Abstract
A method for remote determination of the mean grain size of sand sediments is demonstrated. The method uses the backscattered signal from a bounded acoustic beam incident onto a water–sediment interface. The possibility of grain size determination stems from a localized enhancement in the backscattering for acoustic wavelengths of the same order as grain size. A phenomenological model that recaptures the overall structure of the experimental data is developed. The sediment is pictured as having a network of channels running through it, and the model developed is novel in its inclusion of channel effects as well as rough surface effects in modeling the backscattered signal.
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