Abstract
Analytical solutions of acoustic wave scattering have been obtained for turbulent currents and for shallow water internal waves. The scattering characteristics of the two are quit different. The most striking difference is that the maximum scattering is in only one direction by turbulence. Whereas there are two directions of maximum scattering in internal waves. In turbulence, acoustic waves scatter quite strongly while internal waves acoustic waves scatter very weakly. Therefore, turbulence changes acoustic wave (coherent) energy rapidly into (incoherent) scattered acoustic energy. The scattering of acoustic energy by internal waves is weak, on the order of 0.001 of that of turbulence. The theoretical results are verified with transmission loss measured in Kanmon Strait and at New Jersey Shelf with good agreements. [Work supported by ONR Code 322 OA.]
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