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Advisor(s)
Abstract(s)
A landslide quantitative risk analysis is applied the municipality of Santa
Marta de Penagui~ao (N of Portugal) to evaluate the risk to which the
buildings are exposed, using a vector data model in GIS.
Two landslide subgroups were considered: landslide subgroup 1 (event
inventory of landslides occurred on January 200)1; and landslide subgroup
2 (inventoried landslides occurred after the 2001 event until 2010). Seven
landslide predisposing factors were weighted and integrated using the
Information Value Method. The landslide susceptibility model was
independently validated and the model performance was expressed by
ROC curves.
The probability of landslide size was estimated using a probability density
function and the landslide hazard scenario was defined using the same
landslide rainfall-triggering event.
A vulnerability curve was constructed for each type of building considering
its structural properties and the proxy of landslide magnitude. The
economic value assigned for each building represents an approximated
cadastral value.
The landslide risk was computed for each building in vector format based
on a rainfall triggering scenario and two landslide magnitudes.
The probability of occurrence of small landslides is two orders of magnitude
higher than the probability of occurrence for large landslides, which
explains the higher risk generated by small landslides, despite of registering.
Description
Keywords
Susceptibility Hazard scenario Shallow slides Vulnerability Landslide risk
Pedagogical Context
Citation
Pereira, Susana da Silva, Garcia, Ricardo A. C., Zêzere, José, Oliveira, Sérgio, & Silva, Márcio. (2017). Landslide quantitative risk analysis of buildings at the municipal scale based on a rainfall triggering scenario. Geomatics, Natural Hazards and Risk, 8(2), 624–648. https://doi.org/10.1080/19475705.2016.1250116
Publisher
Taylor & Francis