Abstract
Existing models for wave-related (cross-shore) sand transport are primarily based on data from oscillatory flow tunnel experiments. However, theory and former experiments indicate that flow differences between full scale surface waves and oscillatory flow tunnels may have a substantial effect on the net sand transport. In this paper, high resolution measurements of boundary layer flow characteristics, sheet-flow layer sediment concentrations and net sand transport rates under full scale surface waves are presented. These experiments were performed in a large wave flume (GWK) for different wave conditions with medium (D50 = 0.25 mm) and fine (D50 = 0.14 mm) sand. It is shown that, especially under sheet-flow conditions, small wave induced net currents are of large importance for the total sand transport rates under these conditions.
Highlights
Sand transport under non-breaking waves is for a large part determined by small scale near-bed processes
These measurements were done inside the wave boundary layer, and showed how the flow velocity decreases from the top of the wave boundary layer down to the bed
The mean velocity profile of the surface wave experiments show a consistent behaviour for all wave conditions for both fine and medium sand
Summary
Sand transport under non-breaking waves is for a large part determined by small scale near-bed processes. Sand concentrations, flow velocities and sediment transport rates are measured inside the sheet flow layer and wave boundary layer under full scale surface waves.
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