Brief description
Wistari Reef is a lagoonal platform reef, situated on the Tropic of Capricorn, within the Capricorn and Bunker region of the southern Great Barrier Reef. Five surface samples were taken from the reef-flats and analysed to determine mean grainsize and the sorting coefficient (expressed as the standard deviation of grainsize). Results indicate that the reef flat area has an average mean grainsize is ~0.19phi, with an average sorting coefficient of 0.58phi.Lineage
Statement: Surface samples were collected on reef walks or on boat transects across Wistari Reef. Deeper samples were obtained by diving. Samples were collected using a hand-held scoop and 600ml plastic bottles. Sediment samples were sieved in order to determine modal particle diameters, and sorting data. Samples were first dry sieved. Sieves of sizes -1.0phi to 2.5phi were stacked and installed on a sieving shaker. Samples were weighed out to approximately 250g, and each sample was sieved for 15 mins to ensure correct separation of size fractions. Each fraction was then removed from the sieve and weighed. The size fractions 2.5phi, 3.0phi, 3.5phi and 4.0phi were pre-weighed, and wet sieved separately using a low pressure water hose, through smaller micropalaeontological sieves. Sediment textures are expressed in terms of mean grainsize, and sorting coefficient, represented by standard deviation.
Statement: The reef flat features moderately well-sorted coarse to very coarse sand. Although this data provides the average mean grainsize and sorting coefficient, there is great variation in grainsize and sorting. It is perhaps better to review individual samples in relation to their location. e.g. on the leeward, or on the windward portions of the reef flats.
Parameters: Average mean grainsize (phi), average sorting coefficient (phi), dominant coarse biota, dominant fine biota.
Notes
CreditFunded by The Australian Research Council (ARC)
Credit
The Australian National University (ANU)
The Australian National University (ANU)
Purpose
To provide an overview of the sedimentary zones of Wistari Reef. Conducted as part of a broader study looking at Holocene production and accumulation of sediments on Wistari Reef.
To provide an overview of the sedimentary zones of Wistari Reef. Conducted as part of a broader study looking at Holocene production and accumulation of sediments on Wistari Reef.
Issued: 06 06 2007
Data time period: 1998 to 1998
text: westlimit=151.5; southlimit=-24.5; eastlimit=153; northlimit=-23
Subjects
COASTAL PROCESSES |
Coral Reefs |
EARTH SCIENCE |
OCEANS |
Oceans | Marine Sediments | Sediment Grain Size |
dominant_coarse_biota |
dominant_fine_biota |
environment |
grainsize |
sorting_coefficient |
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Other Information
(ANU_Ryan_Rfft_1_data.xls)
global : 3a4eacd0-13c2-11dc-b213-00188b4c0af8
Identifiers
- global : 8749fec0-13c9-11dc-b213-00188b4c0af8
