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Transport processes of uniform and mixed sands in oscillatory sheet flow

✍ Scribed by Wael N. Hassan; Jan S. Ribberink

Publisher: Elsevier Science
Year: 2005
Tongue: English
Weight: 542 KB
Volume: 52
Category: Article
ISSN: 0378-3839
DOI: 10.1016/j.coastaleng.2005.06.002

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✦ Synopsis

New experiments were carried out in the Large Oscillating Water Tunnel of WL|Delft Hydraulics (scale 1:1) using asymmetric 2nd-order Stokes waves. The main aim was to gain a better understanding of size-selective sediment transport processes under oscillatory plane-bed/sheet-flow conditions. The new data show that for uniform sand sizes between 0.2 b D b 1.0 mm, measured net transport rates are hardly affected by the grain size and are proportional to the third-order velocity moment. However for finer grains (D = 0.13 mm) net sand transport rates change from the donshoreT direction into the doffshoreT direction in the high velocity range. A new measuring technique for sediment concentrations, based on the measurement of electro-resistance (see [

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