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

Peter H. Dahl; Jee Woong Choi; Neil J. Williams; Hans C. Graber

doi:10.1121/1.2963096

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

Peter H. Dahl, Jee Woong Choi, Neil J. Williams, Hans C. Graber

Ocean Sciences

Research output: Contribution to journal › Article › peer-review

20 Scopus citations

Abstract

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 1-20 kHz, 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 10-13 ms. Simultaneous measures of wind speed made within 1.5 and 11 km of the open water experimental location differed by 2 ms in their respective 30 min average; this has cautionary implications for empirical models for bubble attenuation that are a strong function of wind speed.

Original language	English (US)
Pages (from-to)	EL163-EL169
Journal	Journal of the Acoustical Society of America
Volume	124
Issue number	3
DOIs	https://doi.org/10.1121/1.2963096
State	Published - 2008

ASJC Scopus subject areas

Arts and Humanities (miscellaneous)
Acoustics and Ultrasonics

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title = "Field measurements and modeling of attenuation from near-surface bubbles for frequencies 1-20 kHz",

abstract = "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 1-20 kHz, 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 10-13 ms. Simultaneous measures of wind speed made within 1.5 and 11 km of the open water experimental location differed by 2 ms in their respective 30 min average; this has cautionary implications for empirical models for bubble attenuation that are a strong function of wind speed.",

author = "Dahl, {Peter H.} and Choi, {Jee Woong} and Williams, {Neil J.} and Graber, {Hans C.}",

note = "Funding Information: This research was supported by the Office of Naval Research. The first author acknowledges the data from the temperature mooring used for simulation, made available courtesy of the Woods Hole Oceanographic Institution, Ocean Acoustics Laboratory.",

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AU - Dahl, Peter H.

AU - Choi, Jee Woong

AU - Williams, Neil J.

AU - Graber, Hans C.

N1 - Funding Information: This research was supported by the Office of Naval Research. The first author acknowledges the data from the temperature mooring used for simulation, made available courtesy of the Woods Hole Oceanographic Institution, Ocean Acoustics Laboratory.

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N2 - 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 1-20 kHz, 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 10-13 ms. Simultaneous measures of wind speed made within 1.5 and 11 km of the open water experimental location differed by 2 ms in their respective 30 min average; this has cautionary implications for empirical models for bubble attenuation that are a strong function of wind speed.

AB - 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 1-20 kHz, 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 10-13 ms. Simultaneous measures of wind speed made within 1.5 and 11 km of the open water experimental location differed by 2 ms in their respective 30 min average; this has cautionary implications for empirical models for bubble attenuation that are a strong function of wind speed.

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

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