Abstract
This paper investigates the effect of wave-induced streaming on sediment transport by applying a newly developed numerical sediment transport model. The transport model solves the intra-wave oscillatory motion and sediment concentrations. The wave-induced streaming in the wave boundary layer, as occurs in propagating waves, is an integral part of the computed flow field. Comparison of the computed flow field with wave-current flume experiments gives good results. The model can also describe the horizontally uniform situation in an oscillating water tunnel, in which vertical orbital velocities and wave-induced streaming are absent. The model is successfully tested against measurements of sediment concentrations and net transport rates performed in a large-scale oscillating water tunnel. The importance of streaming is assessed by comparing model results for the case with wave-induced streaming and the case of the oscillating water tunnel. For a typical water tunnel condition, the effect of the absence of vertical velocities and streaming is found to be a 40% lower net transport rate than the corresponding situation under propagating waves. These differences result not only from the net transport by the streaming velocity, but are also due to an increased asymmetry in the model of near-bed velocity, bed shear-stress and resulting sediment concentrations. This result suggests that the differences in transport rates between water tunnel and propagating waves may not be insignificant.
Original language | English |
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Pages (from-to) | 2453-2466 |
Number of pages | 14 |
Journal | Proceedings of Coastal Engineering Conference |
DOIs | |
Publication status | Published - 2001 |
Event | Coastal Engineering 2000 - 27th International Conference on Coastal Engineering, ICCE 2000 - Sydney, NSW, Australia Duration: 16 Jul 2000 → 21 Jul 2000 |