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The contribution of PSInSAR interferometry to landslide hazard in weak rock-dominated areas
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Orientador(es)
Resumo(s)
In the Grande da Pipa river basin, north of Lisbon, 64%
of the total number of landslides inventoried is totally or partially
included in a lithological unit composed by marl, clay, and sandstone
intercalation complex that is present in 58% of the study
area. The Persistent Scatterer synthetic aperture radar interferometry
technique is applied to a data set of TerraSAR-X SAR images,
from April of 2010 to March of 2011, firstly to the Laje-Salema test
site and further exported to the Grande da Pipa river basin. This
work’s specific objectives are the following: (i) to assess the potential
of the Persistent Scatterer displacement maps to the identification
of new landslides/unstable areas and in the redefinition
of landslide limits, (ii) to update the landslide state of activity, and
(iii) to evaluate the capacity of the Persistent Scatterer deformation
maps in assessing landslide susceptibility at the regional scale.
Based on this approach, it was possible to increment the number
of landslides and to redefine the landslide limits in the test site in
3.8%. For 39 landslides, it was possible to update the landslide state
of activity, in particular from dormant to reactivated or dormantreactivated
(23 landslides) or from stabilized to reactivated (5
landslides). Landslide susceptibility map based in Persistent
Scatterer deformation rates, independently validated with a deep
rotational slide map, obtained the best value of area under the
curve (0.668).
Descrição
Palavras-chave
PSInSAR TerraSAR-X Landslide hazard Weak rocks Grande da Pipa river basin
Contexto Educativo
Citação
Oliveira, S. C., Zêzere, J. L., Catalão, J. & Nico, G. (2015). The contribution of PSInSAR interferometry to landslide hazard in weak rock-dominated areas. Landslides, 12, 703–719. https://doi.org/10.1007/s10346-014-0522-9
Editora
Springer Verlag