HYDROACOUSTICS
ANNUAL JOURNAL
START NEW VOL 20 SEARCH STATISTICS PAS - GDANSK DIVISION

The surface film effect on underwater noise of rain

pp. 181-184, vol. 1, 1997

Stanislaw J. Pogorzelski
Institute of Experimental Physics, University of Gdańsk, Gdańsk, Poland

Key words:

Abstract: The spectrum of rain noise shows a peak at 13.5 - 15kHz, stronger winds smear the peak. The spectral level (SL) at 15 kHz shows a linear dependence on the log of the rain rate with wind speed as a parameter. The presence of a monomolecular film on the sea surface results in a pronounced reduction of SL beneath the film by 10 log K. The damping ratio K is related to the viscoelastic properties, surface activity, concentration and diffusional coefficient of the surface-active substances composing the film.

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© Polish Acoustical Society - Gdansk Department, Polish Academy of Sciences. This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported. (CC BY-NC-SA 3.0)