Storm surge estimates using wind stress coefficients determined from wind-wave growth observations

Callaghan David P., Stewart, Jared, Nielsen, Peter and Baldock, Tom E. (2011). Storm surge estimates using wind stress coefficients determined from wind-wave growth observations. In: Coasts and Ports 2011 Conference papers. 20th Australasian Coastal and Ocean Engineering Conference and the 13th Australasian Port and Harbour Conference, Perth, Australia, (173-178). 28-30 September 2011.

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Name Description MIMEType Size Downloads
Author Callaghan David P.
Stewart, Jared
Nielsen, Peter
Baldock, Tom E.
Title of paper Storm surge estimates using wind stress coefficients determined from wind-wave growth observations
Conference name 20th Australasian Coastal and Ocean Engineering Conference and the 13th Australasian Port and Harbour Conference
Conference location Perth, Australia
Conference dates 28-30 September 2011
Proceedings title Coasts and Ports 2011 Conference papers
Journal name 20th Australasian Coastal and Ocean Engineering Conference 2011 and the 13th Australasian Port and Harbour Conference 2011, COASTS and PORTS 2011
Place of Publication Nedlands, W.A., Australia
Publisher The University of Western Australia
Publication Year 2011
Sub-type Fully published paper
ISBN 9781622764303
Start page 173
End page 178
Total pages 6
Collection year 2012
Language eng
Abstract/Summary The numerical predictions of historical storm surges in which the low pressure meteorological system remains well offshore requires a factor three or more wind stress than that provided using the standard wind stress coefficients found in the literature. The literature values are from ‘air side’ where wind stress coefficients are determined either from measured vertical velocity gradient of the wind over the water or more commonly from wind Reynolds stresses). On the other hand, the wind stress required to match the observed storm surges are consistent with the momentum transfer observed during wind-wave growth experiments (i.e., the inferred wind stress coefficients from experiments measuring wave height growth due to wind). Both the wind-wave growth data and our storm surge modelling are consistent with field and laboratory measurements of Reynolds stresses of wind-driven waves. The possibility that there is more momentum being transferred downwards urges the development of a storm surge model capable of using the wind stress inferred from the wind-wave growth data. This requires a Reynolds stress model covering deep through to shallow water depths and at arbitrary levels (3D model implementation), which has been formulated herein. Application of this wind stress to Tropical Cyclone Roger using the steady shallow water equations qualitatively explains the observed storm surge. This new approach also raises the question of why storm surge estimates are generally acceptable for weather systems that cross the coastline despite the use of momentum transfer based on air side wind stress.
Keyword Wind waves
Reynolds stress
Wind stress
Storm surge
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Conference Paper
Collections: School of Civil Engineering Publications
Official 2012 Collection
 
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Created: Tue, 20 Mar 2012, 15:46:27 EST by Julie Hunter on behalf of School of Civil Engineering