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The tidal characteristics and shallow-marine seagrass sedimentology of Robbins Passage and Boullanger bay, far northwest Tasmania

Citation

Donaldson, P and Sharples, C and Anders, RJ, The tidal characteristics and shallow-marine seagrass sedimentology of Robbins Passage and Boullanger bay, far northwest Tasmania, Cradle Coast Natural Resource Management (2012) [Contract Report]


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Abstract

This natural resource management research project was initiated by the Cradle Coast NRM, in response to the knowledge gaps identified by the Blue Wren Group in understanding elements of Robbins Passage-Boullanger Bay (RP-BB) coastal processes.

The purpose of this study was to:

• Improve the understanding of RP-BB tides, based on observational data, and
• Investigate the carbon sequestration potential and palaeo-environmental evolution of RP-BB shallow seagrass beds, based   on a set of shallow marine sediment cores.

The key findings of this report are:

• RP-BB receives strongly semi-diurnal meso-tides which vary in their range and time of arrival
• Predicted mean spring tide ranges and total tide ranges were found to be 2.80 m and 3.15 m at Howie Island, 2.20 m and   2.63 m at Kangaroo Island, and 2.01 m and 2.42 at Welcome Inlet
• The National Tide Centre’s modelled tide range was found to underestimate the tide range for eastern Boullanger Bay by   approximately 30%
• Three unique sedimentary deposits (i.e. facies) were identified in the sediment cores, interpreted as a Late Pleistocene   alluvial/lacustrine deposit (SF1), Mid-Holocene intertidal or shallow subtidal sand flats (SF2), and Mid-Late Holocene   seagrass associated deposits (SF3
• Large carbon rich sediment deposits exist beneath the subtidal seagrass meadows at RP-BB
• RP-BB Posidonia australis dominated subtidal seagrass meadows are highly effective at sequestering carbon.

Item Details

Item Type:Contract Report
Keywords:Robbins Passage, Boullanger Bay, natural resource management, coastal processes, tides, carbon sequestration potential, palaeo-environmental evolution, seagrass beds, sediment cores
Research Division:Earth Sciences
Research Group:Physical Geography and Environmental Geoscience
Research Field:Physical Geography and Environmental Geoscience not elsewhere classified
Objective Division:Environment
Objective Group:Ecosystem Assessment and Management
Objective Field:Ecosystem Assessment and Management of Marine Environments
Author:Donaldson, P (Mr Paul Donaldson)
Author:Sharples, C (Mr Chris Sharples)
Author:Anders, RJ (Mr Robert Anders)
ID Code:81151
Year Published:2012
Deposited By:Geography and Environmental Studies
Deposited On:2012-11-23
Last Modified:2012-12-12
Downloads:5 View Download Statistics

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