Normal-mode sound propagation in an ocean with sinusoidal surface waves

Anand, G. V. ; George, Mathews K. (1986) Normal-mode sound propagation in an ocean with sinusoidal surface waves Journal of the Acoustical Society of America, 80 (1). pp. 238-243. ISSN 0001-4966

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Official URL: http://asadl.org/jasa/resource/1/jasman/v80/i1/p23...

Related URL: http://dx.doi.org/10.1121/1.394179

Abstract

The normal-mode solution to the problem of acoustic wave propagation in an isovelocity ocean with a wavy surface is considered. The surface wave amplitude is assumed to be small compared to the acoustic wavelength, and the method of multiple scales is employed to study the interaction between normal-mode acoustic waves and the surface waves. A nonresonant interaction causes small fluctuations of the amplitude and phase of the acoustic wave at a rate dependent on the frequency of the surface wave. Backscatter occurs if the wavenumber of the surface wave is larger than that of the acoustic wave. The interaction becomes resonant if appropriate phase-matching conditions are satisfied. In this case, two acoustic normal modes get coupled, resulting in a large-scale periodic exchange of energy from one mode to another.

Item Type:Article
Source:Copyright of this article belongs to American Institute of Physics.
Keywords:Seas; Sound Waves; Wave Propagation; Normal-mode Analysis; Surfaces
ID Code:71977
Deposited On:28 Nov 2011 05:00
Last Modified:28 Nov 2011 05:00

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