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RRS Charles Darwin Cruise CD157, 28 May - 13 June 2004. Sediment transport through the Setubal and Nazare Canyons

Weaver, P.P.E. (2004) RRS Charles Darwin Cruise CD157, 28 May - 13 June 2004. Sediment transport through the Setubal and Nazare Canyons , Southampton, UK Southampton Oceanography Centre 27pp. (Southampton Oceanography Centre Cruise Report, 49).

Record type: Monograph (Project Report)

Abstract

The main objective of the cruise was to groundtruth the sidescan sonar coverage of the Setubal and Nazare Canyons that was collected on the RV Pelagia in November 2003. A range of corers including box, mega, kastenlot and piston provided a range of possibilities to core sediment of varying grainsize from gravel to mud. In addition a deeptowed profiler was used to collect subsurface profiles across the canyons, but plans to use SHRIMP were abandoned due to problems with the conducting cable.

The coring was a success given the difficult topography; site location was aided by the TOBI sidescan survey completed in 2003, making it possible to hit relatively small targets just a few hundred metres across. Careful choice of corer type ensured core recovery in the sequence of mixed sands and muds. No corers worked well in the Nazare thalweg due to presumed hard or sandy seabed.

The data will be used to groundtruth the TOBI sidescan and to determine the flux of sediment through the Setubal and Nazare Canyons. Initial interpretations suggest significant differences between the canyons and strong changes in the amount of activity with time.

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More information

Published date: 2004
Keywords: Charles Darwin, cruise CD157 2004, EUROSTRATAFORM, Iberia, Nazare Canyon, Portugal, sediment cores, Setubal Canyon, submarine canyons

Identifiers

Local EPrints ID: 14006
URI: http://eprints.soton.ac.uk/id/eprint/14006
PURE UUID: 29e76375-29e5-4c58-a704-bbea86d9ba21

Catalogue record

Date deposited: 14 Jan 2005
Last modified: 17 Jul 2017 16:59

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Contributors

Author: P.P.E. Weaver

University divisions

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