Abstract
Statistical properties of ocean bottom roughness for use in models of acoustic scattering from the ocean bottom were investigated for a wide variety of bottom types. The roughness probability density functions and spectra were determined from submarine topographic data obtained by narrow-beamwidth multibeam echosounding and sea bottom photogrammetry. The resultant power spectra of the roughness were compared to the asymptotic expression, A(k)=ck−b, where A(k) is the power spectral density, c is a constant, k is the wavenumber, and n is a constant which is characteristic of the class of roughness. In analytical treatments of acoustic scattering from a randomly rough ocean bottom, the bottom roughness power spectra is often assumed to have a dependence of b=3. However, for these data the value of b ranges from about 0 to about 4. The geological and oceanographic processes that may cause the wide variety of roughness spectra and probability density functions are discussed.
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