Analysis of acoustic ambient noise in Monterey Bay, California.
Elles, Christopher Jacob.
Wilson, O.B. Jr.
Ball, Harvey A.
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Magnetic tape recordings, made in 1980 and 1981 by previous investigators using sonobuoys, of acoustic ambient noise in the south-eastern parts of Monterey Bay for various stations under various surf conditions, were analyzed. A computer program was developed and used with sonobuoy calibration data to correct :raw-data" to absolute sound pressure levels. The variation of omnidirectional levels with range from the beach as a function of surf condition was investigated over a frequency range of 10-2500 Hz. Discussions of methods used during data-taking and analysis, the computer program itself, and typical data for certain surf conditions are reported. Some tentative conclusions are drawn from the results and presented. Comparison of one-third octave band levels indicate that the highest low-frequency levels exist for "heavy " surf conditions, especially for the band at 500 Hz, with levels decreasing in strength with increasing range from shore. These results are consistent with conclusions reached by the earlier investigators that significant contributions to ambient noise are made by sources in the surf zone.
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