Nonlinear generation and loss of infragravity wave energy
Henderson, Stephen M.
Guza, R. T.
Herbers, T. H. C.
Bowen, A. J.
MetadataShow full item record
Nonlinear energy transfers with sea and swell (frequencies 0.05–0.40 Hz) were responsible for much of the generation and loss of infragravity wave energy (frequencies 0.005–0.050 Hz) observed under moderate- and low-energy conditions on a natural beach. Cases with energetic shear waves were excluded, and mean currents, a likely shear wave energy source, were neglected. Within 150 m of the shore, estimated nonlinear energy transfers to (or from) the infragravity band roughly balanced the divergence (or convergence) of the infragravity energy flux, consistent with a conservative energy equation. Addition of significant dissipation (requiring a bottom drag coefficient exceeding about 10−2) degraded the energy balance.
Author Posting. © American Geophysical Union, 2006. 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 111 (2006): C12007, doi:10.1029/2006JC003539.
Showing items related by title, author, creator and subject.
Thomson, James M.; Elgar, Steve; Raubenheimer, Britt; Herbers, T. H. C.; Guza, R. T. (American Geophysical Union, 2006-03-01)The strong tidal modulation of infragravity (200 to 20 s period) waves observed on the southern California shelf is shown to be the result of nonlinear transfers of energy from these low-frequency long waves to ...
Ciriano, Yolanda; Coco, Giovanni; Bryan, K. R.; Elgar, Steve (American Geophysical Union, 2005-02-22)Fluid flows consistent with low-mode edge waves were evident in video observations of swash motions during a field experiment in which beach cusps developed on an initially smooth beach. As beach cusps grew, energy lying ...
Thomson, James M.; Elgar, Steve; Herbers, T. H. C.; Raubenheimer, Britt; Guza, R. T. (American Geophysical Union, 2007-10-10)The propagation of infragravity waves (ocean surface waves with periods from 20 to 200 s) over complex inner shelf (water depths from about 3 to 50 m) bathymetry is investigated with field observations from the southern ...