The present work aims to investigate the main characteristics of the evolution of the Sant’Andrea landslide, in the province of Belluno (Northern Italy). First, the modelling of the activation phase of the deforming mechanisms of the landslide has to be carefully analyzed, considering the predisposing and the triggering factors. Secondly, the simulation of the propagation phase becomes a fundamental task for the consequent risk analysis and management. Finally, the hydraulic behavior of the river in the site as a response to the possible propagation of the instable mass in the valley has also to be taken into account. To this aim, a collection of all the stratigraphic available data was firstly performed, reconstructing in detail the complex geological-hydrogeological model of the studied area. In particular, the localized information of the geological surveys were integrated with the results of the distributed geophysical investigations, so allowing for a 3-dimensional evaluation of the unstable slope. A complete geological model of the landslide area leaded to reliable study of the evolution of the landslide phenomenon through a propagation analysis. This was achived using a 3-D meshless numerical method able to simulate big soil displacements. Several factors must be taken into account to properly estimate the run-out distance and deposition heights. These characteristics are in fact strongly dependent from an appropriate choice of the rheological properties of the moving mass. The model chosen for the presented case was selected in accordance with the type of material composing the instable volume. This model was then included in the depth-integrated SPH model, adopted to simulate the hypothetic collapse of the mass in critical conditions. With the aim of analyzing the possible evolutions of the landslide, two scenarios were considered in the simulation of the mass propagation. Finally, in the last part of the present work, a new monitoring system is described. This innovative monitoring tool, based on the application of stereophotogrammetrical techniques on several images of the site, will ben installed soon to improve the landslide’s kinematics knowledge. This multidisciplinary work allowed a greater knowledge of the Sant’Andrea landslide, including the evaluation of its possible evolution, in order to better design possible solutions able to mitigate the hydrogeological risks that affect Perarolo city center.

Caratterizzazione geologica del versante e predisposizione di un modello geoidrologico previsionale per la valutazione del rischio connesso al fenomeno franoso di Sant'Andrea - Perarolo di Cadore (BL)

Carraro, Edoardo
2020/2021

Abstract

The present work aims to investigate the main characteristics of the evolution of the Sant’Andrea landslide, in the province of Belluno (Northern Italy). First, the modelling of the activation phase of the deforming mechanisms of the landslide has to be carefully analyzed, considering the predisposing and the triggering factors. Secondly, the simulation of the propagation phase becomes a fundamental task for the consequent risk analysis and management. Finally, the hydraulic behavior of the river in the site as a response to the possible propagation of the instable mass in the valley has also to be taken into account. To this aim, a collection of all the stratigraphic available data was firstly performed, reconstructing in detail the complex geological-hydrogeological model of the studied area. In particular, the localized information of the geological surveys were integrated with the results of the distributed geophysical investigations, so allowing for a 3-dimensional evaluation of the unstable slope. A complete geological model of the landslide area leaded to reliable study of the evolution of the landslide phenomenon through a propagation analysis. This was achived using a 3-D meshless numerical method able to simulate big soil displacements. Several factors must be taken into account to properly estimate the run-out distance and deposition heights. These characteristics are in fact strongly dependent from an appropriate choice of the rheological properties of the moving mass. The model chosen for the presented case was selected in accordance with the type of material composing the instable volume. This model was then included in the depth-integrated SPH model, adopted to simulate the hypothetic collapse of the mass in critical conditions. With the aim of analyzing the possible evolutions of the landslide, two scenarios were considered in the simulation of the mass propagation. Finally, in the last part of the present work, a new monitoring system is described. This innovative monitoring tool, based on the application of stereophotogrammetrical techniques on several images of the site, will ben installed soon to improve the landslide’s kinematics knowledge. This multidisciplinary work allowed a greater knowledge of the Sant’Andrea landslide, including the evaluation of its possible evolution, in order to better design possible solutions able to mitigate the hydrogeological risks that affect Perarolo city center.
2020-03-20
183
Frana - Gessi - Dissesto geo-idrologico
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.12608/21367