Abstract
Our purpose has been to learn about sound scatter from the ocean bottom by using laboratory models. Previously we have reported measurements of the amplitude of the grazing coherent sound scatter from slightly rough surfaces; we have verified that the cylindrically diverging scattered (boundary) wave amplitude can surpass the spherically diverging direct wave amplitude from a point source. This is true for both deterministically and randomly rough surfaces. Now we compare the dispersive propagation velocity v of these waves over surfaces constructed of rigid spherical and hemispherical bosses, and of rigid corrugations of half‐cylinders and wedges, with the free field speed c over the smooth surface. From Tolstoy [J. Acoust. Soc. Am. 72, 960–972 (1979)] one expects the dispersion to be (c − v)/c = 12e2k2 with maximum value 0.1% at kh = 1 for close‐packed rigid hemispherical bosses. There are similar expressions for other roughness elements, where e is the scattering parameter which depends on the shapes, ...
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