Abstract
The vertical profile of the concentration and size distribution of sediment particles near the ocean bottom at the HEBBLE site is correlated to the velocity field. These two parameters of the sediment distribution can be inferred from an acoustic backscattering experiment using transducers in the megaHertz frequency range. In this paper, the acoustic backscattering cross-section and reflectivity of spherical and spheroidal particles is calculated numerically at 5 MHz and 500 kHz using the size distribution and number density provided elsewhere in this volume. The concentration, even during a storm event, although expected to be two orders of magnitude greater than in the quiescent state, is low enough to permit a single scattering approximation.
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