Abstract
Measurements of underwater noise produced by rain over the open ocean were made at a site some 1 km off Ucluelet on the west coast of Vancouver Island, British Columbia, Canada. A hydrophone was placed near the bottom in 55 m of water in the path of the prevailing eastward moving Pacific storm systems. The spectral noise-level dependence on rain rate between zero and 20 mm/h was determined for various frequencies and sea states. A straight line, least-squares fit to the sample values of spectral level plotted against the log of rain rate was found to best represent the relationship. Representative rain noise spectra for various rain rates and sea states were derived.
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