Effects of acceleration skewness on rough bed oscillatory boundary layer flow

Dominic Alexander Van Der A, Thomas O'Donoghue, Alan G. Davies, Jan S. Ribberink

Research output: Chapter in Book/Report/Conference proceedingPublished conference contribution

4 Citations (Scopus)


Acceleration skewness is a feature of the near-bed flow beneath steep and breaking waves. Recent interest in the effects of acceleration skewness on net sediment transport has highlighted a lack of detailed process measurements with which to inform the development of models. This motivated a series of experiments involving sawtooth-type oscillatory flows over fixed rough beds, conducted in a large-scale oscillatory flow tunnel. Detailed velocity measurements were made using Particle Image Velocimetry (PIV). The experimental results show a clear influence of flow acceleration on the nearbed velocity profile and on the shear stress. The greater the acceleration skewness, the higher the ratio of maximum positive (onshore) to maximum negative (offshore) bed shear stress. Predictions based on a 1DV k-e turbulence-closure model show general good agreement with the measured velocity profiles, near-bed residual current magnitude and the ratios of peak positive to peak negative shear stress.
Original languageEnglish
Title of host publicationCoastal Engineering 2008
Subtitle of host publicationProceedings of the 31st International Conference
EditorsJane McKee Smith
PublisherWorld Scientific
ISBN (Electronic)978-981-4467-56-8
ISBN (Print)978-981-4277-36-5
Publication statusPublished - May 2009
Event31st International Conference on Coastal Engineering 2008 - Hamburg, Germany
Duration: 31 Aug 20085 Sept 2008


Conference31st International Conference on Coastal Engineering 2008


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