LANDSLIDE SUSCEPTIBILITY MAPS IN THE ROCK SLOPES OF THE VENTOTENE ISLAND (LATIUM, ITALY)
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1 LANDSLIDE SUSCEPTIBILITY MAPS IN THE ROCK SLOPES OF THE VENTOTENE ISLAND (LATIUM, ITALY) I. Caso 1, R. D Angelo 1, B. Palma 1, M. Parise 2, A. Ruocco 1 1 IdroGeo srl, Vico Equense, Italy 2 National Research Council, Institute of Research for the Hydrogeological Protection, Bari, Italy
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5 Cliffs from 130 m (southern sector) to 10 m (northern sector) high
6 Evidence of instability along the coasts Open cracks Open cracks
7 Extensive cracks along a cliff Landslide deposits at the base of a cliff Landslide crown
8 Cala Rossano, 20 April 2010
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10 Cala Rossano, 20 April 2010 before (photo: Technical Office of Ventotene Municipality) after
11 Key to legend: 1) Loose aeolian deposits, consisting of reworked pyroclastic materials; 2) Tuff; 3) Loose and weakly welded pyroclastic deposits, locally turning in soil; 4) Lava flows ( years).
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13 Natural and man-made caves
14 Matheson test (1983) Four failure mechanisms: Wedge failure Block toppling Planar sliding Flexural toppling Matheson G.D., Rock stability assessment in preliminary investigations. Graphical methods. Dept. Environ., Transport and Road Res. Lab. Rep
15 Ancient underground aqueduct
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17 Parata Grande landslide
18 Planar sliding K1 K2 K3 area (m , , )/% , Flexural toppling K1 K2 K3 area (m , 3.49 )/% ,5 3, Wedge failure K1, K2 K1, K3 K2, K3 area (m , , , )/% Block toppling S b, K1, K2 S b, K1, K3 S b, K2, K3 area (m 2 )/% 0 0, ,1 0 0,0 Surfaces affected by instabilities in the Ventotene Island.
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21 Wedge failure Toppling Legend curve_dwg Polyline PUNTA EOLO Legend blo_sb_k2_k3 sciv_s_k3 0 sciv_s_k2 0 sciv_s_k1 0 sciv_k2_k3 CALA ROSSANO 0 1 blo_sb_k1_k3 0 blo_sb_k1_k2 PUNTA EOLO 0 1 PARATA GRANDE PORTO ROMANO 0 CALA ROSSANO sciv_k1_k3 0 1 CALA NAVE 1 blo_k3b_k1_k2 PARATA GRANDE PORTO ROMANO 0 blo_k2b_k1_k3 CALA NAVE 0 blo_k1b_k2_k3 CALA BATTAGLIA 0 curve_dwg Polyline CALA BATTAGLIA PARATA DELLA POSTINA PARATA DELLA POSTINA NTA DELL'ARCO SALIERE NTA DELL'ARCO SALIERE Meters , Meters
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23 Susceptibility map of the Basin Authority (2013 update) Advantages: - Automated and rapid method to evaluate landslide susceptibility - The possibility to identify the mechanism of failure provide important insights for the design of stabilization works - Rather than delimiting areas with a number of constraints and rules, the point above allows to develop engineering works, that necessarily must be based upon the results of the susceptibility evaluation - Methodology based on site analysis, but that can be easily managed at smaller scale, for preliminary assessment of the susceptibility to landslides Crucial points: - Presence of caves, and their effect on instability, cannot be neglected - In situ measurements remain necessary; they can be performed in sample areas, but in any case cannot be entirely substituted by remote sensing analyses
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