Geomorphology and sediment transport on a submerged back-reef sand apron: One Tree Reef, Great Barrier Reef

Harris, Daniel L., Vila-Concejo, Ana and Webster, Jody M. (2014) Geomorphology and sediment transport on a submerged back-reef sand apron: One Tree Reef, Great Barrier Reef. Geomorphology, 222 132-142. doi:10.1016/j.geomorph.2014.03.015


Author Harris, Daniel L.
Vila-Concejo, Ana
Webster, Jody M.
Title Geomorphology and sediment transport on a submerged back-reef sand apron: One Tree Reef, Great Barrier Reef
Journal name Geomorphology   Check publisher's open access policy
ISSN 0169-555X
1872-695X
Publication date 2014-10-01
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.geomorph.2014.03.015
Open Access Status Not yet assessed
Volume 222
Start page 132
End page 142
Total pages 11
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Formatted abstract
Back-reef sand aprons are conspicuous and dynamic sedimentary features in coral reef systems. The development of these features influences the evolution and defines the maturity of coral reefs. However, the hydrodynamic processes that drive changes on sand aprons are poorly understood with only a few studies directly assessing sediment entrainment and transport. Current and wave conditions on a back-reef sand apron were measured during this study and a digital elevation model was developed through topographic and bathymetric surveying of the sand apron, reef flats and lagoon. The current and wave processes that may entrain and transport sediment were assessed using second order small amplitude (Stokes) wave theory and Shields equations. The morphodynamic interactions between current flow and geomorphology were also examined. The results showed that sediment transport occurs under modal hydrodynamic conditions with waves the main force entraining sediment rather than average currents. A morphodynamic relationship between current flow and geomorphology was also observed with current flow primarily towards the lagoon in shallow areas of the sand apron and deeper channel-like areas directing current off the sand apron towards the lagoon or the reef crest. These results show that the short-term mutual interaction of hydrodynamics and geomorphology in coral reefs can result in morphodynamic equilibrium.
Keyword Carbonate sand
Coral reef morphodynamics
Lagoonal infill
One tree reef
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Earth Sciences Publications
 
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Citation counts: TR Web of Science Citation Count  Cited 10 times in Thomson Reuters Web of Science Article | Citations
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