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Threshold studies of gravel size particles under the co‐linear combined action of waves and currents
Author(s) -
PANAGIOTOPOULOS I.,
SYLAIOS G.,
COLLINS M. B.
Publication year - 1994
Publication title -
sedimentology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.494
H-Index - 108
eISSN - 1365-3091
pISSN - 0037-0746
DOI - 10.1111/j.1365-3091.1994.tb01434.x
Subject(s) - flume , geology , grain size , current (fluid) , erosion , sediment , sediment transport , shear (geology) , wave flume , geotechnical engineering , mechanics , shields , flow (mathematics) , geomorphology , breaking wave , oceanography , petrology , physics , wave propagation , optics , shield
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.