The University of Southampton
University of Southampton Institutional Repository

Turbidity current sediment waves on the submarine slopes of the western Canary Islands

Turbidity current sediment waves on the submarine slopes of the western Canary Islands
Turbidity current sediment waves on the submarine slopes of the western Canary Islands
Two sediment wave fields have been identified on the flanks of the western Canary Islands of La Palma and El Hierro, using a high-quality 2-D and 3-D dataset that includes GEOSEA and TOBI imagery, 3.5-kHz profiles, and short sediment cores. The La Palma sediment wave field covers some 20,000 km2 of the continental slope and rise, and consists of sediment waves with wave heights of up to 70 m and wavelengths of up to 2.4 km. The wave crestlines have a complex morphology, with common bifurcation and a clear sinuosity. Waves have migrated upslope through time. Cores recovered from the wave field contain volcaniclastic turbidites interbedded with pelagic/hemipelagic layers. The wave field is interpreted as having formed beneath unconfined turbidity currents. A simple, previously published, two-layer model is applied to the waves, revealing that they formed beneath turbidity currents flowing at 10–100 cm/s?1, with a flow thickness of 60–400 m and a sediment concentration of 26–427 mg/l. The El Julan sediment wave field lies within a turbidity current channel on the southwest flank of El Hierro. The sediment waves display wave heights of about 6 m and wavelengths of up to 1.2 km. The waves are migrating upslope, and migration is most rapid in the centre of the channel where the flow velocity is highest. This wave field has been formed by channelised turbidity currents originating on the flanks of El Hierro.
CANARY ISLAND WATERS, SLOPES, GEOSEA, TOBI, TURBIDITY CURRENTS, LA PALMA, SEDIMENT TRANSPORT, SEDIMENTS, WAVE FIELDS, EL JULAN
0025-3227
185-198
Wynn, R.B.
72ccd765-9240-45f8-9951-4552b497475a
Masson, D.G.
edd44c8b-38ca-45fb-8d0d-ac8365748a45
Stow, D.A.V.
434350cd-0ae5-4bb3-b71f-e1da90587f74
Weaver, P.P.E.
1ab10035-6132-46aa-8a5c-6fb23a1b8ab4
Wynn, R.B.
72ccd765-9240-45f8-9951-4552b497475a
Masson, D.G.
edd44c8b-38ca-45fb-8d0d-ac8365748a45
Stow, D.A.V.
434350cd-0ae5-4bb3-b71f-e1da90587f74
Weaver, P.P.E.
1ab10035-6132-46aa-8a5c-6fb23a1b8ab4

Wynn, R.B., Masson, D.G., Stow, D.A.V. and Weaver, P.P.E. (2000) Turbidity current sediment waves on the submarine slopes of the western Canary Islands. Marine Geology, 163 (1-4), 185-198. (doi:10.1016/S0025-3227(99)00101-2).

Record type: Article

Abstract

Two sediment wave fields have been identified on the flanks of the western Canary Islands of La Palma and El Hierro, using a high-quality 2-D and 3-D dataset that includes GEOSEA and TOBI imagery, 3.5-kHz profiles, and short sediment cores. The La Palma sediment wave field covers some 20,000 km2 of the continental slope and rise, and consists of sediment waves with wave heights of up to 70 m and wavelengths of up to 2.4 km. The wave crestlines have a complex morphology, with common bifurcation and a clear sinuosity. Waves have migrated upslope through time. Cores recovered from the wave field contain volcaniclastic turbidites interbedded with pelagic/hemipelagic layers. The wave field is interpreted as having formed beneath unconfined turbidity currents. A simple, previously published, two-layer model is applied to the waves, revealing that they formed beneath turbidity currents flowing at 10–100 cm/s?1, with a flow thickness of 60–400 m and a sediment concentration of 26–427 mg/l. The El Julan sediment wave field lies within a turbidity current channel on the southwest flank of El Hierro. The sediment waves display wave heights of about 6 m and wavelengths of up to 1.2 km. The waves are migrating upslope, and migration is most rapid in the centre of the channel where the flow velocity is highest. This wave field has been formed by channelised turbidity currents originating on the flanks of El Hierro.

Full text not available from this repository.

More information

Published date: 2000
Keywords: CANARY ISLAND WATERS, SLOPES, GEOSEA, TOBI, TURBIDITY CURRENTS, LA PALMA, SEDIMENT TRANSPORT, SEDIMENTS, WAVE FIELDS, EL JULAN

Identifiers

Local EPrints ID: 8954
URI: https://eprints.soton.ac.uk/id/eprint/8954
ISSN: 0025-3227
PURE UUID: 14335e2b-e553-4591-affa-ec2b8a24b7af

Catalogue record

Date deposited: 10 Sep 2004
Last modified: 17 Jul 2017 17:12

Export record

Altmetrics

Contributors

Author: R.B. Wynn
Author: D.G. Masson
Author: D.A.V. Stow
Author: P.P.E. Weaver

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×