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dc.contributor.advisorStanton, Timothy P.
dc.contributor.advisorThornton, Edward B.
dc.contributor.authorPiret, R. J.
dc.date.accessioned2012-08-09T19:24:42Z
dc.date.available2012-08-09T19:24:42Z
dc.date.issued1999-12
dc.identifier.urihttp://hdl.handle.net/10945/9153
dc.descriptionApproved for public release; distribution is unlimited.en_US
dc.description.abstractBubble injection due to breaking waves within the surf zone is inferred by measuring void fraction using a 3 m vertical array of eight conductivity cells in conjunction with video pixel intensity. Void fraction errors associated with the conductivity measurements are examined, including vertical variations in the temperature and conductivity (measured), proximity effects near the surface, and estimates of the surface elevation using pressure sensors. Energy loss is due to conversion of kinetic and potential energy of a wave to buoyant potential energy by the injection of air into the water column, which is then lost as the bubbles raise to the surface and escape to the atmosphere. Void fractions up to 40% were observed in intense breaking events penetrating to depths over 0.5 m confined within the crest trough region. Production of potential energy due to buoyancy of bubbles was nearly instantaneous with the majority of energy dissipating within 0.25 s. Pixel intensity qualitatively correlated with surface elevation and injection events. Crests in cross shore intensity time stack plots are clearly visible and show good correlation with breaking events. However, pixel intensity values did not correlate quantitatively with surface elevation or production of buoyant potential energyen_US
dc.description.urihttp://www.archive.org/details/voidfractionunde00pire
dc.format.extentx, 41 p.;28 cm.en_US
dc.language.isoen_US
dc.publisherMonterey, California. Naval Postgraduate Schoolen_US
dc.titleVoid fraction under breaking wavesen_US
dc.typeThesisen_US
dc.subject.authorBubble Injectionen_US
dc.subject.authorVoid Fractionen_US
dc.subject.authorEnergy Dissipationen_US
dc.subject.authorVideo Pixel Intensityen_US
dc.description.serviceLieutenant, United States Navyen_US
etd.thesisdegree.nameM.S. in Meteorology and Physical Oceanographyen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.disciplineMeteorology and Physical Oceanographyen_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US


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