Combining in situ monitoring using seabed instruments and numerical modelling to assess the transient stability of underwater slopes.

Urlaub, Morelia and Villinger, Heinrich (2018) Combining in situ monitoring using seabed instruments and numerical modelling to assess the transient stability of underwater slopes. Open Access In: Subaqueous Mass Movements and Their Consequences: Assessing Geohazards, Environmental Implications and Economic Significance of Subaqueous Landslides. , ed. by Lintern, D. G.. Geological Society of London Special Publications, 477 . Geological Society, London, Chapter 8. DOI 10.1144/SP477.8.

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Abstract

The stability of submarine slopes is often characterized using campaign-based geophysical and geotechnical measurements in combination with numerical modelling. However, such one-off measurements do not reflect transient changes in slope stability. In situ monitoring of physical parameters critical for slope stability over periods of months to years can provide crucial information on slope stability and can also be used in an early-warning system for submarine landslides and the possibly resulting tsunamis. We review existing techniques that are capable of monitoring seafloor deformation over long periods of time. Based on numerical models we can identify the magnitude of parameters related to landslide-induced seafloor deformation. Simulations of three different failure scenarios up to the point of failure show that the development of the stress state of a slope and hence stability over time can be captured by measurements of tilt, pressure and strain at the seafloor. We also find that different failure mechanisms induce different deformation signals at the seafloor, in particular tilt. Hence, with a site- and target-specific survey design (or a large pool of instruments), seafloor deformation measurements in combination with numerical modelling can be used to determine the temporal evolution of slope stability as well as to identify underlying failure mechanisms.

Document Type: Book chapter
Keywords: in situ monitoring, seabed instruments, numerical modelling, transient stability, underwater slopes
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
DOI etc.: 10.1144/SP477.8
ISSN: 0375-6440
Projects: Future Ocean, Future Ocean CP1635 "Towards real-time monitoring of submarine landslides"
Date Deposited: 19 Dec 2017 12:11
Last Modified: 07 Mar 2019 00:38
URI: http://oceanrep.geomar.de/id/eprint/40641

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