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High-frequency wind-driven ambient noise in shallow brackish water: measurements and spectra.

Authors
  • Poikonen, Ari Antti
Type
Published Article
Journal
The Journal of the Acoustical Society of America
Publication Date
Nov 01, 2010
Volume
128
Issue
5
Identifiers
DOI: 10.1121/1.3488589
PMID: 21110533
Source
Medline
License
Unknown

Abstract

Ambient noise measurements were carried out in shallow brackish water within a frequency range extending up to 70 kHz. The high-frequency spectral slopes become steeper above 10 kHz at intermediate and high wind speeds. This is because the start of the wind speed dependence shifts rapidly to higher wind speeds at frequencies above 13 kHz. A physical explanation for this observation may be the low proportion of bubbles in brackish water that are small enough to radiate sound above 10 kHz. Such bubbles apparently do not begin to develop in brackish water until high wind speeds are attained.

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