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Runout analysis of a large rockfall in the Dolomites/Italian Alps using LIDAR derived particle sizes and shapes


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Haas, Florian ; Heckmann, Tobias ; Wichmann, Volker ; Becht, Michael:
Runout analysis of a large rockfall in the Dolomites/Italian Alps using LIDAR derived particle sizes and shapes.
In: Earth surface processes and landforms : the journal of the British Geomorphological Research Group. Bd. 37 (2012) Heft 13. - S. 1444-1455.
ISSN 0197-9337 ; 1096-9837


Link zum Volltext (externe URL): http://onlinelibrary.wiley.com/doi/10.1002/esp.329...


LiDAR data were used to quantify and analyse a rockfall event which occurred in 2003 in the Western Dolomites (Italian Alps). In addition to previously existing Airborne Laserscanning (ALS) data, high resolution Terrestrial Laserscanning (TLS) data were collected. By using the original point clouds, the volume, axial ratio and runout length of single boulders as well as the surface roughness in the runout zone of the rockfall were derived. The total volume of the rockfall event of approximately 10,000 m³ was estimated by a reconstruction of the pre-event surface at the detachment zone. The analysis of the laser scanning data of the accumulation zone revealed a power law scaling for boulder volumes larger than 8 m³. The dependence of runout length on boulder volume is complex; it is moderated by particle sphericity.
In addition, we used ALS and TLS data to derive the spatial distribution of surface roughness on the talus cone. TLS allow for more accurate roughness mapping than ALS data, but for most applications the point density of ALS data seems to be sufficiently high to derive measures of roughness. Different sampling approaches for plane fitting on the scale of 5 m did not show significant effects besides the computational time. The results of our analyses provide important perspectives for rockfall modelling and process understanding with potential applications in both ‘applied’ (natural hazards) and ‘pure’ geomorphological research.

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Zusätzliche Informationen:DOI: 10.1002/esp.3295
Schlagwörter:rockfall; LiDAR; terrestrial laserscanning; airborne laserscanning; modelling; Alps
Institutionen der Universität:Mathematisch-Geographische Fakultät > Geographie > Lehrstuhl für Physische Geographie
Titel an der KU entstanden:Ja
Eingestellt am:05. Jul 2012 09:27
Letzte Änderung:08. Jun 2016 12:41
URL zu dieser Anzeige:http://edoc.ku-eichstaett.de/9357/