Abstract
In earlier work the concepts of unidirectional sheet flow were extended to sinusoidal oscillatory motion. The analysis is now generalised to deal with asymmetric and irregular waves, obtaining relationships for friction factor and for the transition from bedforms to sheet flow. Comparison is made with experimental results obtained at Queen's University, Canada, and with data from Delft Hydraulics in the Netherlands. Asymmetric waves also produce net bed-load transport, which is analysed here and compared with the Delft Hydraulics data. It is found that the net bed-load transport rate is proportional to 〈 U 3〉, the third moment of near-bed free-stream velocity.
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