Vertical structure of dissipation in the nearshore


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dc.contributor.author Feddersen, Falk
dc.contributor.author Trowbridge, John H.
dc.contributor.author Williams, Albert J.
dc.date.accessioned 2010-12-02T15:25:46Z
dc.date.available 2010-12-02T15:25:46Z
dc.date.issued 2007-07
dc.identifier.citation Journal of Physical Oceanography 37 (2007): 1764-1777 en_US
dc.identifier.uri http://hdl.handle.net/1912/4152
dc.description Author Posting. © American Meteorological Society, 2007. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 37 (2007): 1764-1777, doi:10.1175/jpo3098.1. en_US
dc.description.abstract The vertical structure of the dissipation of turbulence kinetic energy was observed in the nearshore region (3.2-m mean water depth) with a tripod of three acoustic Doppler current meters off a sandy ocean beach. Surface and bottom boundary layer dissipation scaling concepts overlap in this region. No depth-limited wave breaking occurred at the tripod, but wind-induced whitecapping wave breaking did occur. Dissipation is maximum near the surface and minimum at middepth, with a secondary maximum near the bed. The observed dissipation does not follow a surfzone scaling, nor does it follow a “log layer” surface or bottom boundary layer scaling. At the upper two current meters, dissipation follows a modified deep-water breaking-wave scaling. Vertical shear in the mean currents is negligible and shear production magnitude is much less than dissipation, implying that the vertical diffusion of turbulence is important. The increased near-bed secondary dissipation maximum results from a decrease in the turbulent length scale. en_US
dc.description.sponsorship Funding was provided by NSF and ONR. en_US
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.publisher American Meteorological Society en_US
dc.relation.uri http://dx.doi.org/10.1175/jpo3098.1
dc.subject Turbulence en_US
dc.subject Kinetic energy en_US
dc.subject Ocean en_US
dc.title Vertical structure of dissipation in the nearshore en_US
dc.type Article en_US
dc.identifier.doi 10.1175/jpo3098.1

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