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| Titel |
Combined landslide inventory and susceptibility assessment based on different mapping units: an example from the Flemish Ardennes, Belgium |
| VerfasserIn |
M. Eeckhaut, P. Reichenbach, F. Guzzetti, M. Rossi, J. Poesen |
| 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 (2009-03-31), S.507-521 |
| Datensatznummer |
250006718
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| Publikation (Nr.) |
 copernicus.org/nhess-9-507-2009.pdf |
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| Zusammenfassung |
| For a 277 km2 study area in the Flemish Ardennes, Belgium, a landslide
inventory and two landslide susceptibility zonations were combined to obtain
an optimal landslide susceptibility assessment, in five classes. For the
experiment, a regional landslide inventory, a 10 m × 10 m digital
representation of topography, and lithological and soil hydrological
information obtained from 1:50 000 scale maps, were exploited. In the study
area, the regional inventory shows 192 landslides of the slide type,
including 158 slope failures occurred before 1992 (model calibration set),
and 34 failures occurred after 1992 (model validation set). The study area
was partitioned in 2.78×106 grid cells and in 1927 topographic
units. The latter are hydro-morphological units obtained by subdividing slope
units based on terrain gradient. Independent models were prepared for the two
terrain subdivisions using discriminant analysis. For grid cells, a single
pixel was identified as representative of the landslide depletion area, and
geo-environmental information for the pixel was obtained from the thematic
maps. The landslide and geo-environmental information was used to model the
propensity of the terrain to host landslide source areas. For topographic
units, morphologic and hydrologic information and the proportion of
lithologic and soil hydrological types in each unit, were used to evaluate
landslide susceptibility, including the depletion and depositional areas.
Uncertainty associated with the two susceptibility models was evaluated, and
the model performance was tested using the independent landslide validation
set. An heuristic procedure was adopted to combine the landslide inventory
and the susceptibility zonations. The procedure makes optimal use of the
available landslide and susceptibility information, minimizing the
limitations inherent in the inventory and the susceptibility maps. For the
established susceptibility classes, regulations to link terrain domains to
appropriate land rules are proposed. |
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