Abstract
The sound generated by rainfall at sea is caused by raindrops of a wide size range that fall at their terminal velocities and generally strike the ocean surface at local, oblique incidence. Laboratory experiments have been conducted to evaluate the energy spectrum of sounds caused by both the impact and the bubble formed by single raindrops. The results, using terminal velocities and oblique trajectories, are very different from the published normal incidence, nonterminal‐velocity characterizations. For example, bubble frequencies other than the well‐known 14‐kHz peak are found. Also, the energy of the impact sound increases significantly for larger drops and for large deviations from normal trajectories. These observations provide specific reasons for the known broadening of the 14‐kHz spectral peak of rain noise in the presence of winds at sea. [Work supported by ONR.]
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