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Landslide incidence in the North of Portugal: analysis of a historical landslide database based on press releases and technical reports
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Orientador(es)
Resumo(s)
This work presents and explores the Northern Portugal Landslide Database (NPLD) for the period 1900–2010.
NPLD was compiled from press releases (regional and local newspapers) and technical reports (reports by civil
protection authorities and academic works); it includes 628 landslides, corresponding to 5.7 landslides per
year on average. Although 50% of landslides occurred in the last 35 years of the series, the temporal distribution
of landslides does not show any regular increase with time. The relationship between annual precipitation and
landslide occurrence shows that reported landslides tend to be more frequent in wetter years. Moreover, landslides
occur mostly in the wettest months of the year (December, January and February), which reflects the importance
of rainfall in triggering slope instability. Most landslides cause damage that affects people and/or
structures; 69.4% of the landslides in Northern Portugal caused 136 fatalities, 173 injured and left 460 persons
homeless. More than half of the total landslides (321 landslides) led to railway or motorway closures and 49
landslides destroyed 126 buildings.
The NPLD is comparedwith a landslide database for thewhole of Portugal constructed froma single daily national
newspaper covering the samereference period. Itwill be demonstrated that the regional and local newspapers
are more effective than the national newspaper in reporting damaging landslides in the North of Portugal. Like
other documentary-based landslide inventories, the NPLD does not accurately report non-damaging landslides.
Therefore, NPLD was found unsuitable to validate municipal-scale landslide susceptibility models derived from
detailed geomorphology-based landslide inventories.
Descrição
Palavras-chave
Landslides Historical inventory Landslide damage Database reliability North of Portugal
Contexto Educativo
Citação
Pereira, Susana da S., Zêzere, José, Quaresma, Ivânia Daniela & Bateira, Carlos. (2014). Landslide incidence in the North of Portugal: Analysis of a historical landslide database based on press releases and technical reports. Geomorphology, 214, 514-525. https://doi.org/10.1016/j.geomorph.2014.02.032. ISSN: 0169-555X
Editora
Elsevier