Authors / CoAuthors
Smith, Q.H.T. | Heap, A.D. | Nichol, S.L.
Abstract
Controls on the evolution of Tapora Island, an active barrier island located opposite the entrance to the Kaipara Harbour on the high-energy west coast of the North Island of New Zealand are identified. Subsurface facies form an aggradational barrier island succession from subtidal to subaerial elevations. These data, combined with surface samples and geomorphic and geologic relationships, indicate that Tapora Island is the most recent barrier island at this location in the estuary, and forms part of a prograded coast opposite the entrance. Wave data indicate that ocean swell waves penetrate the inlet for approximately two hours either side of high tide and are capable of transporting sand onto the island. The combined effects of swell waves, abundant sediment supply, and exposed aspect are the critical factors that have formed the barrier island. Despite the 'sheltered' estuarine setting, Tapora Island has formed under conditions that are more akin to open ocean coasts. The origin and development of Tapora Island broadly conforms to the accumulating barrier island model.
Product Type
nonGeographicDataset
eCat Id
67223
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
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2601
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Keywords
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- GA PublicationJournal
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- geomorphology
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- sedimentology
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- petrography
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- marine
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- NZ
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
Publication Date
2008-07-21T00:00:00
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geoscientificInformation
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