Abstract
Measurements have been made of sound scattered by submerged surfaces with Gaussian height and slope statistics. A wide range of roughness was spanned through the use of transient pulse analysis. In terms of the ratio of the rms surface height (σ) to sound wavelength (λ), the range included 0.03 < (σ/λ) < 5.0. Coherent and incoherent terms were separated digitally. In the region of small roughness, the coherent reflection coefficient was compared with two theoretical models. Comparisons with theory were also made using the incoherent term when large values of roughness were involved. At both extremes of the range, the experimental data agreed well with the theoretical predictions. Of particular interest in this experiment is the intermediate region in which the coherent and incoherent terms are explained in detail. Here the coherent term decreases rapidly and the incoherent term begins to dominate the scattering return. No adequate theoretical model exists for this transition region. [Work supported by ONR, Code 461, and NOSC, San Diego.]
Published Version
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