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| Titel |
Detection of millimetric deformation using a terrestrial laser scanner: experiment and application to a rockfall event |
| VerfasserIn |
A. Abellan, M. Jaboyedoff, T. Oppikofer, J. M. Vilaplana |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 9, no. 2 ; Nr. 9, no. 2 (2009-03-17), S.365-372 |
| Datensatznummer |
250006706
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| Publikation (Nr.) |
 copernicus.org/nhess-9-365-2009.pdf |
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| Zusammenfassung |
| Terrestrial laser scanning (TLS) is one of the most promising surveying
techniques for rockslope characterization and monitoring. Landslide and
rockfall movements can be detected by means of comparison of sequential
scans. One of the most pressing challenges of natural hazards is combined
temporal and spatial prediction of rockfall. An outdoor experiment was
performed to ascertain whether the TLS instrumental error is small enough to
enable detection of precursory displacements of millimetric magnitude.
This consists of a known displacement of three objects relative to a stable surface.
Results show that millimetric changes cannot be detected by the
analysis of the unprocessed datasets. Displacement measurement are improved
considerably by applying Nearest Neighbour (NN) averaging, which reduces the
error (1σ) up to a factor of 6. This technique was applied to
displacements prior to the April 2007 rockfall event at Castellfollit de la
Roca, Spain. The maximum precursory displacement measured was 45 mm,
approximately 2.5 times the standard deviation of the model comparison,
hampering the distinction between actual displacement and instrumental error
using conventional methodologies. Encouragingly, the precursory displacement
was clearly detected by applying the NN averaging method. These results show
that millimetric displacements prior to failure can be detected using TLS. |
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