International Geologiical Congress - Oslo 2008

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GHZ-11 Rock slope movements and early warning of catastrophic failure and related tsunamis

 

Modelling the tsunami from the potential Åkneset rock slide, western Norway

 

Sylfest Glimsdal, Norwegian Geotechnical Institute (NGI) and International Centre for Geohazards (ICG) (Norway)
Carl B. Harbitz, Norwegian Geotechnical Institute (NGI) and International Centre for Geohazards (ICG) (Norway)
Peter Gauer, Norwegian Geotechnical Institute (NGI) and International Centre for Geohazards (ICG) (Norway)
Ulrik Domaas, Norwegian Geotechnical Institute (NGI) and International Centre for Geohazards (ICG) (Norway)
Gunnstein Sælevik, Department of Mathematics, Univeristy of Oslo and ICG (Norway)
Atle Jensen, Department of Mathematics, Univeristy of Oslo and ICG (Norway)
 

 

A major unstable volume has been detected in the rock slope at Åkneset in the narrow fjord Sunnylvsfjorden, Western Norway. If large parts of the unstable masses are released as a whole, the slide will generate a tsunami that may be devastating to several settlements along the fjord. Assumed complex deformation, high speeds, large volumes, and steep fronts of the rock slide make the modelling of the tsunami generation and subsequent propagation a challenging task.
Our work attempts to model the rock side and the generation and propagation of the tsunami by applying (1) numerical rock slide models, (2) numerical wave models, and (3) laboratory experiments in both 2D and 3D.
An overview of both the numerical modelling and the laboratory experiments will be presented. Special attention is devoted to the use of experimental data as input to and validation of the numerical simulations. Further, the sensitivity to the most critical parameters for both the slide and the tsunami modelling as well as to the applied mathematical wave models will be discussed.

 

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