In this study, a diffusion-averaged Volume of Fluid–Discrete Element Method model was developed to investigate sheet flow sediment transport under surface waves and dambreak-induced swash. The model was validated against large wave flume experiments of non-breaking monochromatic wave-induced sheet flow. The model successfully predicted the sediment concentration profiles, as well as the net-onshore dominated sediment transport rate under velocity-skewed waves. Visualization of vortical structures revealed the existence of bed-penetrating Kelvin–Helmholtz rollers within the upper section of the sheet flow layer thickness. The onset of momentary bed failure in this study was recorded at periods when the Sleath parameter, S 0.53. For dambreak-induced swash, the under-prediction of the maximum shoreline limit, as well as the swash depth and velocity at the shoreward limit, is attributed to enhanced infiltration in the gravel bed from random-closed packing. Simulated intra-swash sediment flux compared well with the measured data, with discrepancies primarily due to the smoothing length and the location of the initial shoreline.
Agyei et al. (Thu,) studied this question.
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