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Rip Characterisation on the Gold Coast, Australia: An Analysis using Coastal Imaging Techniques

Coasts and Ports 2005 : Coastal Living - Living Coast; Australasian Conference; Proceedings

Abstract: Rip currents play an important role in nearshore circulation, sediment transport, bar and shoreline change and have implications for beach safety. Three years of daily time exposure images obtained by an automated ARGUS coastal imaging station have been analysed in this study to examine the effect(s) of prevailing wave conditions on rip characteristics at the northern Gold Coast, Queensland, Australia. The study area is a long, straight beach on an open coast in a swell-dominated environment. Rip currents are identified in rectified daily time exposure images by differences in pixel intensities. The primary purpose of this paper is to analyse rip characteristics such as rip location, rip spacing and the spatial and temporal persistence of rip currents. A secondary objective is to compare these results with a similar study performed at the embayed Palm Beach in New South Wales, Australia. Analysis of the frequency of occurrence of rip locations indicates that there is no preference for rips to form in any particular location. It was also found that there is no significant correlation between the mean rip spacing and offshore wave height, suggesting that the underlying shoals and channels may topographically control rip currents once they are formed. Further, rip currents were observed to migrate under obliquely incident waves.

To cite this article: Whyte, David; Turner, Ian L and Ranasinghe, Roshanka. Rip Characterisation on the Gold Coast, Australia: An Analysis using Coastal Imaging Techniques [online]. In: Townsend, Murray Robert (Editor); Walker, David (Editor). Coasts and Ports 2005 : Coastal Living - Living Coast; Australasian Conference; Proceedings. Barton, A.C.T.: Institution of Engineers, Australia, 2005: 233-238. Availability: <http://search.informit.com.au/documentSummary;dn=492673800251231;res=IELENG> ISBN: 0646451308. [cited 27 Jun 17].

Personal Author: Whyte, David; Turner, Ian L; Ranasinghe, Roshanka; Source: In: Townsend, Murray Robert (Editor); Walker, David (Editor). Coasts and Ports 2005 : Coastal Living - Living Coast; Australasian Conference; Proceedings. Barton, A.C.T.: Institution of Engineers, Australia, 2005: 233-238. DOI: Document Type: Conference Paper, Research ISBN: 0646451308 Subject: Sediment transport; Tidal currents--Mathematical models; Coasts; Hydrodynamics--Environmental aspects; Identifier: Rip currents Affiliation: (1) Manly Hydraulics Laboratory, New South Wales Department of Commerce
(2) Water Research Laboratory, School of Civil and Environmental Engineering, University of New South Wales
(3) New South Wales Department of Infrastructure, Planning and Natural Resources

Database: Engineering Collection