Abstract
Variability is an important feature of high frequency acoustic bottom backscatter. A relationship had been developed between grain-size and backscattering strength in the laboratory, but it rarely applies in the field. The main problem is that real ocean sediments have surface roughness and volume scatterers or inclusions that are continually evolving. The result is a rather large range of variations as a function of space and time. In some cases, estimates of the variability may be obtained from the extant database of published measurements. [Work supported by the Office of Naval Research, Ocean Acoustics.]
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