Abstract
It is suggested that the jets or “bursts” of fluid hurled up from flat beds of sand or gravel in oscillatory flow may produce significant modification of the velocity profile. A two-layer model is put forward to investigate this possibility. The calculated velocity profiles are found to reproduce the main features of observed profiles. The experimental results of Kalkanis and Sleath are re-analysed in the light of this model and further measurements of the velocity distribution, designed to extend the experimental range, are reported. The new measurements were made in an oscillating tray rig with a laser doppler anemometer. Finally, the results obtained for the velocity distribution are used to calculate friction and dissipation factors. The calculations show satisfactory agreement with the measurements of Kamphuis.
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