Because of erosion problems in the foundation wall of Rio Nuovo, probably caused by the ferry boat traffic, some collapse phenomena were observed on the surface of the embankment . A diagonal fracture in the asphalt surface interested a corner of the ferry boat station showing a collapse of about 15 cm. The interest was to understand the geometry of the collapsing structure, the depth limit of the event, the possible relationships with the morphology of the channel bottom and the identification of other hazard areas in west and east embankments .


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