Article (Scientific journals)
Combining spatial data in landslide reactivation susceptibility mapping: A likelihood ratio-based approach in W Belgium
Dewitte, Olivier; Chung, Chang-Jo; Cornet, Yves et al.
2010In Geomorphology
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Please cite this article as: Dewitte, O., et al., Combining spatial data in landslide reactivation susceptibility mapping: A likelihood ratio-based approach in W Belgium, Geomorphology (2010), doi:10.1016/j.geomorph.2010.06.010


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Keywords :
Landslide susceptibility mapping; Spatial data combination; Cross-validation; Expert knowledge; Landslide reactivation; Belgium
Abstract :
[en] A key issue in landslide susceptibility mapping concerns the relevance of the spatial data combination used in the prediction. Various combinations of high-resolution predictor variables and possibilities of selecting them from a larger dataset are analysed. The scarp reactivation of several landslides in a hilly region of W Belgium is investigated at the pixel scale. The usceptibility modelling uses the reactivated scarp segments as the dependent variable and 13 factors at a 2 m-resolution related to topography, hydrology, land use and lithology as potential independent variables. The modelling uses a likelihood ratio approach based on the comparison, for each independent variable, between two empirical distribution functions (EDFs), respectively for the reactivated and non-reactivated areas. It uses these EDFs as favourability values to build membership values and combine them with a fuzzy Gamma operator. Five different data combinations are tested and compared by analysing the prediction-rate curves obtained by cross-validation. The geomorphological value of the resulting susceptibility maps is also discussed. This research shows relevant results for predicting the susceptibility to scarp reactivation. We highlight the need for testing several data combinations and underline that combining uantitative criteria with expert opinion is an asset for reliable predictions.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Dewitte, Olivier ;  Université de Liège - ULiège > Département de géographie > Unité de géographie physique et quaternaire (UGPQ)
Chung, Chang-Jo;  University of Ottawa > Department of Earth Sciences
Cornet, Yves ;  Université de Liège - ULiège > Département de géographie > Unité de Géomatique - Télédétection et photogrammétrie
Daoudi, Mohamed
Demoulin, Alain ;  Université de Liège - ULiège > Département de géographie > Unité de géographie physique et quaternaire (UGPQ)
Language :
English
Title :
Combining spatial data in landslide reactivation susceptibility mapping: A likelihood ratio-based approach in W Belgium
Publication date :
2010
Journal title :
Geomorphology
ISSN :
0169-555X
eISSN :
1872-695X
Publisher :
Elsevier
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 09 July 2010

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