Nearshore hydrodynamics and morphological change around a coral reef sand cay, Tepuka, Tuvalu

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dc.contributor.advisor Kench, PS en
dc.contributor.advisor Ford, MR en Scott-Knight, Claire en 2016-09-08T21:27:31Z en 2016 en
dc.identifier.uri en
dc.description Full text is available to authenticated members of The University of Auckland only. en
dc.description.abstract Coral reef islands are products of the interaction between hydrodynamics, island morphology, and sediment transport processes (Kench et al., 2009a). These morphodynamic processes have typically been examined in terms of the interaction of waves with the reef edge and reef platform, with less emphasis on the measurements of wave characterisitcs in the nearshore which have greater influence on nearshore sediment transport processes (Beetham and Kench, 2014). This thesis details a study of reef island morphodynamics undertaken on Tepuka Island in Funafuti Atoll, Tuvalu, in which concurrent measurements of nearshore hydrodynamics and beach profile change were taken over a two week period in February 2015. Tepuka was influenced by northerly wind and swell throughout the study period, and this led to a north-south gradient in wave energy along the island. The greatest value of Hmax recorded was 1.24 m, on the northeastern aspect of Tepuka, while at the same time the southern end experienced an Hmax of 0.43 m. Along-shore currents were recorded travelling from north to south irrespective of tidal stage, although there was some reversal in current direction between low and rising tide. Measurements of beach profile change gave a net erosion for all except one of the five transects. The greatest net erosion was recorded at the north end of Tepuka, at -6.04 m2. In addition, sediments were observed to move landward on some parts of the island. Overall, this thesis has shown that the adjustment of shore face topography around Tepuka is highly influenced by the along-shore variations in wave energy. en
dc.publisher ResearchSpace@Auckland en
dc.relation.ispartof Masters Thesis - University of Auckland en
dc.relation.isreferencedby UoA99264888611402091 en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights Restricted Item. Available to authenticated members of The University of Auckland. en
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dc.rights.uri en
dc.title Nearshore hydrodynamics and morphological change around a coral reef sand cay, Tepuka, Tuvalu en
dc.type Thesis en Geography en The University of Auckland en Masters en
dc.rights.holder Copyright: The author en
pubs.elements-id 540917 en
pubs.record-created-at-source-date 2016-09-09 en

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