Discriminating Modes of Shoreline Response to Offshore-Detached Structures
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 132, Issue 3
Abstract
Offshore-detached structures are used to limit shoreline erosion, and to provide a safe haven for marine craft or bathers. Their function is to reduce the amount of wave energy in their lee, and to enhance sediment deposition at the shoreline. Planform shoreline changes in the vicinity of an offshore structure represent the integrated effect of natural shoreline variability, and engineering factors including sand nourishment, the formation of a shoreline salient, and a secondary “groyne effect” induced by a gradient in the alongshore transport. To quantitatively assess a structure’s performance, it is necessary to first distinguish the structure-induced effects from the pre-existing shoreline variability, and second to discriminate and quantify these differing modes of shoreline response. The easily applied technique “odd–even function analysis” can be used to discriminate the principal modes of shoreline behavior in the vicinity of offshore-detached structures, and to distinguish this induced response from naturally occurring shoreline variability. The successful application of the technique is illustrated to identify early trends in coastline adjustment in the lee of a new submerged reef structure at the Gold Coast, Australia.
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Acknowledgments
Ongoing funding for the northern Gold Coast coastal imaging system used to obtain weekly shorelines is provided by Gold Coast City Council. The ARGUS video technique was developed with funds generated by Professor Rob Holman of the Coastal Imaging Laboratory, Oregon State University. The writer wishes to acknowledge Professor Holman for actively and generously stimulating the collaboration that has resulted in the growth of the worldwide ARGUS research group. The contributions of two anonymous reviewers significantly improved the analysis and manuscript. Finally, thanks to Dr. Ir. Stefan Aarninkhof and colleagues at WL∣Delft Hydraulics (The Netherlands), where the first draft of this manuscript was written during an extended visit by the writer.
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Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 132 • Issue 3 • May 2006
Pages: 180 - 191
Copyright
© 2006 ASCE.
History
Received: Jul 1, 2003
Accepted: May 17, 2005
Published online: May 1, 2006
Published in print: May 2006
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