A carregar...
Publicação
Susceptibility assessment to different types of landslides in the coastal cliffs of Lourinhã (Central Portugal)
| Nome: | Descrição: | Tamanho: | Formato: | |
|---|---|---|---|---|
| 2.26 MB | Adobe PDF |
Orientador(es)
Resumo(s)
The coastal zone of Lourinhã (located in Central Portugal) is characterized by beach–cliff systems,where beaches
are narrowand cliffs have notorious slope instability. These cliffs evolve by different types of landslides,which are
one of the main sources of natural hazard and risk in this coastal region.
In this work, aerial photo interpretation and a systematic field survey were performed in order to obtain an
inventory of landslides of the following types: rotational slides, translational slides and debris flows. The entire
coast was then split into 261 terrain mapping units. For each unit, landslide predisposing factors were derived
and classified: cliff elevation, slope angle (maximum, mean and standard deviation), potential solar radiation,
slope curvature (profile and plan), lithological units and geologic structure. The predictive susceptibility models
were computed for each type of landslide using a bi-variate statisticalmethod — the Information ValueMethod.
The degree of fit and the predictive capacity of the models were assessed using the Effectiveness Ratio, the
standard Receiver Operator Characteristic curves and the respective Area Under Curve.
Results showthat each landslide typology occurs in particular terrain conditions. Individual susceptibilitymodels
evidence better predictive capacity than susceptibility model for total landslides.
Descrição
Palavras-chave
Coastal Cliffs Landslides Susceptibility Information Value Portuguese Western Coast
Contexto Educativo
Citação
Epifânio, Bruno, Zêzere, José & Neves, Mário. (2014). Susceptibility assessment to different types of landslides in the coastal cliffs of Lourinhã (Central Portugal). Journal of Sea Research, 93, 150-159. https://doi.org/10.1016/j.seares.2014.04.006
Editora
Elsevier