Poikonen A. Analysis of high-frequency wind-driven ambient noise in shallow brackish water.
THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2011;
129:EL128-EL134. [PMID:
21476619 DOI:
10.1121/1.3555767]
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Abstract
Ambient noise spectra in a shallow brackish water environment were found to be steeper than expected at frequencies above 10 kHz. The high-frequency behavior of the spectra was resolved by modeling dispersion and noise in bubbly water. Bubble size distributions fitted to the brackish water spectra exhibit a distinctive maximum in the radius range 0.1-0.3 mm, and a substantial drop in bubble density below a radius of 0.1 mm. The brackish water distributions were tied to an oceanic spectrum with a spectral slope of 5.7 dB/octave obtained with a -3 / 2 power law dependence of bubble size density on radius.
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