Predicting Debris Flow Susceptible Areas
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 aims to present the results of a GIS modelling to predict debris flow
susceptible areas in the Aparados da Serra region (Brazil). The region shows a
1000 m high scarp located close to Atlantic Ocean in southern Brazil. The scarp
is developed upon sandstones (Botucatu Fm.) and basalts and dacites (Serra
Geral Fm.) of the Paraná Basin, after the break-up of the Gondwana
Supercontinent and the opening of the South Atlantic Ocean. It is a topographic
barrier to convective clouds migrating from ocean to the continent, mainly in
spring and summer seasons. Geologic, geomorphologic, geotechnical mapping
were conducted in order to enable GIS data modelling for debris flow in the
region. The prediction of areas susceptible to debris flow along the scarp was
based upon USPED algorithms. However, some changes were introduced into
USPED algorithms in order to model debris flows in this region. The GIS
modelling results distinguished susceptible areas for erosion and deposition of
the debris, according the modified USPED procedures. These results were
compared with a large debris flow event occurred in December 1995, and also
recent small scale and localized debris flow events. All these observed debris
flows show good correlation with predicted area of occurrence. Thus, it can be
concluded that such GIS modelling can be applied to predict areas susceptible
for erosion and deposition of debris related to concentrated convective storms.
Keywords: debris flows susceptibility map, GIS modelling, USPED, erosion and
deposition.
Keywords
debris flows susceptibility map, GIS modelling, USPED, erosion anddeposition.
Related Book
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