简介：ArangesurveydatabaseisestablishedandusedtostudythedepositionorerosionprocessesintheLowerYellowRiver(LYR).Thehugeamountofdataobtainedthroughrangesurveysovernearly50yearsismanagedbysoftware(RGTOOLS)developedforthisstudy.RGTOOLSisalsousedtoevaluatetheamountanddistributionofdepositionorerosioninLYR.Volumetricmethodisusedforcomputationoftheamountofdeposition.Spatialandtemporalvariationsofthedepositionarestudiedandillustratedwithdrawings.Itisfoundthatatotalof6.44billionm3ofsedimentweredepositedinthelowerYellowRiveroverapproximately50years.Thepatternofdepositionvariesinresponsetothevariationofoncomingflow,whichisinfluencedbynaturalclimaticvariationsandalsobyreservoiroperation.

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简介：Aformulaforthecomputationsoflocalscourdepthattheheadofspursisderivedaccordingtotheequilibriumprincipleofincipientmotionofsedimentparticle.Theproposedformulaisverifiedwithlaboratorydataandfieldmeasurements.Inthederivationofthisformula,twodifferentscourresistanceforces,thecohesiveforceandthegravitationalforce,areconsidered,andtheintegratedcoefficientiscalibratedusingdatafromtheLowerYellowRiver.

简介：在这份报纸，我们基于一般一个维的morphodynamic模型执行理论分析让河以便显示出一条河的词法平衡怎么走水路被影响并且沿着河的沉积转向/供应。分析的结果沿着更低的黄河证明大规模浇消遣，象那些一样，能引起凸的河床侧面的发展在长期。免职将沿着河的整个活动范围发生，与增加的免职深度从对下游在上游。河床的斜坡增加从对在上游下游。而且，词法时间规模上的分析证明在更低的黄河的这开发将花一时间大概到世纪的十年的时期。分析的结果与在更低的黄河的观察相比。自从1980年代的后半部，从黄河的大规模水消遣一直在发生。观察证明这确实沿着河导致了重要沉积。

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简介：这份报纸从1950～2003用测量数据在更低的黄河学习在满满的分泌物，侧面的生气的节变化和到来的流动和沉积状况之间的关系。自从1950，满满的分泌物显然减少了，到流动深度的隧道宽度的比率增加了。批评年度平均到来的沉积系数(定义为沉积集中的比率排出)并且分别地，在Huayuankou车站的分泌物为从Huayuankou发生在活动范围到Lijin的没有积聚的免职是约0.012和1,850m3s1。在这个基础上，一个数学模型被用来在不久的将来在可能的到来的流动和沉积条件下面在更低的黄河和它的相应满满的分泌物学习主要隧道的规模。影响主要隧道的规模的主要因素被分析，并且测量塑造并且坚持说一条中型的隧道被讨论。结果显示出在塑造主要隧道上免除Xiaolangdi水库的各种各样的水和沉积联合的效果并且建议在最近的到来的流动和沉积条件下面，与满满的分泌物塑造并且维持一条中型的隧道是可能的近似4,000m3s1。

简介：SedimentsupplytothelowerJingjiangRiverwillbesubjecttosubstantialreductionaftertheimpoundmentoftheThreeGorgesReservoir,whichcouldresultinanexcessofcarryingcapacityandseriousbankerosionsinthedownstreamalluvialchannel,threateningthebankprotectionworksandthesafetyoftheJingjiangDyke.ThispaperpresentsasummaryofresearchworksconcerningthefluvialprocessesinthelowerJingjiangRiverandthepossibleimpactoftheThreeGorgesReservoirimpoundmentonthevariationofitschannelpattern.Threedifferentpredictionshavebeenputforwardbyresearchers:1)theJingjiangRiverwillevolvetowardsamoresinuous,meanderingchannelpattern,withextensivebankerosiontakingplacealongtheriver;2)theriverchannelwillbestraightenedandbroadenedbecausenopointbarcanbeformedduetoreducedsedimentsupplywhilebankerosiondevelopsintheconcavebank,and3)thisriverreachwillmaintainitspresentchannelpatternwithoutsignificantchange,althoughthesinuositymaybeslightlyreduced,since:a)theThreeGorgesReservoirmainlyinterceptsedimentparticleswithsizeslargerthan0.025mm,andb)thecomplexinteractionbetweentheYangtzeRiverandtheDongtingLakehelpstoreducethenegativeeffectofchannelerosionthroughcertainself-adjustingmechanisminfluvialprocesses.DiscrepancybetweenthesepredictionsshowsthatfurtherresearcheffortsareneededtounderstandtheimpactofThreeGorgesReservoiroperationonthedownstreamfluvialprocesses.Meanwhile,thereisanurgentneedtocloselymonitorfuturedevelopmentinthefluvialprocessesoftheJingjiangRiveranditsinfluenceonthesafetyoftheJingjiangDykes.

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简介：Aquasi-2Dunsteadyflowandsedimenttransportmodelsuitableforthesimulationoflargelowlandriversystems,includingtheirfloodplains,ispresented.Thewaterflowandsedimentequationsarediscretisedusinganinterconnectedirregularcellsscheme,inwhichdifferentsimplificationsofthe1DdeSaintVenantequationsareusedtodefinethedischargelawsbetweencells.Spatially-distributedtransportanddepositionoffinesedimentsthroughouttheriver-floodplainsystemaresimulated.Themodelisappliedovera208-kmreachoftheParanaRiverbetweenthecitiesofDiamanteandRamallo(Argentina)comprisingariver-floodplainareaof8100km~2.Aftercalibrationandvalidation,themodelisappliedtopredictwaterandsedimentdynamicsduringsyntheticallygeneratedextraordinaryfloodsof100,1000,and10,000yearsreturnperiod.Thepotentialimpactofa56-kmlongroadembankmentconstructedacrosstheentirefloodplainissimulatedandcomparedtomodelresultswithouttheembankment.Theembankmentresultsinincreasesinupstreamwaterlevels,inundationextent,flowduration,andsedimentdeposition.

简介：训练策略的一条河的选择为更低的黄河(LYR)是极其重要的。当前，宽河的训练策略在训练LYR适用。然而，在在黄河盆的水文学过程的显著变化，以及从在黄河盆的社会经济的开发的立即的压力，使如果有可能性改变从到狭窄河的训练的宽河的训练训练策略的河，考虑必要。这研究调查通过数字模拟在LYR上训练策略的不同的河的影响。一一个维(1-D)模型被用来为未来模仿河的过程50年并且一三维(3-D)模型被使用学习典型洪水。学习集中了于河形态学，结果看那在两水分泌物的在场减少趋势和沉积负担是否坚持，在LYR的免职率将进一步减少不管什么策略被使用。特别，狭窄河的训练能达到目的与宽河的训练相比在LYR增加沉积运输能力。如果到来的水和沉积负担恢复到最后世纪的吝啬的水平，主要隧道收缩不管多么不可避免地由于沉积发生为宽河、狭窄河训练。最重要地，这研究证明狭窄河的训练在整个LYR上减少免职数量，但是它几乎不在减轻推迟的河的发展提供很少帮助。相反，狭窄河的训练能在河模式从高度漫步到蜿蜒地流变化的过渡活动范围引起沉积，进一步的变得更坏在那里的驼峰免职。因为关于在在可行工程的黄河盆，和缺乏的水文学过程的未来变化的无常，测量在LYR减轻推迟的河和驼峰免职问题，小心应该在为LYR训练策略的河里关于变化被行使。

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简介：Retrogressiveerosion,awidespreadphenomenonofsedimenttransportinreservoirs,oftenimpactsonboththereservoircapacityandthesedimentationinthedownstreamriverchannel.BasedonfielddatafromtheSanmenxiaReservoirandtheLowerYellowRiveroverthepastdecades,threecoursesofretrogressiveerosionwithdistinctivefeatureswereanalyzed.Theresultsindicatethatretrogressiveerosion,especiallycausedbyrapidreductioninthewaterleveltillthereservoirisempty,oftenresultsintheserioussiltationofthelowerYellowRiverandthreatensthesafetyofthefloodcontrolintheLowerYellowRiver.Unreasonableoperationofthereservoirandincominghyperconcentratedfloodsaccompaniedbyretrogressiveerosionalsoaggravatethesiltationofthemainchanneloftheriver.However,areasonableoperationmodeofthereservoirsonamed”storingtheclear(lowsedimentconcentration)waterinthenon-floodseason,andsluicingthemuddy(highsedimentconcentration)waterinthefloodseason”wasfound,whichmightmitigatethedepositioninboththereservoirandtheLowerYellowRiver.Thisoperationmodeprovidesimportantexperienceforthedesignandoperationoflargereservoirsinotherlargeriverscarryinghugeamountsofsediment.