波群間相互作用對波高分布影響的研究.pdf

1、中國海洋大學碩士學位論文波群間相互作用對波高分布影響的研究姓名：李永全申請學位級別：碩士專業(yè)：物理海洋學指導教師：文凡20110603IIStudyontheeffectofwavegroupinteractiononthedistributionofwaveheightAbstractResearchontheoceanwavegroupisimptantfoceanwavetheyoceanengineering.Researcho

2、noceanwavenonlinearityisanimptantrealmofoceanwavestudy.Thenonlinearwavewaveinteractionsarestudiedintensively.Howeververyfewstudieshavebeenmadeontheinfluenceofwavegroupinteractiononthedistributionofwaveheight.Resultsofman

3、ytheeticalresearchesshowthattheevolvementofwavegroupenvelopeiscontrolledbynonlinearSchrdingerequation(NLS).InthecaseoftwowavegroupstheevolutionoftheenvelopecanbedescribedbytwocouplednonlinearSchrdingerequations(CNLS).Thi

4、smeansthattheinteractionbetweenwavegroupenvelopescanbestudiedintheframewkofCNLS.Thewindwavefieldshouldbetreatedassuperpositionofmanykindsofsimplewavegroups.TheinteractionoftwowavegroupsisstudiedonthebasisofCNLS.Itisfound

5、thatwavegroupinteractionmaycausethedeviationofwaveheightdistributionfromtheresultoflinearthey.Flowmediumwaveheightsinthecaseofnonlinearitytheprobabilityofexceedenceishigherthantheresultoflinearity.Fwaveswithlargeheightin

6、thecaseofnonlinearitytheprobabilityofexceedenceislowerthantheresultoflinearity.Fromaveragewaveheightto1.5timesthisheightisthetransitionregion.Aparameterisintroducedinstudyingtheinfluenceofwavegroupinteractiononwaveheight

7、distribution.Itisameasureoftheeffectofnonlinearityonthedistribution.TheresultsshowthatflargervaluesofthisparameterflargervaluesoftheaveragesteepnessthedeviationofthedistributionfromtheresultoflinearityislargerTheresultis

8、inconsistencywiththatofwindwaveexperiment.Theparameterintroducedintheypartcrespondstotheratioofrightregionareatoleftregionareainaspectrum.Itisameasureoftheeffectofnonlinearityonthedistribution.Fwindwavesthisparameterrefl

9、ectstheshapeofthespectrum.Thespectralshapeisfoundtobeanimptantfactininfluencingthedistributionofwaveheight.Theresultsofwaveheightdistributionfsimulatedwavesshowthatthedeviationsofthewaveheightdistributionofnonlinearityfr

10、omlinearityarecausedbynonlinearity.Theimplicationoftheseresultsisthatthespectralshapeisanimptantfactonthedistributionofwaveheightspectralshapeparametersshouldbecontainedinthedistributioninfuturestudies.Keywds:wavegroupwa