Abstract

Recently both Mackenzie [J. Acoust. Soc. Am. 34, 66 (1962)] and Urick [J. Acoust. Soc. Am. 34, 1721 (1962)] have reported experiments measuring reverberation over deep, flat ocean floors. Both give data that may be empirically described by Lambert's law, at least over certain ranges of time. These results seem somewhat surprising since Lambert's law scattering is usually associated with very rough surfaces (compared to wavelength), quite unlike the deep ocean floors. In an effort to find a mechanism for reverberation, calculations have been made for a source located above a plane boundary separating two fluids. No roughness on the boundary was assumed. A reverberation “tail” was found to follow the specularly reflected signal. Computations show, however, that this “tail” is many orders of magnitude too small to account for the results of Mackenzie and Urick. Reasons for this discrepancy are considered. The possible interpretation of reverberation measurements for oceanographic data taking is discussed.

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