Resonant interaction of acoustic waves with subaqueous bedforms: Sand dunes in the South China Sea

The large subaqueous sand dunes in the South China Sea are expected to produce the coupling of energy between acoustic normal modes. In this letter, resonant interaction between acoustic propagating modes and subaqueous bedforms are numerically investigated as a function of bedform wavelength, acous...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2015-12, Vol.138 (6), p.EL515-EL521
Main Authors: Chiu, Linus Y S, Chang, Andrea Y Y, Reeder, D Benjamin
Format: Article
Language:English
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Summary:The large subaqueous sand dunes in the South China Sea are expected to produce the coupling of energy between acoustic normal modes. In this letter, resonant interaction between acoustic propagating modes and subaqueous bedforms are numerically investigated as a function of bedform wavelength, acoustic frequency and bedform packet length. The results demonstrate that bedform wavelength impacts acoustic mode coupling behavior, with the principal transfer of energy occurring between acoustic modes whose eigenvalue difference is equal to the peak value in the bedform wavenumber spectrum. The observed effect of wavelength is greater than that of acoustic frequency and bedform packet length.
ISSN:0001-4966
1520-8524
DOI:10.1121/1.4937746