Evidence of aeolian sediment transport across an Ammophila arenaria‐dominated foredune,Mason Bay,Stewart Island |
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| Authors: | Philip S Petersen Michael J Hilton Sarah J Wakes |
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| Institution: | 1. Department of Geography, University of Otago, PO Box 56, Dunedin, New Zealand;2. Department of Applied Sciences, University of Otago, PO Box 56, Dunedin, New Zealand |
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| Abstract: | Aeolian sedimentation across an Ammophila arenaria‐dominated foredune was assessed for eight months using sand traps. This research aimed to ascertain if such foredunes act as a barrier to transport between beaches and hinterland dune systems. At Mason Bay, sand was transported across the foredune at rates of up to 10 kg.hour?1per 100 m length of coast at wind velocities of 31 m.s?1. Results were compared with computational fluid dynamics modelled airflows and foredune volume changes. Saltation was important for up to 17 m past the stoss face. Rates of transport were well short of rates of volume gain. Approximately 2% or less of stoss face suspended sediment transport reached the hinterland. The foredune is primarily a sand sink. |
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| Keywords: | accretion airflow Ammophila arenaria foredune suspension |
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