Observations of nearshore and surf zone wind stress

Shabani, Behnam, Nielsen, Peter and Baldock, Thomas (2014). Observations of nearshore and surf zone wind stress. In: Patrick Lynett, Proceedings of 34th Conference on Coastal Engineering. 34th International Conference on Coastal Engineering, Seoul, South Korea, (waves.50.1-waves.50.10). 15-20 June 2014. doi:10.9753/icce.v34.waves.50

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Author Shabani, Behnam
Nielsen, Peter
Baldock, Thomas
Title of paper Observations of nearshore and surf zone wind stress
Conference name 34th International Conference on Coastal Engineering
Conference location Seoul, South Korea
Conference dates 15-20 June 2014
Proceedings title Proceedings of 34th Conference on Coastal Engineering   Check publisher's open access policy
Journal name Coastal Engineering Proceedings   Check publisher's open access policy
Place of Publication Los Angeles, CA, United States
Publisher Coastal Engineering Research Council
Publication Year 2014
Sub-type Fully published paper
DOI 10.9753/icce.v34.waves.50
Open Access Status DOI
ISBN 9780989661126
ISSN 2156-1028
Editor Patrick Lynett
Volume 34
Start page waves.50.1
End page waves.50.10
Total pages 10
Abstract/Summary Field data of the wind stress over surf zone waves is presented from an open ocean beach on the East Australian Coast. Two ultrasonic anemometers were deployed at nominal heights of 5 and 10 m above the water surface in the intertidal and inner surf zones, with concurrent measurements of water levels and offshore wave param- eters. Considering near-neutral conditions only, the wind drag coefficients were found to systematically change with the wind angle of approach relative to the shoreline, and are much smaller for longshore wind than during onshore wind. The concept of an apparent wave steepness changing with wind direction is suggested to explain this behaviour. The drag coefficients over the surf zone during onshore wind and near-neutral conditions were determined to be almost twice the values expected at the same wind speed and open ocean conditions. The ob- served Charnock coefficient was similarly an order of magnitude larger than open ocean values. A wave celerity of the order of that expected in the inner surf zone is required to explain the observed large roughness and drag coefficients using existing wave-age dependent parameterisations. This suggests that the slower wave celerity in the surf zone is an important contributor to the increased wind stress, in addition to the sawtooth wave shape.
Keyword Air-sea interaction
Wind stress
Drag coefficient
Surf zone
Nearshore region
Field study
Storm surge
Q-Index Code EX
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes waves.50

Document type: Conference Paper
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Created: Tue, 06 Jan 2015, 22:14:41 EST by Dr Behnam Shabani on behalf of Faculty Of Engineering, Architecture & Info Tech