Accession Number : ADA536936


Title :   Semiempirical Dissipation Source Functions for Ocean Waves. Part 1: Definition, Calibration, and Validation


Descriptive Note : Journal article


Corporate Author : NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV


Personal Author(s) : Ardhuin, Fabrice ; Rogers, Erick ; Babanin, Alexander V. ; Filipot, Jean-Francois ; Magne, Rudy ; Roland, Aaron ; van der Westhuysen, Andre ; Queffeulou, Pierre ; Lefevre, Jean-Michel ; Aouf, Lotfi ; Collard, Fabrice


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA536936


Report Date : SEP 2010


Pagination or Media Count : 26


Abstract : New parameterizations for the spectral dissipation of wind-generated waves are proposed. The rates of dissipation have no predetermined spectral shapes and are functions of the wave spectrum and wind speed and direction, in a way consistent with observations of wave breaking and swell dissipation properties. Namely, the swell dissipation is nonlinear and proportional to the swell steepness, and dissipation due to wave breaking is nonzero only when a nondimensional spectrum exceeds the threshold at which waves are observed to start breaking. An additional source of short-wave dissipation is introduced to represent the dissipation of short waves due to longer breaking waves. A reduction of the wind-wave generation of short waves is meant to account for the momentum flux absorbed by longer waves. These parameterizations are combined and calibrated with the discrete interaction approximation for the nonlinear interactions. Parameters are adjusted to reproduce observed shapes of directional wave spectra, and the variability of spectral moments with wind speed and wave height. Some systematic defects are still present, but, overall, the parameterizations probably yield the most accurate estimates of wave parameters to date.


Descriptors :   *OCEAN WAVES , CALIBRATION , DISSIPATION , REPRINTS , WIND


Subject Categories : PHYSICAL AND DYNAMIC OCEANOGRAPHY


Distribution Statement : APPROVED FOR PUBLIC RELEASE