eorlEvaluation of Rainfall-Induced Landslides triggering using a multidisciplinary approachIvo
In a large part of South America, slow landslides are triggered by extreme hydrometeorological conditions leading to, for instance, Rainfall-Induced Landslides – RILs. These RILs are common in urban areas and have a negative impact on the population and infrastructure development. Despite their...
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| Formato: | article |
| Lenguaje: | EN ES |
| Publicado: |
Pontificia Universidad Javeriana
2020
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/796beb0e918d49faa670982a712194c3 |
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| Sumario: | In a large part of South America, slow landslides are triggered by extreme
hydrometeorological conditions leading to, for instance, Rainfall-Induced
Landslides – RILs. These RILs are common in urban areas and have a negative
impact on the population and infrastructure development. Despite their
importance, these events are little understood. We aimed at understanding
the spatial distribution of RILs in the urban zone of Temuco, Chile (38.8°S,
72.6°W). The area has the typical hydrometeorological conditions of southern
Chile. We conducted our assessment with a temporal analysis of shallow
deformations, obtained by synthetic aperture radar interferometry (Sentinel
1 A/B). These shallow deformation rates were compared with satellite
precipitation data (CHIRPS product) and electrical resistivity tomography
(ERT). We identified active RIL-prone zones with deformation rates greater
than 60 mm during the period 2014 to 2017, supporting theories of
hydrometeorological control. Slow movements were observed in volcanic
soils, suggesting the influence of their geotechnical characteristics. Our results
can be extrapolated to the southern Andes (35°S-43°S), where a large number
of volcanic-sedimentary units are susceptible to RILs. Finally, integration of
our multidisciplinary approach will facilitate understanding of the local RIL
dynamics, allowing a better risk management to decision-makers in South
American and other developing countries. |
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