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| Titel |
A simple qualitative approach for mapping regional landslide susceptibility in the Faroe Islands |
| VerfasserIn |
M.-P. J. Dahl, L. E. Mortensen, A. Veihe, N. H. Jensen |
| 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 ; 10, no. 2 ; Nr. 10, no. 2 (2010-02-01), S.159-170 |
| Datensatznummer |
250007922
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| Publikation (Nr.) |
 copernicus.org/nhess-10-159-2010.pdf |
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| Zusammenfassung |
| The Faroe Islands in the North Atlantic Ocean are highly susceptible to
landslides. Following recent landslide incidents, Jarðfeingi (Faroese Earth
and Energy Directorate) has pointed out, that the risk of
human lives or of property being lost or affected by landslides may be
increasing. This paper aims at presenting and testing a simple qualitative
approach for mapping regional landslide susceptibility in the Faroe Islands,
using few key parameters. The susceptibility model holds information about
both landslide initiation areas and runout zones. Landslide initiation areas
are determined from slope angle thresholds (25°–40°) and soil cover
data, while runout zones are delineated using the angle of reach approach
taking into account the presence/absence of geological benches in the runout
path, which has not been considered in earlier studies. Data input is
obtained from a landslide database containing 67 debris flows throughout the
Faroe Islands. Angle of reach values differ significantly with the
presence/absence of geological benches in the runout path. Two values of
angle of reach, 21.5° and 27.6°, are used for calculating runout
zones. The landslide susceptibility model is tested in a study area at the
town of Klaksvík in the northern part of the Faroe Islands. A map
validation comparing predicted susceptibility zones with a
validation-dataset of 87 actual landslides in the study area reveal that
69% and 92%, respectively, of actual landslide initiation areas and
runout zones are correctly predicted. Moreover 87% of the actual
landslides are included in the overall predicted landslide susceptibility
areas. |
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