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

Auteur(s) et Affiliation(s)

HAAS, F.

Catholic Univ., Dep. of Physical Geography, Eichstaett, Allemagne

HECKMANN, T.

Catholic Univ., Dep. of Physical Geography, Eichstaett, Allemagne

WICHMANN, V.

alp-S Center for Climate Change Adaptation Technologies, Innsbruck, Autriche

BECHT, M.

Catholic Univ., Dep. of Physical Geography, Eichstaett, Allemagne

Description :
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 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. In addition, the AA. 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.

Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2012, vol. 37, n°. 13, p. 1444-1455, nombre de pages : 12, Références bibliographiques : 2 p.

Date :
2012

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais