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| Titel |
Geomorphological mapping and geophysical profiling for the evaluation of natural hazards in an alpine catchment |
| VerfasserIn |
A. C. Seijmonsbergen, L. W. S. Graaff |
| 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 ; 6, no. 2 ; Nr. 6, no. 2 (2006-03-15), S.185-193 |
| Datensatznummer |
250003397
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| Publikation (Nr.) |
 copernicus.org/nhess-6-185-2006.pdf |
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| Zusammenfassung |
| Liechtenstein has faced an increasing number of natural hazards over recent
decades: debris flows, slides, snow avalanches and floods repeatedly
endanger the local infrastructure. Geomorphological field mapping and
geo-electrical profiling was used to assess hazards near Malbun, a village
potentially endangered by landslides, and especially debris flows. The area
is located on the tectonic contacts of four different nappe slices. The
bedrock consists of anhydrite and gypsum, dolomite, shale, marl, and
limestone. The spatial distribution and occurrence of debris flows and
slides is evaluated through a combination of geomorphological expert
knowledge, and detailed visualization in a geographical information system.
In a geo-database a symbol-based 1:3000 scale geomorphological map has been
digitized and rectified into polygons. The polygons include information on
the main geomorphological environment, the Quaternary material distribution
and of geomorphological processes, which are stored in attribute tables. The
spatial distribution of these attributes is then combined with geophysical
information and displacement rates interpolated from benchmark measurements.
On one of the landslides two geo-electrical profiles show that the distance
to a potential failure plane varies between 10-20 m and that the topography
of the failure plane is influenced by subterranean gypsum karst features.
The displacement measurements show that this landslide actively
disintegrates into minor slides and is not, therefore, a risk to the village
of Malbun. The hazard zonation indicates that debris flows can pose a risk
if no countermeasures are taken. Gypsum karst may locally accelerate the
landslide activity. In contrast, the impact of debris flows is diminished
because collapse dolines may act as sediment traps for the debris flow
materials. This research illustrates how geomorphological expert knowledge
can be integrated in a GIS for the evaluation of natural hazards on a
detailed scale. |
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