Predicting Favourable Areas For
Landsliding Through GIS Modelling In
Aparados Da Serra (Brazil)
Author(s)
A. J. Strieder, S. A. Buffon, T. F. P. de Quadros
& H. R. Oliveira
Abstract
This paper presents the results of GIS modelling for predicting areas where
natural landslides can occur in the Aparados da Serra region (Southern Brazil).
The scarp is mainly developed upon basalts and dacites (Serra Geral Fm.) and
sandstones (Botucatu Fm.) of the Paraná Basin. The 1000 m high scarp has been
geomorphologically evolving since the break-up of the Gondwana
Supercontinent and the opening of the South Atlantic Ocean. Geologic,
geomorphologic and geotechnical mapping were conducted in order to acquire
field data and to define a conceptual geomorphologic-geotechnical model for
GIS data modelling. These mappings were aided with ASTER image processing
and aerial photograph analysis. ASTER images do permit a high resolution and
accurate DEM. The prediction of areas able to develop natural landslides along
the scarp was based upon Factor of Safety (FS) algorithms. The GIS modelling
results for Aparados da Serra region were grouped into four categories. The areas
with the lowermost FS number were defined as highly susceptible to developing
natural landslides. Field investigations upon some existing landslide structures in
the region do confirm such predictions. However, large scale FS determination
through GIS modelling in order to predict susceptible areas for landslides must
be interpreted in a relative manner. FS modelling can, then, be applied to
landslide susceptibility mapping in areas of poor historical records, since
supported by adequate geological and geotechnical investigations.
Keywords: landslides, susceptibility maps, GIS modelling, factor of safety.
Keywords
landslides, susceptibility maps, GIS modelling, factor of safety.
Related Book
Other papers in this volume
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