简介：AgeopulseseismicsystemwasimplementedtoobtainnewinformationonunderlyingstratabeneaththeYellowRiverDelta.However,owingtotheslippingofseafloorandshallowwater(<25m),freesurface-relatedmultiplesareconflictedwiththeflatprimaries,whichmayinstructtheinterpretersinawrongwayandmakewrongconclusions.Owingtothevariationofmultipleperiods,standardanti-multipletechniquesmaylosetheirpower,suchaspredictivedeconvolution.Surface-relatedmultipleeliminationmethodsareintroducedtoattenuatethemultiplesbasedontheunderlyingwave-equationprinciples.Theresultsjustifiedthemethodonthesingle-channelgeopulseprofile,revealingtherealnatureofthesubsurface.

简介：Estuarineprocessesinthearcticlagoonsareamongtheleaststudiedbutimportantsubjects,especiallyconsideringtherapidwarmingofarcticwaterwhichmaychangethelengthofice-freeperiodinthesummer.Inthispaper,wind-drivenexchangeflowsinthemicro-tidalElsonLagoonofnorthernAlaskawithmultipleinletsofcontrastingwidthsanddepthsarestudiedwithinsituobservations,statisticalanalysis,numericalexperiments,aregressionmodelonthebasisofdynamics,andremotesensingdata.WatervelocityprofileswereobtainedfromabottomdeployedacousticDopplercurrentprofiler(ADCP)inthenorthwesternEluitkakPassconnectingtheBeaufortSeatotheElsonLagoonduringa4.9dayice-freeperiodinthesummerof2013.Thesubtidalflowisfoundcorrelatedwithwind(R~2value~96%).Frequentlyoccurringeast,northeastandnorthwindsfromthearcticatmospherichigh-andlow-pressuresystemspushwaterfromtheBeaufortSeaintothelagoonthroughthewideinletsontheeasternsideofthelagoon,resultinginanoutwardflowagainstthewindatthenarrownorthwesterninlet.Thecounter-windflowisaresultofanunevenwindforcingactingthroughtheasymmetricinletsanddepth,aneffectof'torque'orvorticity.Undernorthwestwind,theexchangeflowatthenorthwesterninletreversesitsdirection,withinwardflowsthroughtheupwindnorthwesterninletandoutwardflowsthroughthedownwindeasterninlets.AregressionmodelisestablishedbasedonthemomentumequationsandTaylorseriesexpansions.ThemodelisusedtopredictflowsinJulyandAugustof2015andJulyof2017,supportedbyavailableLandsatsatelliteimages.About73%–80%ofthetimetheflowsatEluitkakPassareoutofElsonLagoonforthesummerof2015and2017.Numericalexperimentsareconductedtocorroboratethefindingsandillustratetheeffectsundervariouswindconditions.Aquasi-steadystatebalancebetweenwindforceandsurfacepressuregradientisconfirmed.

简介：Thesurface-relatedmultipleelimination(SRME)methodisbasedonfeedbackformulationandhasbecomeoneofthemostpreferredmultiplesuppressionmethodsused.However,somedifferencesareapparentbetweenthepredictedmultiplesandthoseinthesourceseismicrecords,whichmayresultinconventionaladaptivemultiplesubtractionmethodsbeingbarelyabletoeffectivelysuppressmultiplesinactualproduction.ThispaperintroducesacombinedadaptivemultipleattenuationmethodbasedontheoptimizedeventtracingtechniqueandextendedWienerfiltering.ThemethodfirstlyusesmultiplerecordspredictedbySRMEtogenerateamultiplevelocityspectrum,thenseparatestheoriginalrecordtoanapproximateprimaryrecordandanapproximatemultiplerecordbyapplyingtheoptimizedeventtracingmethodandshort-timewindowFKfilteringmethod.AfterapplyingtheextendedWienerfilteringmethod,residualmultiplesintheapproximateprimaryrecordcanthenbeeliminatedandthedamagedprimarycanberestoredfromtheapproximatemultiplerecord.ThismethodcombinestheadvantagesofmultipleeliminationbasedontheoptimizedeventtracingmethodandtheextendedWienerfilteringtechnique.Itisanidealmethodforsuppressingtypicalhyperbolicandothertypesofmultiples,withtheadvantageofminimizingdamageoftheprimary.Syntheticandfielddatatestsshowthatthismethodproducesbettermultipleeliminationresultsthanthetraditionalmulti-channelWienerfiltermethodandismoresuitableformultipleeliminationincomplicatedgeologicalareas.

简介：这份报纸涉及搬到领导人追随者形成的多重underactuated表面容器的形成控制问题。形成被追随者完成追踪相对领导人定义的一个虚拟目标。追踪法律的一个柔韧的适应目标被使用神经网络和backstepping技术建议。建议控制计划的优点是不明确的非线性的动力学由Coriolis/centripetal力量引起了，非线性的抑制，从环境的unmodeled水动力学和骚乱能被补偿由在线学习上。把分析基于Lyapunov，追踪的错误集成到起源的一位小邻居的建议控制器保证。模拟结果表明控制策略的有效性。

简介：Typhoon-generatedwavesaresimulatedwithtwonumericalwavemodels,theSWANmodelforthecoastalandYangtzeEstuarydomain,nestedwithintheWAVEWATCHIII(WW3)forthebasin-scaleEastChinaSeadomain.TyphoonNo.8114ischosenbecauseitwasverystrong,andgeneratedhighwavesintheEstuary.WW3wasimplementedfortheEastChinaSeacoarse-resolutioncomputationaldomain,tosimulatethewavesoveralargespatialscaleandprovideboundaryconditionsforSWANmodelsimulations,implementedonafine-resolutionnesteddomainfortheYangtzeEstuaryarea.TheTakahashiwindmodelisappliedtothesimulationoftheEastChinaSeascale(3-hourly)andYangtzeEstuaryscale(1-hourly)winds.SimulationsofsignificantwaveheightsintheEastChinaSeashowthatthehighestwavesareontherightsideofthestormtrack,andmaximatendtooccurattheeasterndeep-wateropenboundaryoftheYangtzeEstuary.IntheYangtzeEstuary,incomingswellisdominantoverlocallygeneratedwavesbeforethetyphoonapproachestheEstuary.AsthetyphoonapproachestheEstuary,windwavesandswellcoexist,andthewavedirectionismainlyinfluencedbytheswelldirectionandthecomplextopography.