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Characterization of landslide ground surface kinematics from terrestrial laser scanning and strain field computation
Language
English
Obiettivo Specifico
7A. Geofisica per il monitoraggio ambientale
Status
Published
JCR Journal
JCR Journal
Peer review journal
Yes
Title of the book
Issue/vol(year)
/97 (2008)
Pages (printed)
424-437
Issued date
2008
Abstract
Assessment and mitigation of the risk induced by landslide activation need an appropriate phenomenon investigation, to obtain useful information about the failure processes. The first step is the complete kinematics characterization of the landslide ground surface, by evaluating the involved displacement and deformation patterns. A dense displacement field can be obtained from comparison of a series of multi-temporal observations performed by means of terrestrial laser scanning. Subsequently, the strain field can be computed from displacement vectors. In this paper, a modified least square technique is employed to compute the strain on the nodes of a regular grid (2D) approach) or on the points of a digital terrain model (3D) approach). Such a computation takes into account the displacements, their spatial distribution, as well as the measurement and modelling errors. A scale factor is introduced in order to emphasize the contributions of the experimental points on the basis of their distance from each computation point, and to recognize possible scale-depending behaviours. This method has been implemented in Matlab and applied on two landslides located in the northeastern Italian Alps (Lamosano and Perarolo di Cadore). The experiments show that different kinematics can be recognized, and the presence and influence of eventual discontinuities can be revealed
Type
article
File(s)
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Name
GEOMORPH_2008_gridstrain.pdf
Size
2.13 MB
Format
Adobe PDF
Checksum (MD5)
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