Sediment transport in non-linear skewed oscillatory flows

the TRANSKEW experiments

Paulo Silva, Tiago Abreu, Dominic Alexander Van Der A, Francisco Sancho, B.G. Ruessink, Jebbe J. van der Werf, Jan S. Ribberink

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

New experiments under sheet flow conditions were recently carried out in an oscillating water tunnel to study the effects of flow acceleration on sand transport. The simulated hydrodynamic conditions considered flow patterns that drive cross-shore sediment transport in the nearshore zone: the wave nonlinearities associated with velocity and acceleration skewness and a negative mean current, the undertow. Net transport rates were evaluated from the sediment balance equation and show that (i) the acceleration skewness in an oscillatory flow produces a net sediment transport in the direction of the highest acceleration (onshore); (ii) the net transport in the presence of an opposing current is negative, against the direction of the highest acceleration, and reduces with an
increase in flow acceleration; and, (iii) velocity skewness increases the values of the net onshore transport rates. The measured transport rates have been used to evaluate the performance of different sediment transport models (four practical models and one 1DV process-based model) that take into account the wave nonlinearities. All models reproduce well the trends observed in the data; in the case of the combined wave-current flow the practical models are less accurate than the 1DV model.
Original languageEnglish
Pages (from-to)72-80
Number of pages19
JournalJournal of Hydraulic Research
Volume49
Issue numberS1
DOIs
Publication statusPublished - 2011

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oscillating flow
Sediment transport
sediment transport
skewness
experiment
Experiments
nonlinearity
undertow
sheet flow
flow pattern
Flow patterns
Tunnels
Sediments
Sand
tunnel
Hydrodynamics
hydrodynamics
sand
sediment
rate

Cite this

Silva, P., Abreu, T., Van Der A, D. A., Sancho, F., Ruessink, B. G., van der Werf, J. J., & Ribberink, J. S. (2011). Sediment transport in non-linear skewed oscillatory flows: the TRANSKEW experiments. Journal of Hydraulic Research, 49(S1), 72-80. https://doi.org/10.1080/00221686.2011.592681

Sediment transport in non-linear skewed oscillatory flows : the TRANSKEW experiments. / Silva, Paulo; Abreu, Tiago; Van Der A, Dominic Alexander; Sancho, Francisco; Ruessink, B.G.; van der Werf, Jebbe J.; Ribberink, Jan S.

In: Journal of Hydraulic Research, Vol. 49, No. S1, 2011, p. 72-80.

Research output: Contribution to journalArticle

Silva, P, Abreu, T, Van Der A, DA, Sancho, F, Ruessink, BG, van der Werf, JJ & Ribberink, JS 2011, 'Sediment transport in non-linear skewed oscillatory flows: the TRANSKEW experiments', Journal of Hydraulic Research, vol. 49, no. S1, pp. 72-80. https://doi.org/10.1080/00221686.2011.592681
Silva, Paulo ; Abreu, Tiago ; Van Der A, Dominic Alexander ; Sancho, Francisco ; Ruessink, B.G. ; van der Werf, Jebbe J. ; Ribberink, Jan S. / Sediment transport in non-linear skewed oscillatory flows : the TRANSKEW experiments. In: Journal of Hydraulic Research. 2011 ; Vol. 49, No. S1. pp. 72-80.
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