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Observation of sound focusing and defocusing due to propagating nonlinear internal waves.

Authors
Type
Published Article
Journal
The Journal of the Acoustical Society of America
1520-8524
Publication Date
Volume
124
Issue
3
Identifiers
DOI: 10.1121/1.2963087
PMID: 19045564
Source
Medline
License
Unknown

Abstract

Fluctuations of the low frequency sound field in the presence of an internal solitary wave packet during the Shallow Water '06 experiment are analyzed. Acoustic, environmental, and on-board ship radar image data were collected simultaneously before, during, and after a strong internal solitary wave packet passed through the acoustic track. Preliminary analysis of the acoustic wave temporal intensity fluctuations agrees with previously observed phenomena and the existing theory of the horizontal refraction mechanism, which causes focusing and defocusing when the acoustic track is nearly parallel to the front of the internal waves [J. Acoust. Soc. Am., 122(2), pp. 747-760 (2007)].

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