Accession Number : AD1031038

Title :   Wave-Breaking Turbulence in the Ocean Surface Layer

Descriptive Note : Journal Article

Corporate Author : Naval Research Laboratory Stennis Space Center United States

Personal Author(s) : Thomson,Jim ; Schwendeman,Michael S ; Zippel,Seth F ; Moghimi,Saeed ; Gemmrich,Johannes ; Rogers,W E

Full Text :

Report Date : 01 Jun 2016

Pagination or Media Count : 14

Abstract : Observations of winds, waves, and turbulence at the ocean surface are compared with several analytic formulations and a numerical model for the input of turbulent kinetic energy by wave breaking and the subsequent dissipation. The observations are generally consistent with all of the formulations, although some differences are notable at winds greater than 15ms21. The depth dependence of the turbulent dissipation rate beneath the waves is fit to a decay scale, which is sensitive to the choice of vertical reference frame. In the surface-following reference frame, the strongest turbulence is isolated within a shallow region of depths much less than one significant wave height. In a fixed reference frame, the strong turbulence penetrates to depths that are at least half of the significant wave height. This occurs because the turbulence of individual breakers persists longer than the dominant period of the waves and thus the strong surface turbulence is carried from crest to trough with the wave orbital motion.

Descriptors :   wave power , dissipation , kinetic energy , surface waves , turbulence , wind

Subject Categories : Physical and Dynamic Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE