简介：TheLAGFD-WAMwavemodelisathirdgenerationwavemodel.Inthepresentpaperthephysicalaspectofthemodelwasshowningreatdetailincludingenergyspectrumbalanceequation,complicatedcharacteristicsequationsandsourcefunctions.

简介：Theauthorsmakeanendeavortoexplainwhyanewhybridwavemodelishereproposedwhenseveralsuchmodelshavealreadybeeninoperationandtheso-calledthirdgenerationwavemodejisprovingattractive.Thispartofthepaperisdevotedtothewindwavemodel.Bothdeepandshallowwatermodelshavebeendeveloped,theformerbeingactuallyaspecialcaseofthelatterwhenwaterdepthisgreat.Thedeepwatermodelisexceptionallysimpleinform.Significantwaveheightistheonlyprognosticvariable.Incomparisonwiththeusualmethodstocomputetheenergyinputanddissipationsempiricallyorby"tuning",theproposedmodelhasthemeritthattheeffectsofallsourcetermsarecombinedintoonetermwhichiscomputedthroughempiricalgrowthrelationsforsignificantwaves,theserelationsbeing,relativelyspeaking,easierandmorereliabletoobtainthanthoseforthesourcetermsinthespectralenergybalanceequation.Thediscretepartofthemodelandtheimplementationofthemode

简介：-Inthispaperasimpleandefficientimplicitfinite-differenceschemeisusedfordepth-averagedtwo-dimensionalstormsurgemodel.Thisfinite-differenceschemeissimplerandmoreefficientthanthewi-dely-usedADIscheme.Accuracyanalysisandstabilityanalysisindicatethattheschemehastwo-orderac-curacyandisunconditionallystablewhenthegridsizeisconstant.ThepresentanalysisresultsshowthattheschemeisofhighernumericalaccuracythanthatintroducedbyMaa(1990).Aftertestedbyidealmod-els,acalculationexampleofarealtyphoonsurgeiscarriedout,theresultsofthenumericalsimulationco-incidewellwiththeobserveddataandtheaccuracyissufficientforengineeringapplications.

简介：Anonlinearshort-wave-averaged(surfbeat)modelispresented.ThemodelisbasedonthatofRoelvink(1993),butthenumericaltechniquesusedinthesolutionarebasedontheso-calledweighted-averagedflux(WAF)method(egWatsonetal.,1992),withtime-operatorsplittingusedforthetreatmentofsomeofthesourceterms.Thismethodallowsasmallnumberofcomputationalpointstobeused,andisparticularlyefficientinmodellingbreakinglongwaves.Theshort-wave(orprimary-wave)energyequationissolvedusingamoretraditionalLax-Wendrofftechnique.Resultsofvalidationindicatethatthemodelperformssatisfactorilyinmostrespects.

简介：Inthefirstpartofthepresentpaperwehaveexplainedwhywemanagetoformulateanotherwavepredictionmodelwhensomanyofthem,includingtheso-calledthirdgenerationmodel,havealreadybeeninuse.Thewind-wavepartoftheproposedmodelhasalsobeengiven.Nowweproceedtodiscusstheswellpart,theimplementationofthemodelasapredictionmethod,mumericalexperimentsdonewithidealwindfieldsandhindcastsmadeintheBohaiSea,intheneighboringseasadjacenttoChinaandintheNorthwestPacific.

简介：Inthispaper,thej,υcorrectedformulaeoftheamplitudesandthephasesof58astronomicalconstituentsaregiven,andthemodelsfortheanalysisandpredictionof169constituentsarepresented.ThenewCartwright’scalculatedresultsofthetidalpotentialareused,andthequadraticanalysisismade.Ithasbeenprovedbyanumberoftrialsthattheharmonicconstantsofconstituentsaremorestableandtheaccuracyofthepredictedresultreliable.

简介：AnellipticalwindfieldmodeloftyphoonsisputforwardbasedonthecharacteristicsofthetyphoonwindfieldsoccurringintheYellowSeaandBohaiSea.Bycontrastingitwiththecirculartyphoonwindfieldmodel,itisfoundthattheellipticalmodelcanadequatelyrepresenttherealwindfieldandtracetheprocessofatyphoonstormsurge.Thenumericallysimulatedresultsofstormsurgesbyusingtheellipticalmodelareingoodagreementwiththeobservationsandmarkedlybetterthanthosebyusingthecircularmodel.

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

简介：Asemi-implicitandEulerian-Lagrangianfinitedifferencemethodforthree-dimensionalshallowflowhasbeenextendedtoamorecompletesystemofequationsincorporatingsecond-momentturbulenceclosuremodelandtransportequationsofsalinityandtemperature.Thesimulationforfloodinganddryingofmudflatshasbeenimproved.ThemodelisappliedtoXiamenwaters.Basedonextensivesurveydata,waterlevelelevation,temperatureandsalinityfieldalongtheeasternopenboundaryandattheJiulongRiverinletsandrunoffsareanalyzed,specifiedandcalibrated.Thecomputedresultsshowgoodagreementwiththemeasureddata,reproduceflooding,emergenceoflargeandcomplexmudflatregion.

简介：Basedonthehydrodynamicalfeatureandthetheoreticalvelocityprofilesoftidalflowandwind-inducedflowinshal-lowsea,acomputationalmodelisestablishedforthefirsttime,whichcanseparateobservedvelocityintotidalvelocityandwind-inducedvelocitybyuseoftheleastsquaremethod.Withthemodel,notonlythesurfacevelocitiesoftidalflowandwind-inducedflowareobtained,butalsothebedroughnessheightisdeterminedandthewindvelocityabovethewa-tersurfaceisestimated.Forverificationofthemodel,theobservedvelocityintheYellowRiverEstuaryandthelaborato-rytestisseparated,thenitisappliedtotheYangtzeRiverEstuary.Alltheresultsaresatisfactory.Theresearchresultsshowthatthemodelissimpleinmethod,feasibleinprocessandreasonableinresult.Themodelisavalidapproachtoanalysisandcomputationoffielddata,andcanbeappliedtoseparatetheobservedvelocityinshallowsea;atthesametime,reasonableboundaryconditionsofthesurfaceandbottomcanbeobtainedfortwo-andthree-dimensionalnumericalsimulation.

简介：Watermotioninestuarinewatersistheresultoftheactionofvariousdynamicfactors.Firstly,basedonthehydrodynamiccharacteristicsinestuarinewaters,neglectingthenonlineareffectsofvariousflowhydrodynamicfactors,thelogarithmvelocityprofileoftidalcurrentandthecubicvelocityprofileofHansenandRattray(1965)madeforlinearsuperpositionatasenseoffirstorder,anewmodelforvelocityprofileinestuarinewatersisestablished.Then,byintroducingtheleastsquaremethodcombinationofenumeration,thevelocityprofiledataofwind-drivencurrentmeasuredinthelaboratoryandthatobservedattheNorthandtheSouthBranchesoftheYangtzeEstuaryareverifiedandcomparedwithotherformulas,allwithsatisfactoryresults.Theresultsshowthatthenewmodelnotonlyconsiderstheinfluencesofvariousdynamicfactors,suchastide,windforce,run-offanddensitypressurewithhighaccuracy,butalsoprovidesreasonableboundaryconditionsonthebottomforhydrodynamicsnumericalsimulationinestuarinewaters.Thereby,theaccuracyandcredibilityofnumericalcomputationandpredictionofwaterflowareimproved.Theresearchistheoreticallyimportantfortheestuarinehydrodynamics.

简介：Forthesimulationofthenonlinearwavepropagationincoastalareaswithcomplexboundaries,anumericalmodelisdevelopedincurvilinearcoordinates.Inthemodel,theBoussinesq-typeequationsincludingthedissipationtermsareemployedasthegoverningequations.Inthepresentmodel,thedependentvariablesofthetransformedequationsarethefreesurfaceelevationandtheutilityvelocityvariables,insteadoftheusualprimitivevelocityvariables.TheintroductionofutilityvelocityvariableswhicharetheproductsofthecontravariantcomponentsofthevelocityvectorandtheJacobimatrixcanmakethetransformedequationsrelativelyconcise,thetreatmentoflateralboundaryconditionseasierandthedevelopmentoftheprogramsimpler.Thepredictor-correctormethodandfive-pointfinite-differenceschemeareemployedtodiscretizethetimederivativesandthespatialones,respectively.Thenumericalmodelistestedforthreecases.Itisfoundthatthenumericalresultsareingoodagreementwiththeanalyticalresultsandexperimentaldata.

简介：Mooringmodelexperimentandmooringlinetensiondeterminationareofsignificancetothedesignofmooringsystemsandberthingstructures.Thispapermainlyinvolves:(a)descriptionandanalysisofamooringmodelexperiment;(b)derivationofstaticequilibriumequationsforamooredshipsubjectedtowind,currentandwaves;(c)solutionofmo.oringequationswiththeMonteCarlomethod;(d)qualitativeanalysisofeffectsofpierpilesonmooringlineforces.Specialemphasisisplacedonthederivationofstaticequilibriumequations,solutionmethodandthemooringmodelexperiment.

简介：倾倒区域能力被水动力学过程主要影响(潮汐的沉积，暴风雨巨浪和波浪，等等)象倾倒区域的尺寸和深度一样。在作为FVCOM(有限体积海岸和海洋模型)知道的三维的海洋发行量模型和随机的动态统计分析模型上基于，利用倾倒地面地形学进化并且倾倒数量，讨论水动力学过程和倾倒的活动的影响的作者目的以便造了倾倒区域能力的海洋的一个新模型。与在倾倒的区域的深度和倾倒的数量的数据，底部的变化地志它基于FVCOM水动力学和沉积模块在自然条件下面由潮汐的电流引起了，为倾倒分析变化的统计关系的作者努力总计，潮汐的电流和底部地志。通过到合适的修订系数值，它将被认为是地志的真实数据改变引用波浪和暴风雨影响的价值澎湃。因此在倾倒的能力作为长期的变化拿这评估。在建立底部的阀值的前提地志的变化，倾倒的区域能力被计算。每年拿Yangtze河口号码1作为一个例子倾倒区域，作为由0.5m的水深度还原剂，倾倒的区域能力是模型结果在对实际数量的合理同意的大约670万m3/a,。然后，模型在海湾倾倒区域，Shengsishangchuan山倾倒区域，Dongding倾倒区域，Dongshan倾倒区域，和Wenzhou移植倾倒区域的Luoyuan被验证，它在外面是拐弯结果类似于实际观察的。

简介：

简介：First,Wirsching＇smodel,whichiswidelyemployedinfatiguereliabilityanlysisofmarineandoffshorestructures,isanalysedsystematically.Itisfoundthattheveryimportantrandomvariable△inWirsching＇smodelcannotbedirectlydeterminedfromfatigueexperimentbecauseoftheirreversibilityoffatiguetest,andinfact,whatWirschingstudiedfromtestingresultsisnot△butαofthestatisticalMiner＇srule.Second,byuseofthestatisticalMiner＇srule,amodifiedWirsching＇smodelisproposed.Thirdlyandmoreimportantly,basedonthetwo-dimensionalprobabilisticMiner＇srule,anewmodelisestablishedforfatiguereliabilityanalysisofstructuralcomponentssubjectedtospecifiedcyclicloadingofvariableamplitudeorstochastictimehistory.Intheend,anexampleispresented,fromwhichitwillbeseenthatthisnewmodelisveryconvenienttouseandfeasibletoengineeringpractice.

简介：-AringmodelisdevelopedtoinvestigatetheultimatestrengthoftubularXandXXjointsinthecasethatthebraceiscompressed.Inthepresentanalysis,thetubularjointismadeofelasto-perfectly-plasticmaterial,andthearchelementofthechordsectionintersectingwiththebraceisassumedtoberigid.Itisfoundthatwhen6plastichingesforXjointand8plastichingesTorXXjointappearinthering,thelimitstateisreached,andbymeansoftheequivalentringwidthBeformulaproposedinapreviouspaperbytheauthors,theultimatestrengthoftubularXandXXjointssubjectedtocompressioncanbeobtained.

简介：［1］CHENGShangmu,1990.Heat-Transferring,TheHigherEducationPublishingHouse,21～23,60～69,126～138.(inChinese)［2］CHENGYushenandFENGLuping,1998.Heat-TransferAnalysisandNumericalModelingofUnderwaterConcreteOilTank,OilJournal,9(2):117～126.(inChinese)［3］DaqinFieldScienceandResearchDesignInstitute,1975.DesignManualofOilandGasCollectandTransport,422～426,497～501.(inChinese)［4］HOUFusheng.EngineeringManualofOilRefining,OilIndustryPublishingHouse.［5］LUPeiqiong,1997.ResearchonHeat-TransferringofEasyCurdlingOilStorageinUnderwater,StorageandTransportofOilandGas,16(8):4～9.(inChinese)［6］TAOWensuan,1986.NumericalCalculationofHeatTransferring,Xi′AnJiaotongUniversityPublishingHouse,23～27,83～87.(inChinese)［7］ZHANGFenglu,1982.FiniteDifferenceMethodforHeat-TransferCalculation,MetallurgicalIndustryPublishingHouse,86～100,151～160.(inChinese)

简介：-Acombinednumericalmodelforcomputingmixingareasofpollutionverticaljetdischargingintotidalflowshasbeendeveloped.Thisnumericalmodeliscomposedofa2-Ddepth-averageddynamicfar-fieldnumericalmodelanda2-Dverticaldynamicnear-fieldnumericalmodel.Theformerusesfinitenodemethodtocomputevelocity,andimprovedfinitenodemethodtocomputepollutantconcentrationdistribution;thelatterisak-eturbulencemodel,andusesSIMPLE(Semi-ImplicitMethodforPressureLinkedEquations)methodtocomputevelocity.Atthesametime,theformerprovidesboundaryconditionsforthelatter.Thismodelcansimulatebothfar-fieldpollutantconcentrationdistributionandnear-fieldverticalrecirculationquicklyandprecisely.ThismodelhasbeenverifiedbymeasureddataofpollutantFoftheDachangreachoftheChangjingRiverandtestdatapresentedbyChenelal.(1992).Onthebasisofverification,theauthorsuseadesignedhydrographtocomputethismixingareaforacer

简介：Theradarechosignalofaseaclutterisnonlinear,nonstationaryandtimevarying.Amultifractalmeasureanalysiscandescribethelocalsingularityofaphysicssystem.Therandomwalkmodelofaseaclutterscatteringisanalysedtodisclosetheintrinsicphysicalcharacteristicsandlawsoftheseaclutter.Stochasticdifferentialequationsaregivenforthephysicalqualityoftheseaclutter.AdiffusionprocessmodelisestablishedusingItoformula.Thesingularityoftherandomwalkmodelistestedbyamultifractalspectroscopy,andtheaccuracyofthismodelisprovenbythemultifractalspectroscopyofareal-lifeIPIXradardataset.Thus,therandomwalkmodeliseffectivefordescribingthedynamicsmechanismoftheseaclutter.