Sheet flow
Definition of Sheet flow:
Sheetflow sediment transport refers to transport of sandy sediments as a fluidized thin surface layer (thickness of ten to a few tens of grains).
This is the common definition for Sheet flow, other definitions can be discussed in the article

Notes
Sheet flow is a particular form of bedload sediment transport in which the seabed is flattened and the top soil layer is fluidized. Sheet flow transport occurs when the seabed is subjected to high shear stresses, especially shear stresses generated by strong wave action (wave orbital velocity greater than 1 m/s). In the sheetflow layer, continuous contacts between sand grains create an intergranular stress. This stress decreases the velocity in the sheetflow layer to about one half the velocity in the top layer. The sediment concentration in the sheetflow layer is in the order of 100 to 1000 kg/m^{3}.
The formation of a sheet flow layer is promoted by cyclic wave loading of the seabed, see Waveinduced soil liquefaction.
Flume experiments^{[1]} suggest that the maximum wavegenerated sheetflow layer thickness [math]\delta_{s, max}[/math] depends linearly on the maximum bed shear stress [math]\tau_{b,max}[/math],
[math]\delta_{s, max} = \Lambda \Large\frac{\tau_{b, max}}{g \Delta \rho} , [/math]
where [math]\Delta \rho[/math] is the density difference between sediment and seawater, [math]g[/math] the gravitational acceleration and [math]\Lambda[/math] a coefficient with values in the range 1035.
Related articles
References
 ↑ Mieras, R.S., Puleo, J.A., Anderson, D., Cox, D.T. and Hsu, T.J. 2017. Largescale experimental observations of sheet flow on a sandbar under skewedasymmetric waves, J. Geophys. Res. Oceans 122: 5022–5045
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