Nonlinear generation and loss of infragravity wave energy

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Date
2006-12-08
Authors
Henderson, Stephen M.
Guza, R. T.
Elgar, Steve
Herbers, T. H. C.
Bowen, A. J.
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DOI
10.1029/2006JC003539
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Keywords
Infragravity waves
Nearshore
Nonlinear waves
Abstract
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.
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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.
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Journal of Geophysical Research 111 (2006): C12007
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