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Mapping areas of potential slope failures in cohesive soils using a shadow-casting algorithm – A case study from SW Sweden

Journal article
Authors Fredrik Lindberg
Mats Olvmo
Karin Bergdahl
Published in Computers and Geotechnics
Volume 38
Pages 791-799
Publication year 2011
Published at Department of Earth Sciences
Pages 791-799
Language en
Links dx.doi.org/10.1016/j.compgeo.2011.0...
Keywords GIS, Digital elevation model, Landslide, Susceptibiliy mapping, Rotational landslides
Subject categories Exogenous earth sciences, Physical Geography

Abstract

When performing landslide susceptibility mapping of rotational slides in fine grained soils, slope algorithms found in common GIS software have two major shortcomings. Firstly, these types of terrain algorithms only consider the slope angle at the surface. Secondly, the algorithm is local by its design i.e. it only considers neighbouring pixels. Due to the behaviour of a retrogressive rotational landslide, it would be more preferable to consider slope information as a predetermined cross-section angle from the base of the slope. This paper presents a new method using shadow casting algorithms for preliminary landslide susceptibility mapping in cohesive soils. A case study from western Sweden is also presented.

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