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Titel |
Sensitivity study of the Storegga Slide tsunami using retrogressive and visco-plastic rheology models |
VerfasserIn |
Jihwan Kim, Finn Løvholt |
Konferenz |
EGU General Assembly 2016
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Medientyp |
Artikel
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Sprache |
en
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 18 (2016) |
Datensatznummer |
250126267
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Publikation (Nr.) |
EGU/EGU2016-5965.pdf |
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Zusammenfassung |
Enormous submarine landslides having volumes up to thousands of km3 and long
run-out may cause tsunamis with widespread effects. Clay-rich landslides, such
as Trænadjupet and Storegga offshore Norway commonly involve retrogressive
mass and momentum release mechanisms that affect the tsunami generation. As
a consequence, the failure mechanisms, soil parameters, and release rate of the
retrogression are of importance for the tsunami generation. Previous attempts to
model the tsunami generation due to retrogressive landslides are few, and limited
to idealized conditions. Here, a visco-plastic model including additional effects
such as remolding, time dependent mass release, and hydrodynamic resistance, is
employed for simulating the Storegga Slide. As landslide strength parameters and
their evolution in time are uncertain, it is necessary to conduct a sensitivity study
to shed light on the tsunamigenic processes. The induced tsunami is simulated
using Geoclaw. We also compare our tsunami simulations with recent analysis
conducted using a pure retrogressive model for the landslide, as well as previously
published results using a block model. The availability of paleotsunami run-up data and
detailed slide deposits provides a suitable background for improved understanding of
the slide mechanics and tsunami generation. The research leading to these results
has received funding from the Research Council of Norway under grant number
231252 (Project TsunamiLand) and the European Union’s Seventh Framework
Programme (FP7/2007-2013) under grant agreement 603839 (Project ASTARTE). |
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