Field observations of shear waves in the surf zone Noyes, T. James Guza, R. T. Elgar, Steve Herbers, T. H. C. 2010-06-18T15:21:52Z 2010-06-18T15:21:52Z 2004-01-31
dc.description Author Posting. © American Geophysical Union, 2004. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 109 (2004): C01031, doi:10.1029/2002JC001761. en_US
dc.description.abstract Alongshore propagating meanders of the mean alongshore current in the surf zone called shear waves have periods of a few minutes and wavelengths of a few hundred meters. Here shear wave properties are estimated with arrays of current meters deployed for 4 months within 300 m of the shoreline of a sandy beach. Shear wave velocity fluctuations are approximately horizontally isotropic, with root mean square values between 10 and 40% of the mean (3-hour-averaged) alongshore current V. Cross-shore variations of the time-averaged shear wave momentum flux are consistent with shear wave energy generation close to shore where the breaking wave-driven mean alongshore current V and current shear Vx are strong and with shear wave energy dissipation and transfer back to the mean flow farther offshore where V and Vx are weak. In case studies where V is a narrow jet near the shoreline the observed strong decay of shear wave energy levels seaward of the jet, and the cross-shore and alongshore structure of shear waves within the jet, are similar to predictions based on the linearly unstable modes of the observed V. Shear wave energy levels also are high in a marginally unstable case with a strong, but weakly sheared, V. en_US
dc.description.sponsorship This research was supported by the Office of Naval Research, the National Ocean Partnership Program and the National Science Foundation. en_US
dc.format.mimetype application/pdf
dc.identifier.citation Journal of Geophysical Research 109 (2004): C01031 en_US
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.subject Shear waves en_US
dc.subject Longshore currents en_US
dc.subject Surf zone en_US
dc.title Field observations of shear waves in the surf zone en_US
dc.type Article en_US
dspace.entity.type Publication
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