Abstract
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 language | English |
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Title of host publication | Coastal Engineering 2008 |
Subtitle of host publication | Proceedings of the 31st International Conference |
Editors | Jane McKee Smith |
Publisher | World Scientific |
Pages | 1583-1595 |
ISBN (Electronic) | 978-981-4467-56-8 |
ISBN (Print) | 978-981-4277-36-5 |
DOIs | |
Publication status | Published - May 2009 |
Event | 31st International Conference on Coastal Engineering 2008 - Hamburg, Germany Duration: 31 Aug 2008 → 5 Sept 2008 |
Conference
Conference | 31st International Conference on Coastal Engineering 2008 |
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Country/Territory | Germany |
City | Hamburg |
Period | 31/08/08 → 5/09/08 |