Susceptibilidade às cheias na área metropolitana de Lisboa norte. Factores de predisposição e impactes das mudanças de uso do solo
DOI:
https://doi.org/10.18055/Finis3129Abstract
Neste trabalho foram analisadas e comparadas doze bacias hidrográficas do sector norte da Área Metropolitana de Lisboa (AML), com um histórico de cheias que têm provocado, recorrentemente, vítimas mortais e outras consequências danosas. a metodologia de análise baseou ‑se no cálculo de indicadores quantitativos referentes aos factores de predisposição (naturais) às cheias (geometria das bacias, substrato geológico, relevo e rede de drenagem) e a factores antrópicos (neste caso, uso do solo e sua evolução), a partir dos quais foram desenvolvidos índices de susceptibilidade às cheias, através da utilização de sistemas de informação Geográfica. Os resultados deste estudo permitiram detectar: (i) as bacias de maior susceptibilidade às cheias; (ii) os factores condicionantes para a formação de cheias em cada uma das bacias; (iii) os impactes das modificações do uso do solo nos tempos de concentração e nos caudais de ponta, que aumentam a velocidade de progressão e magnitude das cheias, potenciando a sua perigosidade; (iv) o aumento generalizado da construção nas Zonas afectadas por Cheias (ZAC), que incrementa a exposição e o risco de cheia na AML
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