Can we reliably estimate dune erosion without knowing pre-storm bathymetry?

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Title Can we reliably estimate dune erosion without knowing pre-storm bathymetry?
Author Splinter, Kristen; Strauss, Darrell; Tomlinson, Rodger Benson
Publication Title 20th Australasian Coastal and Ocean Engineering Conference
Editor Prof C Pattiaratchi
Year Published 2011
Place of publication Australia
Publisher Engineers Australia
Abstract Pre-storm bathymetry is a required boundary condition for processed-based dune erosion models but is often out of date, extremely coarse resolution, or in the worst case, non-existent. Despite these limitations, coastal engineers and managers are being called upon to provide estimates of dune erosion to vulnerable coastal communities in light of changes in storm conditions and longer term climate projections. Here we calibrate and then use a state of the art dune erosion model (XBeach) to predict a range of possible erosion volumes for the May 2009 East Coast Low that impacted the Gold Coast, Australia. Using pre-storm bathymetry surveys the model required minimal calibration. Predicted erosion volumes, as well as shoreline retreat were in good agreement with observations. To account for errors in nearshore bathymetry, the suite of available surveys was used to estimate a range of erosion volumes. The model results were relatively insensitive to the range of available bathymetry. Milder sloping and terraced/barred profiles resulted in less dune erosion, while steeper foreshores and non-barred profiles were more vulnerable.
Peer Reviewed Yes
Published Yes
Publisher URI
Copyright Statement Copyright remains with the authors 2011. The attached file is reproduced here in accordance with the copyright policy of the publisher. For information about this conference please refer to the conference’s website or contact the authors.
ISBN 9780858258860
Conference name Coasts and Ports 2011
Location Perth, Australia
Date From 2011-06-26
Date To 2011-07-01
Date Accessioned 2012-05-30
Language en_US
Research Centre Griffith Centre for Coastal Management
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Civil Engineering; Oceanography
Publication Type Conference Publications (Full Written Paper - Refereed)
Publication Type Code e1

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