Abstract
One source of clutter for active sonar in shallow water is backscatter from the rough ocean bottom. Backscatter may often be dominated by Bragg scale roughness. Bathymetry measurements are not generally made at sufficient resolution to determine the Bragg scale roughness distribution directly. We examine the distribution of ocean bottom slopes and determine power law relationships. These relationships can be used to define fractals which allow extrapolations of bathymetry to finer scale. The fine-scale bathymetry is then related to the distributions of sonar clutter. The generalized gamma distribution is particularly useful to describe clutter. The upper tail of this distribution approaches a power law related to the power laws in the bathymetry. [This work is sponsored by the Office of Naval Research (ONR).]
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