Relação entre movimentos de vertente e a morfo-estrutura na bacia hidrográfica da Tornada (sector Centro-Oeste de Portugal)
C. Henriques (1) , M. Cardinali (2), P. Reichenbach (2), M. Santangelo (2), F. Guzzetti (2), J. L. Zêzere (1) , 2010, Relação entre movimentos de vertente e a morfo-estrutura na bacia hidrográfica da Tornada (sector Centro-Oeste de Portugal) ,
V Congresso Nacional de Geomorfologia, Porto, 8-11 Dicembre 2010,
URL: http://www.cnr.it/prodotto/i/273193
This paper presents the relationships between the geological and structural settings and the distribution of slope movements in the Tornada river basin (107 km2 ), in Central western Portugal. This basin was chosen for its geological and tectonic features and for the abundance of slope movements. The study area is situated in a dissected old quaternary coastal plateau with an evident syncline structure, where crop out mainly upper Jurassic sandstones and claystones. A detailed structural-geological map at 1_10 000 scale and a detailed landslide inventory map were prepared through the interpretation of stereoscopic aerial photographs and extensive field surveys. The landslides were classified according to the type of movement into shallow and deep-seated failures (mainly translational), and the relative age into recent and old. The distribution of the landslides and their relationship with lithology and bedding attitude were studied considering in particular: i) the presence of weak lithological layers; ii) the attitude of planar and continuous bedding planes dipping towards the free-face of slope; iii) the presence of hydrogeological conditions favorable to slope instability; and iv) the occurrence of normal faults. The relationship between structural settings, geological information and landslides was studied in order to understand the factors that mainly explain the instability conditions of the area.
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