Statistics_of_Wave_Crest_Characteristics.pdf

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