IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 34th Congress - Brisbane (2011) : THEME 2: Coastal Hydraulics: Form and Function : Physical modelling of waves induced sheet flows
Physical modelling of waves induced sheet flows
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Experiments on a beach were carried out in a wave flume. The beach is made of lightweight sediment to fulfil Shields and Rouse scaling in order to reproduce sediment destabilizing and erosion processes in a controlled environment. The repetition of identical wave sequences on an equilibrium beach profile allows reliable phase average measurements of velocity, bed and top sheet flow elevation, pressure and concentration near the bed. The relative importance of infiltration/exfiltration, acceleration, pressure gradients on the erosion is analysed. It appears that the sheet-flow is the thickest under the wave crests, indicating that the erosion is mainly driven by the cross-shore velocity outside the boundary layer. On the other hand we find a good correlation between the fluid accelerations and the time evolution of sheet-flow thickness. Finally, the exfiltration/infiltration is found to play a minor role in the sheet-flow dynamics.
File Size : 327,866 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 34th Congress - Brisbane (2011)
Article : THEME 2: Coastal Hydraulics: Form and Function
Date Published : 01/07/2011
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