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The project was primarily concerned with the “sheet-flow” regime of sand transport. This occurs at the sea bed under the action of very large storm waves, which produce a slurry of water-sand mixture at the sea bed which is swept back and forth by the wave velocities, and carried by tidal, wave- or wind-driven currents that carry the slurry of sand with them, or by asymmetries in the wave motion that result in a net drift of sand.