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Statistics_of_Wave_Crest_Characteristics
维普资讯 ChinaOceanEngn/eern/g,Vo1.19,No.2,PP.2O5—214 ⑥2005ChinaOceanPress,ISSN0890-5487 YUDing—yong(于定勇)”,L0Dong-feng(吕东峰),Lt)Hua-qing(吕华庆) nadZHANGHan—yuan(张寒元) CollegeofEngineering,OceanUniversityofChina, 266071,China MarineScienceandTechnologySchool,ZhejiangOcenaUniverstiy,Zhoushan316004,China (Received30Octo~r2003;rceeivedrevisedform4December2004;acceptde30April2005) ABSTRACT 111estatisticaldistributionofwavecrestcharacteristicssuchascrestlength,crestheight,jointcrestheihgtnad lengthaleanalyzedbasedonnumericalsimulationof3.Drandomwaves.111eeffcetsofdirectionalfunctionsnadwave crestdefiningmethodsoncrestcharacteristicsa陀 alsostudide .111eresultsshowthatwavecrestsarenolongerUI~oFm andcontinuousindirectionalwavefield:htedistributionofcrestlengthisobviouslyinfluencde byhtedirectionalfunc. tion;htesattisticsofcresteharaeteristicsob~nde byhtetwodifferentmethodsalealmosthtesame. Keywords:random ; crest;directionfunctoin;rmmericalsimulatoin Oneofthemainreasonsforstudyingoceanwavesistoundemtandhteinteractionbetweenwaves andoceanstructures,commonlyofundinavarietyofoffshore,coastal,naval,nadenvironmental印一 plications.Forexample,ofrhtepredictionofthewaveloadsonverylargeflaotingstructures(VLFS), htecharacteristicsofwavecrestlengthmustbe includedbecauseofhteimpactof geometrynadsize. OneimportantpropertyofwavecoherencerelevnattoMobileOffshoreBase(MOB)designiswave “longcrestedness”.IfawavetravelingperpendiculartothelongdimensionofanMOBhasawave crestlongerthanhteplatform,rollmotionwillbe inducde.fIcrestsareshorterhtna htelongdimen— sion,torques willbe inducde .Thewavedynamicsofrsuchkindofstructuresisquitedifferentfrom thatofrtraditionaldesinging.Acutally,availablesutdieshav
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