简介：Aseriesofhydraulicmodeltestsarecarriedouttoinvestigaterandomwaverun-upandovertoppingonsmooth,impermeablesingleslopeandcompositeslope.Basedontheanalysisoftheinfluencesofwavesteepness,structureslope,incidentwaveangle,widthofthebermandwaterdepthonthebermandthewaverun-up,empiricalformulasforwaverun-upondikeareproposed.Moreover,empiricalformulaonestimatingthewaverun-uponcompositeslopewithmultiplebermsispresentedforpracticalapplicationofcomplexdikecross-section.Thepresentstudyshowsthattheinfluencefactorsforwaveovertoppingarealmostthesameasthoseforwaverun-upandthetrendofthewaveovertoppingvariationwithmaininfluenceparametersisalsosimilartothatforwaverun-up.Thetrendofthewaveovertoppingvariationscanbewelldescribedbytwomainfactors,i.e.thewaverun-upandthecrestfreeboardofthestructure.Anewpredictionmethodforwaveovertoppingisproposedforrandomwaves.Theproposedpredictionformulasareappliedtocasestudyofoverfortycasesandtheresultsshowthatthepredictionmethodsaregoodenoughforpracticaldesignpurposes.

简介：杰克起来，单位广泛地在在全世界钻工程正在起一个成功的作用，并且他们的安全和效率在研究和工程实践拿越来越多的吸引力。spudcan穿入深度的精确预言在决定杰克起来联合起来是否是可行的在这个地点操作是相当有帮助的。太大的穿入深度的预言可以在随后的抽取过程由于潜在的困难导致犹豫或甚至一个地点的拒绝；一样在操作期间由于可能的不稳定性的问题太小的深度预言是真的。然而，在预兆的结果之间的偏差和最后的地数据通常存在，特别当strong-over-soft土壤在阶层被包括时。最终的决定在很大程度上有时取决于实际经验，不是指南给的预兆的结果。它是有点危险的，但是没有选择。因此，特别在有strong-over-soft土壤侧面的阶层，为spudcan穿入深度的一个可行预兆的方法着急地被需要由杰克起来工业。鉴于这，预言spudcan穿入的方法上的全面调查被执行。为不同土壤侧面的类型，为spudcan穿入深度的预兆的方法被建议，并且相应实验也被进行验证这些方法。另外，验证建议方法的可行性推进，在华南海遇到的一个实际工程盒子是也介绍了，并且相应数字、试验性的结果也被介绍并且讨论。

简介：Thispaperdiscussestheeffectofbermwidthandelevationofcompositeslopeonirregularwaverun-up.Basedonthedataobtainedfrommodeltests,theformulaanddistributionofirregularwaverun-uponcompositeslopearederived.Thechangingofwindspeed,widthandelevationofthebermareconsideredcomprehensively.Thewaverun-upwithvariousexceedanceprobabilitycanbees-timatedutilizingthedistributioncurvesofirregularwaverun-up.

简介：Basedonthetimedependentmildslopeequationincludingtheeffectofwaveenergydissipation,anexpressionfortheenergydissipationfactorisderivedinconjunctionwiththewaveenergybalanceequation,andthenapracticalmethodforthesimulationofwaveheightandwaveset-upinnearshoreregionsispresented.Thevariationofthecomplexwaveamplitudeisnumericallysimulatedbyuseoftheparabolicmildslopeequationincludingtheeffectofwaveenergydissipationduetowavebreaking.Thecomponentsofwaveradiationstressarecalculatedsubsequentlybynewexpressionsforthemaccordingtotheobtainedcomplexwaveamplitude,andthenthedepth-averagedequationisappliedtothecalculationofwaveset-upduetowavebreaking.Numericalresultsareingoodagreementwithexperimentaldata,showingthattheexpressionfortheenergydissipationfactorisreasonableandthatthenewmethodiseffectiveforthesimulationofwaveset-upduetowavebreakinginnearshoreregions.

简介：Inthispaper,thefocusedwavegroupswithdifferentparametersandtheiractionsonaverticalcylinderareexperimentallystudied.Theharmonicwavecharacteristicsofthefocusingwavesareanalyzedbytheadditionandsubtractionofthecrestandtroughfocusingwaves.Theanalyzedresultsshowthathigherorderharmonicscanbegeneratedbecauseoftheinteractionofcomponentwaves.Nonlinearityincreaseswiththeinputtedwaveamplitudeandthefrequencywidthincrement.Further,thewaverun-uparoundtheverticalcircularcylinderisexperimentallystudied.Itincreaseswiththewavesteepnessandtherelativecylinderdiameterincrease.However,thevariationsofwaverun-uparoundthecircularcylinderaredifferent.Theresearchesprovideareferenceforfurthernumericalstudies.

简介：

简介：Animpedanceanalyticalmethod(IAM)isdevelopedtostudytheinteractionofplanewaterwavewithaslotted-wallcaissonbreakwater.Thenon-linearboundaryconditionattheslotted-wallisexpressedintermsofflowresistance.Asetofalgebraicexpressionsareobtainedforfreesurfaceelevationinsideandoutsidechamber,andreflectioncoefficient.Thepredictionofthereflectioncoefficientsshowsthattherelativewidthsofthechamberinducingtheminimumreflectioncoefficientforaslotted-wallcaissonbreakwaterareinarangeof0.10～0.20,whicharesmallerthanthat(0.15～0.25)foraperforated-wallcaissonbreakwater.Thereflectioncoefficientsandfreesurfaceelevationobtainedbythepresentmodelarecomparedwiththatoflaboratoryexperimentscarriedoutbypreviousresearchers.

简介：

简介：Theproceduresofultrasonicextractionandclean-upwereoptimizedforthedeterminationofpolycyclicaromatichydrocarbons(PAHs)inmarinesediments.Sampleswereultrasonicallyextracted,andtheextractswerepurifiedwithaminiaturizedsilicagelchromatographiccolumnandanalyzedwithhighperformanceliquidchromatography(HPLC)withafluorescencedetector.Ultrasonicationwithmethanol-dichloromethane(2:1,v/v)mixturegavehigherextractionefficiencythanthatwithdichloromethane.Amongthethreeelutionsolventsusedinclean-upstep,dichloromethane-hexane(2:3,v/v)mixturewasthemostsatisfactory.Undertheoptimizedconditions,therecoveriesintherangeof54.82%to94.70%withRSDsof3.02%to23.22%foraspikedblank,andintherangeof61.20%to127.08%withRSDsof7.61%to26.93%foraspikedmatrix,wereobtainedforthe15PAHsstudied,whiletherecoveriesforaNISTstandardreferenceSRM1941bwereintherangeof50.79%to83.78%withRSDsof5.24%to21.38%.Thedetectionlimitswerebetween0.75ngL-1and10.99ngL-1fordifferentPAHs.AsamplefromtheJiaozhouBayareawasexaminedtotesttheestablishedmethods.