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Publicação
Análise da evolução da ocupação e uso do solo no Concelho de Angra do Heroismo. Influência nos movimentos de terreno e de vertente
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Resumo(s)
This master dissertation aims to study mass movements dynamics and its classification, as well as the identification of the factors that control and initiate them. These concepts and knowledge were applied to the district of Angra do Heroísmo in Terceira´s island of the Azores in order to elaborate a map where the areas showing susceptibility to mass movements were identified. This identification and mapping of mass movements is a contribution to the planning and management of the municipality territory, where the natural conditions are favorable to the geomorphic instability. The misadjusted human actions in this vulnerable region can improve the landscape instability.
There are several causes for the mass movements starting. Usually, the beginning of a mass movement is attributed to a single factor, as for instance an unusual precipitation, however this does not correspond to the reality, as a complex number of factors are involved. It was given highlight in this study to the human action as a trigger factor, that in a perspective of sustainable management and development, allow to understand how devastation and significant can be his action.
In a perspective of identifying the impact of human actions in the mass movements, as well as the characterization of the geomorphic susceptibility of the area in study, the maximum infiltration areas were delimitated. The maximum infiltration areas are one of the most important territory management figures to preserve, and several times have misadjusted human occupation. In order to delimitate these areas, as well as to elaborate the mass movements susceptibility map for the district of Angra do Heroísmo, several physical characteristics of the region were analysed: geology/lithology, volcanic activity and seismicity, geomorphology, soils, etc. The Permeability of the geologic formations and the soils was also evaluated.
Intervention actions for the area were recommended to implement in the most instable areas, in order to promote its protection, conservation or recuperation. These measures are considered crucial to maintain the balance of the Landscape, and prevent the occurrence of possible catastrophic events.
Descrição
Mestrado em Arquitectura Paisagista - Instituto Superior de Agronomia
Palavras-chave
Angra do Heroismo acção antrópica áreas de máxima infiltração movimentos de terreno susceptibilidade geomorfológica human action maximum infiltration areas mass movements geomorphologic susceptibility