Natural Hazards and Earth System Science
www.nat-hazards-earth-syst-sci.net
1561-8633
1684-9981
9
3
2009
10.5194/nhess-9-1003-2009
http://www.nat-hazards-earth-syst-sci.net/9/1003/2009/
http://www.nat-hazards-earth-syst-sci.net/9/1003/2009/nhess-9-1003-2009.html
http://www.nat-hazards-earth-syst-sci.net/9/1003/2009/nhess-9-1003-2009.pdf
1003
1019
2009-06-26
Characterization and monitoring of the Ã…knes rockslide using terrestrial laser scanning
T. Oppikofer
thierry.oppikofer@unil.ch
M. Jaboyedoff
L. Blikra
M.-H. Derron
R. Metzger
Institute of Geomatics and Analysis of Risk (IGAR), University of Lausanne, Switzerland
Ã…knes/Tafjord Project, Stranda, Norway
Geological Survey of Norway (NGU), Trondheim, Norway
Terrestrial laser scanning (TLS) provides high-resolution point clouds of the
topography and new TLS instruments with ranges exceeding 300 m or even
1000 m are powerful tools for characterizing and monitoring slope movements.
This study focuses on the 35 million m<sup>3</sup> Ã…knes rockslide in Western
Norway, which is one of the most investigated and monitored rockslides in the
world. The TLS point clouds are used for the structural analysis of the
steep, inaccessible main scarp of the rockslide, including an assessment of
the discontinuity sets and fold axes. TLS acquisitions in 2006, 2007 and 2008
provide information on 3-D displacements for the entire scanned area and are
not restricted like conventional survey instruments to single measurement
points. The affine transformation matrix between two TLS acquisitions
precisely describes the rockslide displacements and enables their separation
into translational components, such as the displacement velocity and
direction, and rotational components, like toppling. This study shows the
ability of TLS to obtain reliable 3-D displacement information over a large,
unstable area. Finally, a possible instability model for the upper part of
Ã…knes rockslide explains the measured translational and rotational
displacements by a combination of southward planar sliding along the gneiss
foliation, gravitational vertical settlement along the complex, stepped basal
sliding surface and northward toppling toward the opened graben structure.
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