dc.contributor.advisor |
Strachan, L |
en |
dc.contributor.advisor |
Bostock, H |
en |
dc.contributor.advisor |
Bowen, M |
en |
dc.contributor.author |
Nokes, Cowan |
en |
dc.date.accessioned |
2014-07-07T05:38:15Z |
en |
dc.date.issued |
2014 |
en |
dc.identifier.citation |
2014 |
en |
dc.identifier.uri |
http://hdl.handle.net/2292/22428 |
en |
dc.description |
Full text is available to authenticated members of The University of Auckland only. |
en |
dc.description.abstract |
The North Canterbury Shelf is a highly complex and dynamic, rapidly evolving depositional environment. The study of continental shelf sediment transport, allows for predictions of source sediment for submarine canyons like the Kaikoura Canyon which feeds the Hikurangi Trough. This study aims to characterize the sediment delivery pathways on the Canterbury shelf between Banks Peninsula and Kaikoura, from the last glacial maximum until today. The study utilised surface samples, shallow cores, bathymetry data, 3.5Hz seismic reflection data and a regional oceanographic modelling system. A multi-raster sediment distribution map, sediment budget and sediment transport model detail: the extent, characteristics, rate of erosion, rate of deposition, sediment pathways and seasonal variations in the transport mechanisms, of the post-glacial sediments on the North Canterbury Shelf. The seafloor sediments on the inner shelf, up to 15km offshore, north of Pegasus Bay to Kaikoura is dominated by coarse sand and gravel. The hydraulic regime cannot support transport of this coarser material further offshore and it is transported north via long shore drift. The post glacial sediment wedge takes the form of a wide sandy-mud bank and extends north from the northern shoreline of Banks Peninsula, reaching a maximum thickness of 43m on the midshelf, 40km off shore central Pegasus Bay. The northerly dominant currents are accelerated around the constricting Banks Peninsula. Suspended load is transported north around Banks Peninsula is deposited in a zone extending north from Banks Peninsula at a rate of 5.23 x 106 m3/y. The outer shelf consists of medium sand to gravel sized sediments. The outer shelf sediments are larger relict material reworked with finer modern sediments. The Pegasus, Okains and Pukaki canyons, incising the North Canterbury Shelf, have become dormant. The rise in sea level since the last glacial maximum has created oceanic conditions unable to supply sufficient sediments. Sediments transported north are now deposited on the sandy-mud bar extending north from Banks Peninsula or continue north into the Conway Trough and Kaikoura Canyon. |
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dc.publisher |
ResearchSpace@Auckland |
en |
dc.relation.ispartof |
Masters Thesis - University of Auckland |
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 |
dc.rights.uri |
https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm |
en |
dc.rights.uri |
http://creativecommons.org/licenses/by-nc-sa/3.0/nz/ |
en |
dc.title |
Quaternary Sediment Distribution and Transport Pathways over the North Canterbury Shelf |
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dc.type |
Thesis |
en |
thesis.degree.grantor |
The University of Auckland |
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thesis.degree.level |
Masters |
en |
dc.rights.holder |
Copyright: The Author |
en |
pubs.elements-id |
445265 |
en |
pubs.record-created-at-source-date |
2014-07-07 |
en |
dc.identifier.wikidata |
Q112906535 |
|