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Strategies to estimate ground susceptibility to landslide reactivation. A probabilistic application in W Belgium (Oudenaarde)
Dewitte, Olivier; Chung, Chang-Jo; Cornet, Yves et al.
2007
Peer reviewed
 

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Keywords :
Landslide reactivation; susceptibility; probability; fuzzy set membership function
Abstract :
[en] In the hilly region of the Flemish Ardennes in western Belgium, no new big deep-seated landslides have occurred for decades, whereas several reactivation episodes were recently observed in ancient landslides. We selected a test area comprised of 13 rotational landslides located close to the town of Oudenaarde in order to predict the susceptibility of their main scarp to retreat. We propose here two probabilistic models based on a fuzzy set approach. The models use empirical distribution functions (EDFs) as favourability values to build membership values and combine them by using the fuzzy Gamma operator. Based on Kolmogorov-Smirnov tests applied to these EDFs to select the most relevant data, a first model was obtained bases on a combination of 5 quantitative variables: slope angle, distance from cultivation located upstream of the main scarp, slope aspect, elevation and profile curvature. Another, more empirical approach based on the a posteriori analysis of the prediction-rate curves was applied to select the 4 variables of a second model: slope aspect, plan curvature, vegetation index and focal flow. According to the prediction-rate curves and the resulting susceptibility maps, the empirical model appears more efficient in locating the main scarp areas most prone to reactivation.
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;  Université de Liège - ULiège > Département de géographie > Cartographie et systèmes d'information géographique
Cornet, Yves ;  Université de Liège - ULiège > Département de géographie > Unité de géographie physique et quaternaire (UGPQ)
Demoulin, Alain 
Language :
English
Title :
Strategies to estimate ground susceptibility to landslide reactivation. A probabilistic application in W Belgium (Oudenaarde)
Publication date :
2007
Event name :
Society for Mathematical Geology XIth International Congress
Event organizer :
ULg - Université de Liège
Event place :
Liège, Belgium
Event date :
3-8 septembre 2006
Audience :
International
Pages :
S09-10
Peer reviewed :
Peer reviewed
Available on ORBi :
since 10 February 2009

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