Influence of hydrodynamic energy on Holocene reef flat accretion, Great Barrier Reef

Dechnik, Belinda, Webster, Jody M., Nothdurft, Luke, Webb, Gregory E., Zhao, Jian-xin, Duce, Stephanie, Braga, Juan C., Harris, Daniel L., Vila-Concejo, Ana, and Puotinen, Marji (2016) Influence of hydrodynamic energy on Holocene reef flat accretion, Great Barrier Reef. Quaternary Research, 85. pp. 44-53.

[img] PDF (Published Version) - Published Version
Restricted to Repository staff only

View at Publisher Website:


The response of platform reefs to sea-level stabilization over the past 6 ka iswell established for the Great Barrier Reef (GBR), with reefs typically accreting laterally from windward to leeward. However, these observations are based on few cores spread across reef zones and may not accurately reflect a reef's true accretional response to the Holocene stillstand. We present a new record of reef accretion based on 49 U/Th ages from Heron and One Tree reefs in conjunctionwith re-analyzed data from14 reefs across the GBR.We demonstrate that hydrodynamic energy is the main driver of accretional direction; exposed reefs accreted primarily lagoon-ward while protected reefs accreted seawards, contrary to the traditional growth model in the GBR. Lateral accretion rates varied from 86.3 m/ka–42.4 m/ka on the exposed One Tree windward reef and 68.35 m/ka–15.7 m/ka on the protected leeward Heron reef, suggesting that wind/wave energy is not a dominant control on lateral accretion rates. This represents the most comprehensive statement of lateral accretion direction and rates from the midouter platform reefs of the GBR, confirming great variability in reef flat growth both within and between reef margins over the last 6 ka, and highlighting the need for closely-spaced transects.

Item ID: 47335
Item Type: Article (Research - C1)
ISSN: 1096-0287
Keywords: reef growth, still-stand, sea-level, accretion, Holocene, Great Barrier Reef
Funders: Australian Research Council (ARC)
Projects and Grants: ARC DP1094001, ARC DP1096184, ARC DP120101793, ARC FT100100215
Date Deposited: 31 Mar 2017 01:57
FoR Codes: 37 EARTH SCIENCES > 3705 Geology > 370504 Marine geoscience @ 60%
37 EARTH SCIENCES > 3705 Geology > 370506 Palaeontology (incl. palynology) @ 30%
41 ENVIRONMENTAL SCIENCES > 4104 Environmental management > 410499 Environmental management not elsewhere classified @ 10%
SEO Codes: 96 ENVIRONMENT > 9603 Climate and Climate Change > 960307 Effects of Climate Change and Variability on Australia (excl. Social Impacts) @ 60%
97 EXPANDING KNOWLEDGE > 970104 Expanding Knowledge in the Earth Sciences @ 40%
Downloads: Total: 2
More Statistics

Actions (Repository Staff Only)

Item Control Page Item Control Page