Measurements of sheet flow transport in acceleration-skewed oscillatory flow and comparison with practical formulations

Dominic A. Van Der A (Corresponding Author), Thomas O'Donoghue, Jan S. Ribberink

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

Near-bed oscillatory flows with acceleration skewness are characteristic of steep and breaking waves in shallow water. In order to isolate the effects of acceleration skewness on sheet flow sand transport, new experiments are carried out in the Aberdeen Oscillatory Flow Tunnel. The experiments have produced a
dataset of net transport rates for full-scale oscillatory flows with varying degrees of acceleration skewness and three sand sizes. The new data confirm previous research that net transport in acceleration-skewed flow is non-zero, is always in the direction of the largest acceleration and increases with increasing acceleration
skewness. Large transport rates for the fine sand conditions suggest that phase lag effects play an important role in augmenting positive net transport. A comparison of the new experimental data with a number of practical sand transport formulations that incorporate acceleration skewness shows that none of the formulations performs well in predicting the measured net transport rates for both the fine and the coarser sands. The new experimental data can be used to further develop practical sand transport formulations to better account for acceleration skewness.
Original languageEnglish
Pages (from-to)331-342
Number of pages12
JournalCoastal Engineering
Volume57
Issue number3
DOIs
Publication statusPublished - Mar 2010

Keywords

  • sediment transport
  • sheet flow
  • oscillatory flow
  • sawtooth waves
  • acceleration skewness
  • transport formulation

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