Chapter
Dec 31, 2015
Wave Group Property of Wind Waves from Modulational Instability
Authors: Hajime Mase and Yuichi Iwagaki, M.ASCEAuthor Affiliations
Publication: Coastal Engineering 1986
Abstract
This paper discusses wave grouping of wind waves from the physical viewpoint of wave modulational instability. Amplitude modulation periods obtained from the smoothed instantaneous wave energy history (SIWEH) of the observed data are compared with the predicted values by the modulational instability theory using the Zakharov equation for a finite constant water depth derived by Stiassnie and Shemer (1984). The modulation period normalized by the typical wave period corresponds to the length of total run. It is shown that the amplitude modulation periods of the observed data agree satisfactorily with the predicted values. Thus we conclude that the modulational instability is a hydrodynamical cause of grouping of high waves.
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Published In
Coastal Engineering 1986
Pages: 565 - 577
Copyright
© 1987 American Society of Civil Engineers.
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Published online: Dec 31, 2015
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Hajime Mase
Research Associate, Department of Civil Engineering, Kyoto University, Kyoto, 606, Japan
Yuichi Iwagaki, M.ASCE
Professor, Department of Civil Engineering, Kyoto University, Kyoto, 606, Japan
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ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.