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Spectral form and source term balance of short gravity wind waves
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
2014 (English)In: Journal Of Geophysical Research - Oceans, ISSN 2169-9275, Vol. 119, no 11, 7406-7419 p.Article in journal (Refereed) Published
Abstract [en]

We investigated the spectral structure and source term balance of short gravity waves, based on in situ observations of wave number spectra retrieved by air-sea interaction spar (ASIS) buoys. The behaviors of wave number spectra up to 10 rad/m (the gravity wave regime) were analyzed for a wide range of wind and wave conditions. The observed wave number spectra showed the spectral power laws described by Toba (1973) and Phillips (1958) in addition to the characteristic nodal point at approximate to 10 rad/m where spectral energy becomes constant over the entire wind speed range. We also improved the third-generation wave model using the nonlinear dissipation term. The wave model reproduced the spectral form in the higher wave number domain. In the equilibrium range, nonlinear transfer played a major role in maintaining equilibrium conditions. On the other hand, in the saturation range, which starts at the upper limit of the equilibrium range, the nonlinear transfer tended to be out of balance with other source terms, and the dissipation term was in balance with wind input.

Key Points <list id="jgrc20940-list-0001" list-type="bulleted"> <list-item id="jgrc20940-li-0001">We investigated the characteristics of short gravity wind waves <list-item id="jgrc20940-li-0002">The observed wave number spectra showed the spectral power laws <list-item id="jgrc20940-li-0003">The nonlinear dissipation term significantly improved the model results.

Place, publisher, year, edition, pages
2014. Vol. 119, no 11, 7406-7419 p.
Keyword [en]
ocean surface waves, short gravity waves, spectral form, source term balance
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-240241DOI: 10.1002/2014JC009869ISI: 000346102900002OAI: oai:DiVA.org:uu-240241DiVA: diva2:776246
Available from: 2015-01-07 Created: 2015-01-06 Last updated: 2015-01-07Bibliographically approved

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Sahlée, Erik

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