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Nat. Hazards Earth Syst. Sci., 9, 1087-1094, 2009
https://doi.org/10.5194/nhess-9-1087-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.
 
07 Jul 2009
LiDAR for monitoring mass movements in permafrost environments at the cirque Hinteres Langtal, Austria, between 2000 and 2008
M. Avian1, A. Kellerer-Pirklbauer2, and A. Bauer3 1Institute for Remote Sensing and Photogrammetry, Graz University of Technology, Graz, Austria
2Institute for Geography and Regional Science, University of Graz, Graz, Austria
3Institute for Digital Image Processing, JOANNEUM RESEARCH Graz, Graz, Austria
Abstract. Permafrost areas receive more and more attention in terms of natural hazards in recent years due to ongoing global warming. Active rockglaciers are mixtures of debris and ice (of different origin) in high-relief environments indicating permafrost conditions for a substantial period of time. Style and velocity of the downward movement of this debris-ice-mass is influenced by topoclimatic conditions. The rockglacier Hinteres Langtalkar is stage of extensive modifications in the last decade as a consequence of an extraordinary high surface movement. Terrestrial laserscanning (or LiDAR) campaigns have been out once or twice per year since 2000 to monitor surface dynamics at the highly active front of the rockglacier. High resolution digital terrain models are the basis for annual and inter-annual analysis of surface elevation changes. Results show that the observed area shows predominantly positive surface elevation changes causing a consequent lifting of the surface over the entire period. Nevertheless a decreasing surface lifting of the observed area in the last three years leads to the assumption that the material transport from the upper part declines in the last years. Furthermore the rockglacier front is characterized by extensive mass wasting and partly disintegration of the rockglacier body. As indicated by the LiDAR results as well as from field evidence, this rockglacier front seems to represent a permafrost influenced landslide.

Citation: Avian, M., Kellerer-Pirklbauer, A., and Bauer, A.: LiDAR for monitoring mass movements in permafrost environments at the cirque Hinteres Langtal, Austria, between 2000 and 2008, Nat. Hazards Earth Syst. Sci., 9, 1087-1094, https://doi.org/10.5194/nhess-9-1087-2009, 2009.
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