Field measurements and modeling of attenuation from near-surface bubbles for frequencies 1–20kHz

Measurements of excess attenuation from near-surface bubbles from the Shallow Water '06 experiment are reported. These are transmission measurements made over the frequency range 1–20kHz, and they demonstrate a frequency, grazing angle, and wind speed dependence in attenuation. Data modeling po...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2008-09, Vol.124 (3), p.EL163-EL169
Main Authors: Dahl, Peter H., Choi, Jee Woong, Williams, Neil J., Graber, Hans C.
Format: Article
Language:English
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Summary:Measurements of excess attenuation from near-surface bubbles from the Shallow Water '06 experiment are reported. These are transmission measurements made over the frequency range 1–20kHz, and they demonstrate a frequency, grazing angle, and wind speed dependence in attenuation. Data modeling points to bubble void fractions of order 10−6 in effect for wind speeds 10–13m∕s. Simultaneous measures of wind speed made within 1.5 and 11km of the open water experimental location differed by 2m∕s in their respective 30min average; this has cautionary implications for empirical models for bubble attenuation that are a strong function of wind speed.
ISSN:0001-4966
1520-8524
DOI:10.1121/1.2963096