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Hazard assessment in Galé - Olhos de Água sea cliffs: a tool for coastal management
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Orientador(es)
Resumo(s)
Coastal hazards are a function of the interaction between human activities and naturally
induced coastal processes. The conflicts arising from this interaction require new approaches
that integrate the complex geodynamic environment of rocky coasts. Aiming to develop a
method for assessing hazard in sea cliffs suitable for coastal management, the research
presented combines the assessment of sea cliff evolution forcing mechanisms along with
protection factors. The method considers wave exposure, mass movements and cliff face
lithology and profile as factors of increased susceptibility to erosion in sea cliffs, while the
presence of beaches and shore platforms protects cliffs from erosion. The method combines
digital photogrammetry techniques and GIS analysis, based on a weighted factors approach,
attributing weights according to different classes within each factor, in order to obtain a final
hazard index that aggregates all factors. The method was applied to the rocky sea cliffs
between Galé and Olhos de Água (Algarve, Portugal). High and very high hazard are
dominant along the study area, representing more than 90% of the coastline studied. They
occur predominantly in the absence of protective beaches and shore platforms. Moderate and
low hazard have reduced expression but, even where they have been reported, hazard is not
inexistent. The method presents cliff erosion hazards along the study area, being a suitable
tool for cliff hazard assessment and useful for coastal management.
Descrição
Dissertação de mest., Gestão da Água e da Costa, Univ. do Algarve, 2007
Palavras-chave
Teses Zonas costeiras Riscos Rochas Gestão costeira GIS Portugal