Abstract
The facet-ensemble method [W. A. Kinney et al., J. Acoust. Soc. Am. 73, 183–194 (1983)] is used to determine if the spatial wavenumber power spectrum of a rough surface is sufficient to predict the amplitude and spatial coherence of acoustic energy scattered from that surface. Two sets of water surfaces are studied. Within each set, the surfaces have the same rms roughness (0.2 cm) and spatial power spectrum. For each surface, the acoustic field in the water is computed at two omnidirectional receivers for both backscatter and forward scatter at a grazing angle of 35°. The source emits a 100-kHz signal and has a beamwidth of 13°. The total travel distance is 506 cm. Results indicate that the backscattered energy is more sensitive to detailed surface shape than is the forward scattered energy. This implies that the surface spatial power spectrum may not be sufficient to predict backscatter accurately.
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