4落下??h

简介：PhosphorussorptioncapacitywasinvestigatedinsurfacesedimentsderivedfromanabandonedzincleadminearealocatedinnortheasternAlgeria.Theformsandthedistributionofphosphorusintherawsedimentwereidentifiedusingthesequentialchemicalextractionsmethod.Batchexperimentsweredonetostudytheadsorptionkineticsandisotherms.ThepHeffectwasevaluatedbymacroscopicandinfraredanalyses.Inrawsediment,speciationresultsshowthatphosphorusisdominantlyboundtooxyhydroxides.Sorptionexperimentsdemonstratethatphosphorusuptakeisprincipallyrelatedtosedimentcomposition.Thenatureofthedominantironoxyhydroxidehasasubstantialroleintheadsorptioncapacityandthemechanisminteraction.TheadsorptionkineticscanbedescribedbythesecondorderandElovichmodels.TheisothermsdataaresuccessfullymodeledbytheTemkinequation.ThemaximumphosphorusremovalisreachedunderacidicpH.Spectroscopicanalysesrevealthatthepredominanceofjarositeimplieselectrostaticinteractionwithsedimentparticles.However,inthecaseofschwertmannitepredominance,phosphateionsareadsorbedbytheligandexchangemechanism.&2017InternationalResearchandTrainingCentreonErosionandSedimentation/theWorldAssociationforSedimentationandErosionResearch.PublishedbyElsevierB.V.Allrightsreserved.

简介：Suspendedsedimentconcentration(SSC)isanimportantparameterinmarinesedimentology.Withthedevelopmentoftechnology,manyacousticandopticaldevices,suchastheLaserIn-SituScatteringandTransmissometry,havebeendesignedtomeasureinsituSSCandgrainsizedistribution.Butduetofundorotherrestrictions,manyexperimentswereonlyconductedinlaboratory,usinganindoorlasergrain-sizeanalyzerandgravimetricmethodtomeasuregrainsizedistributionandconcentration,respectively.Inthisstudythelaboratoryexperimentissimplifiedbyomittingthetiringstepofgravimetricmethod.TheconnectionsbetweenSSCandotherparameters(obscuration,D50andsortingindex)wereinvestigatedbasedon124surfacesedimentsamplescollectedfromdifferentoffshoreareas.AnewmethodisdevelopedfordeterminingSSCinlaboratoryusingalasergrain-sizeanalyzer.

简介：一个活动床的、未失真的物理模型(1:40)被用来通过河岸保护移动和丁提尺寸和配置的修正调查不同沉积供应策略到旧来因河，它引起河岸侵蚀。这条训练隧道以前巴塞尔(瑞士)下游地是上面的来因河的主要的床，但是自从宏大运河d'Alsace，一条航行运河，和一个流动控制水坝的构造，它在梳(法国)有人工地低的流动政体。训练工作和随后的隧道切口极大地也减少了沉积运输率并且创造一重重地armoured床。建模的飞行员地点在左河岸上有一个丁提领域。结果证明在这个地点的当前存在的丁提不在创造导致的高银行方面速度存侵蚀是有效的，甚至为比吝啬的年度流动率显著地高的流动率。河岸也比以前想证明了更抵抗，允许安全地要搬迁的河岸保护的长段。在二更高的、更大的岛丁提进一步分开被放比三存在依附的丁提的地方，测试进程的物理模型为丁提域生产了一种新配置。这条创新途径证明了有效，引起为在吝啬的年度流动率下面的流动率的河岸侵蚀，与被观察的一致侵蚀。如此的一种配置不为宏大运河d'Alsace提出危险，这也被发现了，它靠着旧来因河是位于的，通过在高流动事件期间的过多的河岸侵蚀。

简介：《InternationalJournalofSedimentResearch》（译名《国际泥沙研究》）自2007年起成为SCI源刊，被SCI—E收录。本刊为季刊，刊登内容除泥沙运动力学和河床演变等外，还包括地理学、地貌学、土壤侵蚀、流域产沙、水土保持、泥沙对环境及生态的影响、泥沙所引起的社会和经济问题评估等涉及全流域的泥沙问题。

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简介：Arobustmethodforcharacterizingthemineralogyofsuspendedsedimentincontinentalriversisintroduced.Itencompasses3steps:thefiltrationofafewmillilitersofwater,measurementsofX-rayenergydispersivespectrausingScanningElectronMicroscopy(SEM),androbustmachinelearningtoolsofclassification.ThemethodisappliedtosuspendedparticlescollectedfromvariousAmazonianrivers.Atotalofmorethan204,000particleswereanalyzedbySEM-EDXS(EnergyDispersiveX-raySpectroscopy),i.e.about15,700particlespersamplingstation,whichleadtotheidentificationof15distinctgroupsofmineralogicalphases.ThesizedistributionofparticlescollectedonthefilterswasderivedfromtheSEMmicrographstakeninthebackscatteredelectronimagingmodeandanalyzedwithImageJfreeware.Thedeterminationofthemainmineralogicalgroupscomposingthebulksedimentassociatedwithphysicalparameterssuchasparticlesizedistributionoraspectratioallowsaprecisecharacterizationoftheloadoftheterrigenousparticlesinriversorlakes.InthecaseoftheAmazonianriversinvestigated,theresultsshowthattheidentifiedmineralogiesareconsistentwithpreviousstudiesaswellasbetweenthedifferentsamplescollected.Themethodenabledtheevolutionofgrainsizedistributionfromfinetocoarsematerialtobedescribedinthewatercolumn.Implicationsabouthydrodynamicsortingofmineralparticlesinthewatercolumnarealsobrieflydiscussed.Theproposedmethodappearswellsuitedforintensiveroutinemonitoringofsuspendedsedimentinriversystems.

简介：Atwo-dimensionaldepth-integratednumericalmodelisrefinedinthispapertosimulatethehydrodynamics,gradedsedimenttransportprocessandthefateoffaecalbacteriainestuarineandcoastalwaters.Thesedimentmixtureisdividedintoseveralfractionsaccordingtothegrainsize.Abedevolutionmodelisadoptedtosimulatetheprocessesofthebedelevationchangeandsedimentgrainsizesorting.Thefaecalbacteriatransportequationincludesenhancedsourceandsinktermstorepresentbacterialkinetictransformationanddisappearanceorreappearanceduetosedimentdepositionorre-suspension.Anovelpartitionratioanddynamicdecayratesoffaecalbacteriaareadoptedinthenumericalmodel.ThemodelhasbeenappliedtotheturbidwaterenvironmentintheBristolChannelandSevernestuary,UK.Thepredictionsbythepresentmodelarecomparedwithfielddataandthosebynon-fractionatedmodel.

简介：最后二十年在自然的河里为浅流动见证正常数字模型的开发和应用程序。然而，直到现在，为有不一致的沉积运输的流动没有如此的模型。这篇论文论述1D在冲积的河里模仿流动和不一致的沉积的非能力运输的正常模型。活跃的层明确的表达被采用解决床沉积作文的变化。在集中的有限体积斜坡LImiter(SLIC)的框架策划，一个表面坡度方法被合并达到正常答案到管理方程。建议模型与不规则的地形学靠着典型盒子被测试，包括挖出的沟再装满，沉积由于沉积由于山崩水坝失败过载和洪水流动。在计算结果和测量数据之间的协议是令人鼓舞的。比作一个非正常的模型，正常模型特征在复制舞台，速度和床变丑改进了性能。它应该在冲积的河里为不一致的沉积运输建模发现一般应用，特别在床地形学主要是不规则的山区。

简介：Thehorizontalaccuracyoftopographicdatarepresentedbydigitalelevationmodel(DEM)resolutionbringsaboutuncertaintiesinlandscapeprocessmodelingwithrasterGIS.Thispaperpresentsastudyontheeffectoftopographicvariabilityoncell-basedempiricalestimationofsoillossandsedimenttransport.AnoriginalDEMof10mresolutionforacasewatershedwasre-sampledtothreerealizationsofhighergridsizesforacomparativeexamination.EquationsbasedontheUSLEareappliedtothewatershedtocalculatesoillossfromeachcellandtotalsedimenttransporttostreams.ThestudyfoundthatthecalculatedtotalsoillossfromthewatersheddecreaseswiththeincreasingDEMresolutionwithalinearcorrelationasspatialvariabilityisreducedbycellaggregation.TheUSLEtopographicfactors(LS)extractedfromappliedDEMsrepresentspatialvariability,anddeterminetheestimationsasshowninthemodelingresults.ThecommonlyusedUSGS30mDEMappearstobeabletoreflectessentialspatialvariabilityandsuitablefortheempiricalestimation.TheappropriatenessofaDEMresolutionisdependentuponspecificlandscapecharacteristics,appliedmodelanditsparameterization.ThisworkattemptstoprovideageneralframeworkfortheresearchintheDEM-basedempiricalmodeling.

简介：Thecomposition,assemblageanddistributioncharacteristicsofheavymineralsfrom63to125μmgrainsizesinsurfacesedimentfromtheXinghuaBay(17stations)arestudied.Themattersourceofsiltandtherelationshipbetweenheavymineralsandsedimentaryenvironmentarealsodiscussed.Theresultsshowthatthereare37kindsofheavymineralsandtheaveragecontentofthemis12.08%,whichexceeds6%comparedwiththeMeizhouBay(5.67%).Thedominantmineralsaremagnetite,hornblende,epidote,ilmenite,hematite,limonite,zirconandsoon.MineralkindsrevealthatthesourcesofsiltinthisbayarethefluvialinputanderodedproductsofbedrockincircumjacentlandandislandsoftheXinghuaBay.However,themattersourcefromoutsidethisbayisless.FourmineralassemblagezonescanbedividedbasedonheavymineralcontentsanddistributioncharacteristicsintheXinghuaBay,whicharenotonlyinfluencedbymattersource,butalsocontrolledbyhydrodynamicconditionandsedimentaryenvironmentintheXinghuaBay.

简介：虹吸与一辆漂流坦克和不同虹吸吸挖出出发，包括平凡类型并且与/没有方面洞的楔类型，通过斜槽，实验被用来调查水库沉积移动效率。当到床的从吸头的距离是大约25%吸头直径时，实验揭示了最大的吸压力和速度。吸压力从吸头作为距离很快减少了到增加到50%的床和吸头直径的100%。楔类型吸头完成的吸压力仅仅绕平凡类型的吸头是那中的16.917.6%个，并且绕楔类型吸头的速度绕平凡类型的吸头是那中的64.768.4%个。然而，平凡类型的吸头是到它的长跳时期的容易堵塞的雌动物。为平凡类型的吸头的平均的跳时期是大约105263%楔类型吸头的。当漂流坦克直径是乘吸头的的34时，沉积移动效率被完成。当吸头直径和方面洞直径分别地增加了，流动分泌物和沉积移动增加了。最有效的方面洞区域是在15%吸头区域以内的一个区域。完全，最佳的沉积移动效率是20敨挠牡的楔角度吗？？

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简介：Soilerosionatthehilly-gullyregionoftheLoessPlateauhasobviousverticalerosionzonationfromwatershedboundarytogullyedge.Meanwhile,upsloperunoffandsedimenthaveasignificantimpactonthedownslopeerosionprocess.Butduetothelimitsofresearchmethods,thereisnotmuchdataavailabletoquantifytheeffectsofupsloperunoffandsedimentonthedownslopeerosionprocessunderdifferentconditions.Theobjectiveofthisstudywastoquantifytheeffectsofupsloperunoffandsedimentonthedownslopeerosionprocessusingadual-boxsystemwitha15°gradientconsistingofa2m-longfeederboxanda5m-longtestboxunderdifferentrunoffratesandsedimentconcentrationsinupsloperunoff,rainfallintensitiesandsoilsurfaceconditions.Theresultsshowedthatthesedimentregimewasdetachment-transportdominantatsteephillslopes.ThenetsedimentdeliveryScausedbyupsloperunoffwascontrolledbysedimentconcentrationinupsloperunoff,especiallybyinteractionoftherainfallintensity,runoffrate,surfaceconditionanddominanterosionprocess.ThenetsedimentdeliverySaccountedforthetotalsedimentdeliverySftatdownslope31.7%to97.3%and27.8to89.7%forbothlooseandcompactsurfacetreatments,respectively.Rainfallintensity,slopegradient,surfacecondition,andrillerosiondevelopmenthadimportantinfluencesonthedownslopeerosionprocess.

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简介：在2011年10月，种形成，分发，和潜在的生态的风险在厦门海湾基于表面沉积的调查对在这个区域的重金属(Cu，Pb，Zn，Cd，和Cr)的评价用顺序的抽取方法和生态的风险评价被学习方法。结果显示了：(1)这些重金属的全部的集中被流量，工业废水，和污水影响，并且都比的在沿海的区域是更高的近海区域当Pb的最高的区域由于空气是远一些的离开沿海的水时免职；(2)顺序的抽取建议Cu主要与剩余被填写，Fe/Mn-oxide绑了部分，Pb被绑在Fe/Mn-oxide，Zn和Cr被剩余统治，并且Cd跳了到可交换并且碳酸盐部分；(3)移植和转变顺序的顺序是Cd>Pb>Cu>Zn>Cr和污染的度是Cd>Pb>Cu>Zn>Cr；并且(4)第二等、主要的阶段的比率证明Zn和Cr两个都是干净的，Cu可以被弄脏，Pb中等被弄脏，当Cd重重地被弄脏时。

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简介：Basedonaseriesofexperimentsunderbothice-coveredandfreesurfaceconditions,thepresentarticlediscussestheroleofflowvelocityandcriticalshearReynoldsnumberforincipientmotionofbedmaterial.Theinfluenceoftheresistancecoefficientsofboththeundersideoftheicecoverandthechannelbedonthelocationofthemaximumvelocityhasbeendiscussed.Inaddition,theimpactsoficeandcompositeresistancecoefficientsonflowvelocityforincipientmotionofbedmaterialhavebeenassessed.ThediagramdescribingthecriticalshearReynoldsnumberandthedimensionlessshearstressfortheincipientmotionofsedimentundericecoveredconditionswithdifferentundercoverresistancecoefficienthasbeenestablished.TheeffectsofgrainsizeondensimetricFroudenumberforincipientmotionofbedmaterialhavebeeninvestigated.ArelationshipbetweenthedensimetricFroudenumberforincipientmotionofbedmaterialandthemediangrainsizeofbedmaterialaswellastheroughnesscoefficientofchannelbedandroughnesscoefficientoficecoverhasbeenestablished.