Cassana is placed in the Magra River Valley (Tuscany, Italy). A large and slow complex landslide involves the ancient village and causes severe damage and high risk. Many investigations were performed, aiming at gathering data and information and developing methodologies, in order to realize countermeasures and mitigate the risk. Geological and geomorphological investigations, subsurface exploration (core drillings, seismic refraction survey), geotechnical analysis, deformation and piezometer monitoring were carried out. Moreover, chemical and isotopic analyses on the underground waters were performed, aiming at identifying their intake areas and underground ways in the landslide bodies close to the village. The geochemical and isotopic investigations gave a meaningful contribution in reconstructing a geometric, kinematic and hydrogeological model of the Cassana landslide. This allowed the elaboration of a hypothetical outline of the underground water circulation and the individuation of some intake areas and preferential ways of the underground waters, greatly influencing the landslide and village instability. In conclusion, the geochemical and isotopic approach to the slope instability represents a possible and innovatory application of the chemical-isotopic technique in investigating the landslide causes.
Approccio multidisciplinare per la valutazione della pericolosità di frana: indagini geologico-tecniche, idrogeologiche, geochimiche e isotopiche per la determinazione degli apporti idrici sotterranei nella frana di Cassana in Val di Magra (Massa-Carrara, Italia)
D'AMATO AVANZI, GIACOMO ALFREDO;PUCCINELLI, ALBERTO
2006-01-01
Abstract
Cassana is placed in the Magra River Valley (Tuscany, Italy). A large and slow complex landslide involves the ancient village and causes severe damage and high risk. Many investigations were performed, aiming at gathering data and information and developing methodologies, in order to realize countermeasures and mitigate the risk. Geological and geomorphological investigations, subsurface exploration (core drillings, seismic refraction survey), geotechnical analysis, deformation and piezometer monitoring were carried out. Moreover, chemical and isotopic analyses on the underground waters were performed, aiming at identifying their intake areas and underground ways in the landslide bodies close to the village. The geochemical and isotopic investigations gave a meaningful contribution in reconstructing a geometric, kinematic and hydrogeological model of the Cassana landslide. This allowed the elaboration of a hypothetical outline of the underground water circulation and the individuation of some intake areas and preferential ways of the underground waters, greatly influencing the landslide and village instability. In conclusion, the geochemical and isotopic approach to the slope instability represents a possible and innovatory application of the chemical-isotopic technique in investigating the landslide causes.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
