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Autores
Costa, Nuno Marques da,1960-
Orientador(es)
Resumo(s)
Os episódios de precipitação intensa ocorridos durante os meses de Inverno encontramse
associados ao desencadear de movimentos de vertente, causando muitas vezes a
obstrução das redes viárias, a destruição de edifícios e em certos casos até à perca de
vidas. Através da avaliação da susceptibilidade e do recurso à análise geomorfológica
da Área Metropolitana de Lisboa (AML) pretende-se identificar as áreas sensíveis à
ocorrência de movimentos de vertente, contribuindo assim para uma melhor gestão do
território, diminuindo desta forma o grau de exposição que o caracteriza. Recorrendo
aos Sistemas de Informação Geográfica (SIG), constitui objectivo inicial deste trabalho,
criar um inventário de movimentos de vertente baseado em foto-interpretação,
construindo em seguida um modelo de avaliação da susceptibilidade da AML.
O método estatístico utilizado foi o Valor Informativo (VI), método indirecto bivariado,
que utiliza diversos factores de predisposição. Posteriormente foi feita a validação do
modelo, o que permitiu aferir a sua qualidade e robustez e foi testada a sua capacidade
preditiva. Constitui objectivo final deste trabalho criar um modelo de Risco da rede
ferroviária da AML à ocorrência de movimentos de vertente, a partir do qual serão
calculados os Custos Directos e Indirectos resultantes, para a totalidade da rede
ferroviária, bem como para cada uma das linhas suburbanas da AML. A construção
destes modelos tem por base o estipulado no “Guia Metodológico para a Produção de
Cartografia Municipal de Risco e para a Criação de Informação Geográfica de Base
Municipal” (2009).
ABSTRACT: The episodes of intense precipitation that occur during the winter months are associated with the triggering of landslides, often causing obstruction of road networks, the destruction of buildings and in some cases even the loss of lives. By assessing the susceptibility and the use of geomorphological analysis of the Lisbon Metropolitan Area (LMA) it is intended to identify the areas sensitive to the occurrence of landslides, thus contributing to a more accurate planning, and thereby decreasing the degree of exposition within the study area. The use of Geographic Information Systems (GIS) provides the initial objective for this work, allowing the creation of an inventory of landslides based on photo-interpretation, followed then by the buildup of a model to evaluate the landslide susceptibility in the LMA. The statistical method used was the information value (IV), a bivariate statistic indirect method, which uses several landslide predisposing factors. Later this inventory was used to validate the model, thus allowing the assessment of model quality and robustness as well as constituting a test to its predictive capacity. An ultimate objective of this work is the creation of a risk model for the LMA, from which it was, calculated the risk of occurrence of landslides for the railway network within the LMA, and the direct and indirect costs accruing to the entire rail network, as well as for each of the suburban lines within the LMA. The construction of these models is based on the stipulations of the "Methodological Guide for the Production of Municipal Mapping and Risk for Developing Geographic Information Base City" (2009).
ABSTRACT: The episodes of intense precipitation that occur during the winter months are associated with the triggering of landslides, often causing obstruction of road networks, the destruction of buildings and in some cases even the loss of lives. By assessing the susceptibility and the use of geomorphological analysis of the Lisbon Metropolitan Area (LMA) it is intended to identify the areas sensitive to the occurrence of landslides, thus contributing to a more accurate planning, and thereby decreasing the degree of exposition within the study area. The use of Geographic Information Systems (GIS) provides the initial objective for this work, allowing the creation of an inventory of landslides based on photo-interpretation, followed then by the buildup of a model to evaluate the landslide susceptibility in the LMA. The statistical method used was the information value (IV), a bivariate statistic indirect method, which uses several landslide predisposing factors. Later this inventory was used to validate the model, thus allowing the assessment of model quality and robustness as well as constituting a test to its predictive capacity. An ultimate objective of this work is the creation of a risk model for the LMA, from which it was, calculated the risk of occurrence of landslides for the railway network within the LMA, and the direct and indirect costs accruing to the entire rail network, as well as for each of the suburban lines within the LMA. The construction of these models is based on the stipulations of the "Methodological Guide for the Production of Municipal Mapping and Risk for Developing Geographic Information Base City" (2009).
Descrição
Tese de mestrado, Geografia - Sistemas de Informação Geográfica e Modelação Territorial Aplicados ao Ordenamento, Universidade de Lisboa, Instituto de Geografia e Ordenamento do Território, 2011
Palavras-chave
Deslizamentos de terras - Área Metropolitana de Lisboa (Portugal) Caminhos de ferro - Área Metropolitana de Lisboa (Portugal) Avaliação de riscos ambientais Sistemas de informação geográfica Teses de mestrado - 2011
