简介：在Beibu海湾的水循环和沉积运输为它的环境保护和资源利用是重要的。由采用为系统(ROMS)建模的地区性的海洋，我们在Beibu海湾学习了循环，沉积运输和长期的词法进化的季节的变化。模拟结果证明潮和风导致的发行量在海湾在冬季和夏天两个都是气旋的并且风驱动的发行量在夏天比那在冬季是更强壮的。沉积集中在Qiongzhou海峡，海南岛的西方和越南和Leizhou半岛的海岸是更高的。沉积在Qiongzhou海峡在夏天在冬季并且向东向西被搬运。Qiongzhou海峡的西方入口被统治由向西一整年搬运。在河边解除的沉积在河嘴附近被扔。模仿的结果证明沉积运输被潮汐的导致的底部暂停主要在Beibu海湾控制。四个特征为侵蚀和免职的分发模式被总结。(1)侵蚀和免职最是不足道的在里面海湾的区域。(2)沉积免职在Qiongzhou海峡的嘴是更重要的。(3)侵蚀在Qiongzhou海峡的海床被观察。(4)侵蚀和免职在海南岛的西方或者发生。

简介：Twostatisticalmodelsoftheconcentrationofsuspendedsedimentonmudcoastshavebeendevelopedbyusingthestepwiseregressionmethod.ThestatisticalanalysisinthispaperisbasedonthefielddataofthemudcoastofLianyungang,China.Theregressionmodelsprovideanessentiallycompletestatisticaldescriptionoftheprocessesoffine-grainedsedimentonopenmudcoasts.

简介：AcomprehensivefieldstudyhasbeenundertakentoinvestigatesedimentresuspensiondynamicsintheMoretonBay,alargesemi-enclosedbaysituatedinSouthEastQueensland,Australia.Aninstrumentedtripod,whichhousedthreecurrentmeters,threeOBSsensorsandoneunderwatervideocamera,wasusedtocollectthefielddataontides,currents,wavesandsuspendedsedimentconcentrationsatfoursites(Sites1,2,4,and5)inthebay.Site1waslocatedatthemainentrance,Site2atthecentralbayindeepwater,andSites4and5attwosmallbaysinshallowwater.Thebedsedimentwasfinesand(d50=0.2mm)atSite1,andcohesivesedimentattheotherthreesites.Basedonthecollectedfielddata,itisfoundthatthedominantdrivingforcesforsedimentresuspensionareacombinationofoceanswellandtidalcurrentsatSite1,tidalcurrentsatSite2,andwind-wavesatSites4and5.Thecriticalbedshearstressforcohesivesedimentresuspensionisdeterminedas0.079PainunidirectionalflowatSite2,and0.076Painwave-inducedoscillatoryflowatSite5.

简介：-ThispaperdescribesaradioactivetracerexperimentcarriedoutatthelandwardspoilsiteoftheNorthPassageintheYangtzeEstuaryinJune,1991.Scandium-46wasselectedasthetracer,thetotalactivityreleasedwas179.45GBqandtheamountoftheSandium-46glasswas495g.Thepurposeoftheexperimentwastodeterminethesedimentmovementdirection,path,velocityandtransportrate,andtherefore,toprovidedirectevidenceforusingthelandwardspoilsiteinthefuture.Theexperimentalresultsshowedthatthesedimentmovementwasgovernedbytheebbtidecurrentduringtheperiodofmeanandneaptideswhentheradioactivetracerwasinjectedbothonthefloodandebbtides,andthesedimentmovedfromthereleasepointtothemiddleoftheNorthPassagenearnavigationbuoyNo.269.Thedirecitonofthesedimentmovementwas110°,theparticlevelocitywas758m/d,andthesedimenttransportrateperunitwidthwas47.8m3/md.

简介：推迟的沉积的遥感上的量的申请是遥感学习的设计申请的一个重要方面。在这份报纸，厦门海湾被选择为学习区域。遥感数据的十一个不同阶段被选择建立一个量的遥感模型由使用遥感图象和伪同步的测量沉积数据印射推迟的沉积。基于开发的实验统计是在即时推迟的沉积集中和集中以及变换在表面层之间建模的平均tidally的推迟的沉积之间的变换模型推迟的沉积集中和平均深度的推迟的沉积集中。在这个基础上，量的应用程序推迟的沉积的遥感上的综合模型被开发。由象多时间的遥感图象一样使用这个模型，平均的多年推迟了厦门海湾的沉积集中被预言。在模型预言和多年平均的观察数据表演之间的比较象附近的地点的集中差别一样推迟了学习地点的沉积集中能被遥感模型很好与21.61%的错误率或更少预言，它能满足隧道免职计算的设计要求。

简介：-ThedataoflandsatTMofmulti-temporalforLingdingyangEstuary,PearlRiverinChinaisfirstlyusedwithsuspendedsedimentconcentrationoffieldmeasurementtoestablishacorrelativemodelequation.AftertheratioprocessingofTMdataandatmosphericcorrection,theimagesofsuspendedsedimentconcentrationofdifferenttemporalsareexportedfromtheimageprocessingsystemsAREISIIandIII.Theseimagesexpressthecharacteristicsofsuspendedsedimentdistribution,themodeofsedimenttransportandtheextentofdispersionundertheactionsoftidalcurrentandwindconditionofdifferentseasons.

简介：DescribedisaninitialattempttosimulatethesuspendedsedimentdynamicsrelatingtotidalandwaveforcingduringsummertimeinJune1980andAugust1981fortheYellowandEastChinaSeascontinentalshelf.Thecohesive/non-cohesivesedimentresuspensionandmovementgeneratedbytheinteractionbetweencurrentandwavearemodeledbyuseofECOMSEDandWAMCycle4.ModelresultsarecomparedwithobservationsinUS-ChinaMarineSedimentationDynamicsProgramperformedfor1980-81atofftheChangjiangestuary.Themainfeaturesofsimulationsshowthatsuspendedsedimentconcentrationsduringthesummerdecreasedmarkedlyoffshoreasobservedduringthesimulationperiods.Asforsomediscrepanciesforthemouthoftheestuarywithhighriverdischarges,i.e.,theChangjiangRiver,themodeldidnotproperlyreproducetheover-mixingsituationinthesummer;thusdistinctverticalconcentrationvariationinthislocalregionisnotagreeablewithobservation.However,generaldispersalpatternsofsuspendedsedimentmovementseemtobeagreeablyreproducedforthenearshoreshallowregion.Someoftheproceduresofsimulationandresultsarepresentedanddiscussed.

简介：NanxiaohongandNangangmainsouthchannelarechosenasthetypicalfloodandebbchannels.HydrodynamicsanalysisbasedonfieldhydrologicalandsedimentdataisconductedwithGao-Collinsmodeltoanalysesedimenttransporttrends.Also,thegrainsizedistributionanalysisofthebottomsedimentsampledinSep.2001isusedasthebaseoftheanalysis.TheresultshowsthatthesedimentinNanxiaohongisfromtherivemoutharea.Thesedimenttransportsupwardswiththefloodflowwhichisstrongerthantheebbflow,i.e.,inthedirectionofSE-WN.Thesedimentinmainsouthchannelcomesfromupward.Theytransportdownwardswiththeebbflow,whichisstrongerthanthefloodflow,i.e.,inthedirectionofWN-SE.Thedirections,sourcesandmechanismofsedimenttransportareidentifiedaccordingtocomprehensiveanalysesoftheobserveddataonhydrodynamicsandsediment.

简介：Settlingvelocityisafundamentalparameterinsedimenttransportdynamics.ForuniformPar-ticles,thereareabundantformulasforcalculationoftheirsettlingvelocities.Butinnaturalfields,sedi-mentconsistsofnon-uniformparticles.Theinteractionamongparticlesiscomplexandshouldnotbeneg-lected.Inthispaper,basedontheanalysisofsettlingmechanismofnon-cohesiveandnon-uniformparti-cles,atheoreticalmodeltodescribesettlingmechanismisproposed.Besidessuspensionconcentrationandupwardturbulentflowcausedbyotherparticles,collisionamongparticlesisanothermainfactorinflu-encingsettlingvelocity.Byintroducingthecollisiontheory,equationsoffallvelocitybeforecollision,colli-sionprobability,andfallvelocityaftercollisionareestablished.Finally,aformulausedtocalculatetheset-tlingvelocityofnon-cohesiveparticleswithwidegraingradationispresented,whichagreeswellwiththeexperimentaldata.

简介：StudyofthemajorAsianriversdischargetotheoceanrevealsvariationsoftheirwaterdischargesandsedimentloads,andlocalcharacteristicsofriversedimentconcentrations.Onthebasisofthis,theAsianriversfallintothreeregions,includingEurasiaArctic,EastAsia,SoutheastandSouthAsiaRegions.TheEurasiaArcticRegionischaracterizedbythelowestsedimentconcentrationandload,whiletheEastAsiaRegionisofthehighestsedimentconcentrationandhighersedimentload,andtheSouth-EastandSouthAsiaRegionyieldshighersedimentconcentrationandhighestsedimentload.Thesedimentloadsoftheseregionsaremainlycontrolledbyclimate,geomorphologyandtectonicactivity.TheEurasiaArcticriverswithlargebasinareasandwaterdischarge,drainlowreliefwhichconsistsoftundrasediment,thuscausingthelowestsedimentload.TheEastAsiariverswithsmallbasinareasandlowestwaterdischarges,drainextensiveloessplateau,andtransportmosterodibleloessmaterial,whichresultsinhighestsedimentconcentration.TheSEandSouthAsiariversoriginatingfromtheTibetPlateauhavelargebasinareasandthelargestwaterdischargesbecauseoftheSummerMonsoonandhighrainfallinfluence,causingthehighestsedimentload.InAsia,tectonicmotionoftheTibetPlateauplaysanimportantrole.ThoselargeriversoriginatingfromtheTibetPlateautransportabout50%oftheworldriversedimentloadtooceanannually,forminglargeestuariesanddeltas,andconsequentlyexertingagreatinfluenceonsedimentationinthecoastalzoneandshelves.

简介：Basedonthe2-DflowandsedimentnumericalmodeloftheYangtzeEstuaryandtheHangzhouBay,thecharacteristicsofwaterandsedimentexchangeintheirjointwatersisstudiedthroughquantitativecalculationandanalysisofthecharacteristicsofwaterflowandsedimenttransportation.Theresultsshowthatthereisperiodicalwaterandsedimentexchangeinthisjointwaters,thatthenetwaterexchangeappearsmainlybetween0～6mdepth(theoreticaldatumplane,thesamebelow)offshoreandthemaximumisnearthedepthof2m,andthatthenetsedimentexchangemainlyappearsbetween0～5mdepthandthemaximumisnearthedepthof3m,indicatingthattherangeofwaterflowpassageisdifferentfromthatofsedimenttransportfromtheYangtzeEstuarytotheHangzhouBay.Combinedwiththeresultsofnumericalsimulation,thispaperalsoanalyzesthehydrodynamicalmechanisminfluencingwaterandsedimentexchangebetweentheYangtzeEstuaryandtheHangzhouBay,includingtidalfluctuation,tidalcurrentkineticenergy,tide-inducedresidualcurrentandthetraceofwaterparticles.Finally,thesedimenttransportationpassageontheNanhuitidalflatisdiscussed,andtheresultsshowthatsedimentistransportedintotheHangzhouBayfromthesouthsideofShipilei,whilesedimentisbroughtbacktotheSouthChanneloftheYangtzeEstuaryfromthenorthside.

简介：Afterthesingle-strainabilitiesoforganic-pollutant-degradingbacteriainbioremediationofsedimentenvironmentofshrimpculturearedetermined,themultistraindegradingeffectofthecompositionsofdifferentstrainsismeasured.Theresultsindicatethatthemulti-strainsgroupshavehigherdegradingabilitythanthesingle-straingroups.Three-straingroupsarebetterthantwo-straingroups,andfourstraingroupsarebetterthanthree-straingroupsandfive-straingroups,thegroupscomposedofstrainsLt7222,Lt7511,Fc6308andGy7018hasthebestdegradingeffect,theCODMnremovalrateis73.2%in66h,andgetsto82.7%in114h,30%higherthanthatofthebestsingle-straingroup;GroupsofLt7222,Lt7511,Lt7451andGy7018arethesecond,whoseCODMnremovalrateis82.1%in114h,Itissuggestedthatmulti-speciesbacteriabeusedasfunctionalbacteriainbiorernediationofmaricultureenvironment.

简介：Inmarineengineering,thestrengthofasubmarinesedimentisanindispensableparameterforassessmentofconstruction.Inthisstudy,afree-fallconepenetratornamedIPenwasdevelopedtorealizearapidandefficientmeasurementofsedimentstrength.Theequipmentischaracterizedbymodulardesignandself-containeddataacquisition.Itisequippedwithanaccelerationsensor,awaterpressuresensor,andapiezoconepenetrationtest(CPTu)probe.Itisdesignedtobereleasedfromnearseabedsurfacewithareleaserandthenfallfreelytoprovideahigherpenetrationvelocity.Itsmaximumworkingdepthisapproximately2500mandmaximumpenetrationdepthisapproximately3m.Toderivethecorrelationbetweenpenetrationresistanceandsedimentstrength,acalibratorwasdevisedtodeterminethepenetration-ratefactor.Inaddition,thefactorapplicabletoinsitutestpointswasdeterminedinlaboratoryexperiments.InJune2016,theIPenwastestedinsituintheSouthYellowSea,China,duringasharedvoyagefundedbytheNationalScienceFoundation.Meanwhile,undisturbedcolumnsampleswerecollectedforlaboratorytests.Basedontheinsitutestresults,itwasdemonstratedthattheIPencouldaccuratelyrecordtheworkingstatesofvarioussensorsduringthefreelyfallingcourse.IPentestresultsreliablyreflectedthesedimentstrengthatallthetestingpointswhencomparedwithlaboratorycalibrationtests,insituvanetestsandpenetrationtests,laboratorypenetrationtests,andunconsolidatedandundrainedtriaxialcompressiontests.

简介：Thecompositionofdetritalmineralswithgradesof0.063-0.25mminthesuperficialsedimentofSouthYellowSeaismainlystudiedinthepaper.Theresearchresultshowsthatthemineralscanbedividedintomorethanfiftysorts.Thelightmineralsaremainlyfeldspar,quartz,mica,etc.Theheavymineralsaremainlycomposedofamphibole,epidote,mica,autogenypyrite,magnetite,hematite,garnet,zirconandsoon,whichmainlydistributeinthesedimentsofsiltyclayandlutaceoussilt.Accordingtothecontentanddistributionofthemainminerals,theresearchareaisdividedintofivemiteralcombinationprovinces.Theassembledtypesofmineralsineveryprovincehavecloserelationshipwithitshydrodynamicconditionsandsedimentaryenvironment.Andthesortsofdetritalmineralsalsoshowthatthedetritalsubstancesinthesedimentaryareasmainlyoriginatefromthedrainageareasofrivers,bedrockweathering,andtransformedsediment,etc.

简介：Thebottomsedimentsamplesweregatheredduringislandinvestigationin1994andintheperiodofcarryingoutthenaturalsciencefundprojectofFujianin1999.Thecomposition,distributionandassemblagecharacteristicsofheavymineralswhichgranularitydistributesfrom0.063to0.125mminthesedimentfromJiulongRiverestuaryarestudiedinthepaper.Theresultsshowthatthereare49kindsofheavymineralsandtheaveragecontentofthemis9.38%.Thedominantandcharacteristicmineralsaremagnetite,hematite,epidote,ilmenite,limonite,hornblende,zircon,andalusite,biotiteandsoon.4mineralassemblagezones(Ⅰ.ThewatercoursegatewayofJiulongRivermineralzone,Ⅱ.ThenorthernestuaryofJiulongRivermineralzone,Ⅲ.Thesouthernestuarymineralzone,Ⅳ.TheeasternestuaryofJiulongRivermineralzone),canbedividedbasedontheheavymineralcontentsandthedistributioncharacteristics,whichnotonlyrelatestothemattersourcesbutalsoiscontrolledbyhydrodynamicconditionandthesedimentaryenvironmentintheJiulongRiverestuary.

简介：Inestuarineandcoastalareas,theseabedisinaconstantprocessofdynamicchangeundermarineconditions.Seabedsedimenterosionandresuspensionareimportantprocessesthatsafelycontrolthegeologicalenvironment.FieldtripodobservationsconductedintheJiaozhouBayinChinaarereported,toinvestigatetheeffectsofhydrodynamicconditionsontheerosionandresuspensionprocessesoftheseabed.Theobservationalresultsshowthatthemaximumshearstresscreatedbytidalcurrentscanreach0.35N/m~2,whichishigherthanthewave-inducedshearstressduringfairweatherconditions.Aseabederosionfrequentlyoccursduringthefloodtide,whereasaseabeddepositionoccursduringebbtide.WavescanproduceabottomshearstressapproximatelyequivalenttothatinducedbycurrentswhenthelocalwindreachesForce4withaspeedof5m/s.Whenthewindreaches7m/sandthesignificantwaveheightreaches26cm,wavesplayamoresignificantrolethancurrentsinthedynamicprocessesoftheseabedsedimentresuspensionandleadtoahighvalueofturbiditythatisapproximatelytwotoeighttimeshigherthanthatinfairweather.Theseanalysesclearlyillustratethatperiodiccurrent-inducedsedimenterosionandresuspensionaredominantinfairweather,whereasepisodichighwavesareresponsibleforsignificantsedimentresuspension.AdditionalworkisneededtoestablishamorethoroughunderstandingofthemechanismsofsedimentdynamicsintheJiaozhouBay.

简介：Heavymineralswithasizerangeof0.125～0.250mminthesurficialsedimentofMinjiangEstuaryarestudied.Thirty-fourheavymineralshavebeenidentified,withanaveragecontentof1.92%.Majormineralsincludemagnetite,epidote,hematite,hornblende,ilmenite,andzirconmica.Thesetypesarethesameasthoseinthe0.063～0.125mmrange;however,theaveragecontentislower,whichrevealsthattheheavymineralsinMinjiangEstuaryaremainlyenrichedinthevery-finesandfraction.Accordingtothecontentanddistributioncharacteristicsofthemajorheavyminerals,MinjiangEstuarycanbedividedinto4mineralassemblagezones.Ineachzonetheassemblageofheavymineralsisgreatlyaffectedbythehydrodynamicconditionandthesedimentaryenvironment.HeavymineraltypesalsoshowthatdetritalmattersinMinjiangEstuaryareoriginatedfromtheweatheringanderosionofthebedrockintheMinjiangRiverdrainagearea.

简介：Verticalstructuresofmomentumexchangecoefficientandsedimentconcentrationarethekeysintheresearchonestuarineandcoastalsuspendedsedimenttransport.Basedontheparabolicmixinglengthdistributionpattern,thedistributionpatternofverticalmomentumexchangecoefficientwhichissuitableforestuarineandcoastalwatersisconstructed.AcomparisonwithsteadyflowandmeasuredmomentumexchangecoefficientduringonetidalcycleintheMenaiStraitofEnglandshowsthattheresultofthispatternisclosertothemeasuredvaluesthanthoseofcommonlyusedRouse'sandvanRijn'spatterns,andthepatternisalsosuitableforestuarineandcoastalwaters.Successively,basedonthepreconditionthatmomentumexchangecoefficientisequivalenttosedimentturbulentdiffusioncoefficient,andcombiningwiththeDiffusionTheory,weobtaintheexponentialverticaldistributionpatternofsedimentconcentration,whichisalsosuitableforestuarineandcoastalwaters.Thereby,usingmeasuredverticalstratifiedsedimentconcentrationdataoftheSouthandtheNorthPassagesoftheYangtzeEstuaryandZhoushanarchipelagowatersforfittingcalculation,andcomparingtheresultswiththosefromRouse's(1938)andZhangetal.'s(1989)formulas,theresultsshowthattheexponentialverticaldistributionpatternofsedimentconcentrationobtainedinthepresentstudynotonlyovercomesthedefectofRouse'sformulathatthesurfacesedimentconcentrationwillbe0,butalsohasaholistichigherprecisionalongtheverticallinesthanthoseofRouse'sandZhangetal.'sformulas.

简介：Inthisstudy,thecombinedactionsofwavesandtidalcurrentsinestuarineandcoastalareasareconsideredanda2Dmathematicalmodelforsedimenttransportbywavesandtidalcurrentshasbeenestablishedinorthogonalcurvilinearcoordinates.Non-equilibriumtransportequationsofsuspendedloadandbedloadareusedinthemodel.Theconceptofbackgroundconcentrationisintroduced,andtheformulaofsedimenttransportcapacityoftidalcurrentsfortheOujiangRiverestuaryisobtained.TheDouGuorenformulaisemployedforthesedimenttransportcapacityofwaves.SedimenttransportcapacityintheformofmudandtheintensityofbacksiltingarecalculatedbyuseofLuoZaosen'sformula.Thecalculatedtidalstagesareingoodagreementwiththefielddata,andthecalculatedvelocitiesandflowdirectionsof46verticallinesfor8crosssectionsarealsoingoodagreementwiththemeasureddata.Onsuchabasis,simulationsofbacksiltingafterexcavationofthewaterwaywithasandbarundercomplicatedboundaryconditionsinthenavigationchannelinducedbysuspendedload,bedloadandmudbywavesandtidalcurrentsarediscussed.

简介：Basedonthecharacteristicsofwaves,tidalcurrents,sedimentandseabedevolutionintheCaofeidianseaareaintheBohaiBay,a2Dsedimentmathematicalmodelofwavesandtidalcurrentsisemployedtostudythedevelopmentschemesoftheharbor.Verificationofspringandneaptidalcurrentsandsedimentinthewinterandsummerof2006showsthatthecalculatedvaluesoftidalstagesaswellasflowvelocities,flowdirectionsandsedimentconcentrationof15synchronousverticallinesareingoodagreementwiththemeasureddata.Also,depositionanderosionoftheseaareainfrontofCaofeidianoreterminalinducedbysuspendedloadundertidalcurrentsandwavesareverified;itshowsthatthecalculatedvaluesofdepthofdepositionanderosionaswellastheirdistributionareclosetothemeasureddata.Furthermore,effectsofreclamationschemeofislandinfrontofthelandbehindCaofeidianharboronthehydrodynamicenvironmentarestudied,includingchangesofflowvelocitiesinthedeepchannelsatthesouthsideofCaofeidianforelandandLaolonggouandinvariousharborbasins,aswellaschangesofdepositionanderosionofseabedinducedbytheproject.