Abstract
The underwater acoustic noise spectrum during rainfall has been measured in a coastal ocean environment for a wide range of sea states and rainfall intensities. The relationship between spectral noise level and rain rate was examined and a power law function fitted to data at 5, 8, 15, 20, and 30 kHz. Finally, a family of curves representing the acoustic noise spectrum for sea states 12, 1, 2, 3, 4, and 5 and rain conditions of 1.0, 3.0, 5.0, and 7.0 mm/h was derived. Results indicate a domination of the acoustic noise spectra by rain‐generating mechanisms at frequencies in the band 7–25 kHz and sea states less than 4. Furthermore, the smearing of the rain‐generated spectral peak near 15 kHz strongly supports the postulation of a strong dependence of rain‐generated acoustic noise on sea surface conditions. [Work supported by DSS Unsolicited Proposals Program, IOS, and DND.]
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