Coral reef sediment dynamics: evidence of sand-apron evolution on a daily and decadal scale

Vila-Concejo, Ana, Harris, Daniel L., Shannon, Amelia M., Webster, Jody M. and Power, Hannah E. (2013) Coral reef sediment dynamics: evidence of sand-apron evolution on a daily and decadal scale. Journal of Coastal Research, 606-611. doi:10.2112/SI65-103.1

Author Vila-Concejo, Ana
Harris, Daniel L.
Shannon, Amelia M.
Webster, Jody M.
Power, Hannah E.
Title Coral reef sediment dynamics: evidence of sand-apron evolution on a daily and decadal scale
Journal name Journal of Coastal Research   Check publisher's open access policy
ISSN 0749-0208
Publication date 2013-01-01
Year available 2013
Sub-type Article (original research)
DOI 10.2112/SI65-103.1
Open Access Status Not yet assessed
Start page 606
End page 611
Total pages 6
Place of publication Coconut Creek, United States
Publisher Coastal Education & Research Foundation
Language eng
Formatted abstract
This paper investigates sand apron progradation on decadal and daily scales on a platform reef (One Tree Reef, OTR) located in the southern Great Barrier Reef. The decadal scale is addressed by analysing sand apron progradation using remotely sensed images (aerial photos and satellite imagery) coupled with wind data and cyclone events. The daily scale is addressed through a field campaign that was undertaken in September-October 2011. The campaign consisted of hydrodynamic measurements in three stations over the southern sand apron in OTR. It was found that while there was a small overall progradation over the last 31 years, the progradation had not occurred continuously or consistently along the entire sand apron. Additionally, the effect of cyclones was not clear on the decadal scale. On the daily scale, it was found that currents are generally weak (<0.4 m/s) and that currents during conditions at which suspended sediment is maximized are ocean-ward directed on the central part of the sand apron and lagoon-ward directed on the easternmost end. As such, daily sediment transport does not represent a gross contribution to lagoon infilling by sand apron progradation. Our results show that sand apron progradation does not occur continuously on the decadal or the daily scale.
Keyword Sand apron progradation
Sand sheet
Coral sand
Tropical geomorphology
Coral reef morphodynamics
Great Barrier 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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