Measurement and modelling of hydrodynamics at the surf-swash boundary

Power, H. E. and Baldock, T. E. (2011). Measurement and modelling of hydrodynamics at the surf-swash boundary. In: Eric. M. Valentine, Proceedings of the 34th IAHR World Congres; 33rd Hydrology and Water Resources Symposium; 10th Conference on Hydraulics in Water Engineering. 34th World Congress of the International Association for Hydro-Environment Engineering and Research (IAHR): 33rd Hydrology and Water Resources Symposium and 10th Conference on Hydraulics in Water Engineering, Brisbane, Australia, (1017-1023). 26 June - 1 July 2011.

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Name Description MIMEType Size Downloads
Author Power, H. E.
Baldock, T. E.
Title of paper Measurement and modelling of hydrodynamics at the surf-swash boundary
Conference name 34th World Congress of the International Association for Hydro-Environment Engineering and Research (IAHR): 33rd Hydrology and Water Resources Symposium and 10th Conference on Hydraulics in Water Engineering
Conference location Brisbane, Australia
Conference dates 26 June - 1 July 2011
Proceedings title Proceedings of the 34th IAHR World Congres; 33rd Hydrology and Water Resources Symposium; 10th Conference on Hydraulics in Water Engineering
Place of Publication Barton, ACT, Australia
Publisher Engineers Australia
Publication Year 2011
Sub-type Fully published paper
ISBN 9780858258686
Editor Eric. M. Valentine
Start page 1017
End page 1023
Total pages 7
Collection year 2012
Language eng
Abstract/Summary Swash zone boundary conditions are investigated using field observations of the inner surf zone and the swash zone for a range of micro-tidal, predominantly swell-dominated, sandy beaches. The boundary conditions are characterized in terms of a terminal bore height and the asymmetry between uprush and backwash flows. Terminal bore heights are calculated by examining wave evolution across the surf zone. This is investigated in terms of wave height to water depth ratios (γ) and waves are shown to be unsaturated. These observations are used to approximate the terminal bore height at the surf swash boundary as Hb≈0.12Ho, which is consistent with recent laboratory data sets. Wave transformation modelling is used to identify conditions where the surf zone is predicted to be unsaturated and this is found to occur for steep beaches and large wave periods. A normalised beach slope parameter is derived to separate these two regions. The asymmetry between uprush and backwash flows is investigated using remote sensing techniques. The time of flow reversal in the swash zone was found to occur at approximately 40-50% of the duration of the swash cycle, which is significantly different from previous theory.
Keyword Swash
Inner surf zones
Bores
Saturation
Flow asymmetry
Surf-swash boundary
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes "Balance and Uncertainty: Water in a Changing World", the main theme of the Congress focuses on the central roles of hydraulic engineering, hydrology and water resources in our changing world, and how these roles link to the broader issues

Document type: Conference Paper
Collections: School of Civil Engineering Publications
Official 2012 Collection
 
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Created: Mon, 30 Jan 2012, 11:18:03 EST by Jeannette Watson on behalf of School of Civil Engineering