Accession Number : ADA262718


Title :   Observations of Turbulence in the Surf Zone


Descriptive Note : Final rept. 1 Oct 1988-30 Sep 1992,


Corporate Author : SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA CENTER FOR COASTAL STUDIES


Personal Author(s) : George, Ron ; Flick, Reinhard E ; Guza, R T


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a262718.pdf


Report Date : Mar 1993


Pagination or Media Count : 36


Abstract : The turbulence generated by waves breaking on a natural beach is examined using hotfilm anemometer data. Turbulence intensity is estimated from the dissipation rate and an appropriate length scale (a fraction of the water depth). The dissipation rates are determined from wavenumber spectra found by applying Taylor's hypothesis to frequency spectra of short (1/8s) hotfilm time series. The resulting Froude-scaled turbulence intensities are relatively uniform throughout the water column and are similar in vertical structure but lower in magnitude than in existing laboratory studies. The magnitudes of the turbulence intensity observed in both the field and laboratory are consistent with an existing macroscopic model of bore dissipation in the surf zone. Scaling by this bore model relates turbulence intensity levels of monochromatic waves in small-scale laboratory experiments to random waves in the natural surf zone.... Surfzone, Turbulence, Wave breaking, Wave dissipation.


Descriptors :   *OCEAN WAVES , *TURBULENCE , *SURF , *OCEANOGRAPHY , MODELS , INTENSITY , DEPTH , SPECTRA , LENGTH , LABORATORIES , ANEMOMETERS , FROUDE NUMBER , BORES , HOT WIRE ANEMOMETERS , BEACHES , NAVAL RESEARCH , SCALE , REGIONS , TIME SERIES ANALYSIS , RATES , DISSIPATION


Subject Categories : Physical and Dynamic Oceanography


Distribution Statement : APPROVED FOR PUBLIC RELEASE