M.A. Clare
Preconditioning and triggering of offshore slope failures and turbidity currents revealed by most detailed monitoring yet at a fjord-head delta
Clare, M.A.; Hughes Clarke, J.E.; Talling, P.T.; Cartigny, M.J.B.; Pratomo, D.G.
Authors
J.E. Hughes Clarke
Professor Peter Talling peter.j.talling@durham.ac.uk
Professor
Dr Matthieu Cartigny matthieu.j.cartigny@durham.ac.uk
Associate Professor
D.G. Pratomo
Abstract
Rivers and turbidity currents are the two most important sediment transport processes by volume on Earth. Various hypotheses have been proposed for triggering of turbidity currents offshore from river mouths, including direct plunging of river discharge, delta mouth bar flushing or slope failure caused by low tides and gas expansion, earthquakes and rapid sedimentation. During 2011, 106 turbidity currents were monitored at Squamish Delta, British Columbia. This enables statistical analysis of timing, frequency and triggers. The largest peaks in river discharge did not create hyperpycnal flows. Instead, delayed delta-lip failures occurred 8–11 h after flood peaks, due to cumulative delta top sedimentation and tidally-induced pore pressure changes. Elevated river discharge is thus a significant control on the timing and rate of turbidity currents but not directly due to plunging river water. Elevated river discharge and focusing of river discharge at low tides cause increased sediment transport across the delta-lip, which is the most significant of all controls on flow timing in this setting.
Citation
Clare, M., Hughes Clarke, J., Talling, P., Cartigny, M., & Pratomo, D. (2016). Preconditioning and triggering of offshore slope failures and turbidity currents revealed by most detailed monitoring yet at a fjord-head delta. Earth and Planetary Science Letters, 450, 208-220. https://doi.org/10.1016/j.epsl.2016.06.021
Journal Article Type | Article |
---|---|
Acceptance Date | Jun 15, 2016 |
Online Publication Date | Jul 5, 2016 |
Publication Date | Sep 15, 2016 |
Deposit Date | Oct 24, 2016 |
Publicly Available Date | Dec 14, 2016 |
Journal | Earth and Planetary Science Letters |
Print ISSN | 0012-821X |
Electronic ISSN | 1385-013X |
Publisher | Elsevier |
Peer Reviewed | Peer Reviewed |
Volume | 450 |
Pages | 208-220 |
DOI | https://doi.org/10.1016/j.epsl.2016.06.021 |
Public URL | https://durham-repository.worktribe.com/output/1402376 |
Related Public URLs | http://nora.nerc.ac.uk/id/eprint/513855/ |
Files
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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/
Copyright Statement
© 2016 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license
(http://creativecommons.org/licenses/by/4.0/).
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