Threshold studies of gravel size particles under the co-linear combined action of waves and currents

Panagiotopoulos, I., Sylaios, G. and Collins, M.B. (1994) Threshold studies of gravel size particles under the co-linear combined action of waves and currents. Sedimentology, 41 (5), 951-962. (doi:10.1111/j.1365-3091.1994.tb01434.x).

Record type: Article

Abstract

Gravel size sediment beds are tested under the combined influence of simulated wave action and co-linear currents in a laboratory flume. Critical current speed, at threshold, increases with increasing size. Superimposed wave energy causes a small reduction in the unidirectional current energy. For low values of wave-induced near bed current velocities, the resistance to erosion increases when the wave period decreases from 10 to 6 s. Finally, combined critical shear stresses are found to be lower than those predicted using the Shields curve, as modified for oscillatory flow. Grain protrusion is suggested as a mechanism to explain this divergence.

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