The University of Southampton
University of Southampton Institutional Repository

A Numerical Investigation of Sediment Destructuring as a Potential Globally Widespread Trigger for Large Submarine Landslides on Low Gradients

A Numerical Investigation of Sediment Destructuring as a Potential Globally Widespread Trigger for Large Submarine Landslides on Low Gradients
A Numerical Investigation of Sediment Destructuring as a Potential Globally Widespread Trigger for Large Submarine Landslides on Low Gradients
Submarine landslides on open continental slopes can be far larger than any slope failure on land and occur in locations worldwide on gradients of <2°. Significantly elevated pore pressure is necessary to overcome the sediment’s shearing resistance on such remarkably low gradients, but the processes causing such overpressure generation are contentious, especially in areas with slow sedimentation rates. Here we propose that the progressive loss of interparticle bonding and fabric could cause such high excess pore pressure. Slow sedimentation may favour the formation of a structural framework in the sediment that is load-bearing until yield stress is reached. The bonds then break down, causing an abrupt porosity decrease and consequently overpressure as pore fluid cannot escape sufficiently rapidly. To test this hypothesis, we implement such a loss of structure into a 2D fully coupled stress-fluid flow Finite Element model of a submerged low angle slope, and simulate consolidation due to slow sedimentation. The results suggest that destructuring could indeed be a critical process for submarine slope stability.
978-3-319-00971-1
37
177-188
Springer International
Urlaub, M.
7dd888d5-083c-490d-9fe5-1d13bd7f08e7
Talling, P.
1cbac5ec-a9f8-4868-94fe-6203f30b47cf
Zervos, A.
9e60164e-af2c-4776-af7d-dfc9a454c46e
Krastel, S.
Behrmann, J-H.
Volker, D.
Stipp, M.
Berndt, C.
Urgeles, R.
Chaytor, J.
Huhn, K.
Strasser, M.
Harbitz, C.B.
Urlaub, M.
7dd888d5-083c-490d-9fe5-1d13bd7f08e7
Talling, P.
1cbac5ec-a9f8-4868-94fe-6203f30b47cf
Zervos, A.
9e60164e-af2c-4776-af7d-dfc9a454c46e
Krastel, S.
Behrmann, J-H.
Volker, D.
Stipp, M.
Berndt, C.
Urgeles, R.
Chaytor, J.
Huhn, K.
Strasser, M.
Harbitz, C.B.

Urlaub, M., Talling, P. and Zervos, A. (2014) A Numerical Investigation of Sediment Destructuring as a Potential Globally Widespread Trigger for Large Submarine Landslides on Low Gradients. In, Krastel, S., Behrmann, J-H., Volker, D., Stipp, M., Berndt, C., Urgeles, R., Chaytor, J., Huhn, K., Strasser, M. and Harbitz, C.B. (eds.) Submarine Mass Movements and Their Consequences: 6th International Symposium. (Advances in Natural and Technological Hazards Research, 37) Cham,Switzerland. Springer International, pp. 177-188. (doi:10.1007/978-3-319-00972-8_16).

Record type: Book Section

Abstract

Submarine landslides on open continental slopes can be far larger than any slope failure on land and occur in locations worldwide on gradients of <2°. Significantly elevated pore pressure is necessary to overcome the sediment’s shearing resistance on such remarkably low gradients, but the processes causing such overpressure generation are contentious, especially in areas with slow sedimentation rates. Here we propose that the progressive loss of interparticle bonding and fabric could cause such high excess pore pressure. Slow sedimentation may favour the formation of a structural framework in the sediment that is load-bearing until yield stress is reached. The bonds then break down, causing an abrupt porosity decrease and consequently overpressure as pore fluid cannot escape sufficiently rapidly. To test this hypothesis, we implement such a loss of structure into a 2D fully coupled stress-fluid flow Finite Element model of a submerged low angle slope, and simulate consolidation due to slow sedimentation. The results suggest that destructuring could indeed be a critical process for submarine slope stability.

This record has no associated files available for download.

More information

Published date: 2014
Organisations: Infrastructure Group, Marine Geoscience, Civil Maritime & Env. Eng & Sci Unit

Identifiers

Local EPrints ID: 362806
URI: http://eprints.soton.ac.uk/id/eprint/362806
ISBN: 978-3-319-00971-1
PURE UUID: 0ee25e1e-ee2c-40df-9241-8677bc3cdbc7
ORCID for A. Zervos: ORCID iD orcid.org/0000-0002-2662-9320

Catalogue record

Date deposited: 06 Mar 2014 15:05
Last modified: 09 Jan 2022 03:12

Export record

Altmetrics

Contributors

Author: M. Urlaub
Author: P. Talling
Author: A. Zervos ORCID iD
Editor: S. Krastel
Editor: J-H. Behrmann
Editor: D. Volker
Editor: M. Stipp
Editor: C. Berndt
Editor: R. Urgeles
Editor: J. Chaytor
Editor: K. Huhn
Editor: M. Strasser
Editor: C.B. Harbitz

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 http://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.

×