Abstract
Scattering of sound from the sea surface and sea bottom causes losses in spatial coherence of the propagated sound field. Ocean measurements have been made of the wavefront coherence in both vertical and horizontal directions at frequencies of 2.4, 4.7, and 9.4 kHz in moderate sea-state conditions. Omnidirectional source and receivers were used, and results are presented for two geometries: (1) deep water in which only a single surface reflection is encountered and (2) shallow water where multiple surface and bottom reflections exist. Variations in coherence with source and receiver depths are described, and results are compared with theoretical estimates of the angular dispersion produced by scattering at the rough boundaries.
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