Agliardi, F.

Arlati, F.

Castellanza, R.

Cevasco, A.

Crosta, G. B.

Frattini, P.

Margottini, C.

Moody, W.

Spizzichino, D.

Tettoni, A.

Valagussa, A.

Valbuzzi, E.

English

Frattini P.

Moody W.

Tettoni A.

Arlati F.

Agliardi F.

Castellanza R.

Cevasco A.

Valbuzzi E.

Valagussa A.

Margottini C.

Spizzichino D.

Crosta G. B.

Archivio istituzionale della ricerca - Università di Genova

Geophysical Research AbstractsVol. 20, EGU2018-18228, 2018EGU General Assembly 2018© Author(s) 2018. CC Attribution 4.0 license.Rockfall and deep-seated rockslide modelling in the Cinque TerreUNESCO World Heritage sitePaolo Frattini (1), Will Moody (2), Andrea Tettoni (1), Federico Arlati (1), Federico Agliardi (1), RiccardoCastellanza (1), Andrea Cevasco (3), Elena Valbuzzi (1), Andrea Valagussa (1), Claudio Margottini (4), DanieleSpizzichino (4), and Giovanni B Crosta (1)(1) Universita’ degli Studi di Milano - Bicocca, Earth and Environmental Sciences, Milano, Italy (paolo.frattini@unimib.it),(2) University of Portsmouth, School of Earth and Environmental Sciences, Portsmouth, United Kingdom, (3) University ofGenova, Dipartimento di Scienze della Terra dell’Ambiente e della Vita, Genova, Italy, (4) ISPRA - Institute forEnvironmental Protection and Research, Roma, ItalyThe Ligurian coast between Cinque Terre and Portovenere is a UNESCO cultural landscape site. Human settlementin this region over the past millennium have been developed by shaping a steep, uneven terrain, which is highlyprone to landsliding. Rockfalls, shallow landslides, debris flows and deep-seated landslides have seriously affectedthe site during the last centuries, with serious damages and injuries to population. This site has been selectedas a case study for the PROTHEGO (PROTection of European Cultural HEritage from GeO-hazards) researchproject. Two main processes have been analysed within the project: rockfalls along the well-known Via dell’Amore(Lover’s Lane), a 500 m long portion of the Cinque Terre coastal path between Manarola and Riomaggiore; and adeep-seated rockslide at Punta Persico, south of Campiglia. Since its construction in the 1920’s, the Via dell’Amoreplayed an important role in the local history and more recently as a popular hotspot for tourists visiting the region.The walkway has been closed since 2012 when a rockfall severely injured 4 tourists on the path causing thelocal authorities to close the walkway since this event. Hazard and risk assessment along the closed portion ofthe path have been performed. Terrestrial Laser Scanning (TLS) was used to image the inaccessible rock facesand slopes, in order to characterize the discontinuities and perform kinematic feasibility analyses. The resultingsusceptibility values were used, along with other inputs (i.e. DEM, block sizes, coefficients of restitution), to runrockfall simulations by 3D numerical modelling software Hy-Stone. The simulation results were used to attain ahazard zonation along the walkway. The individual risk of being killed by a rockfall while on the path on any givenday is about one in every 200.000 people. The Punta Persico deep-seated landslide involves many houses insidethe landslide, which can be subdivided in several sectors with different behavior. The landslide appears to be activefrom Ps-InSAR data available from the Italian Special Plan of Remote Sensing of the Environment (Costantini etal, 2017), with surface displacement rates in the order of 10 to 20 mm/a during the period 1992-2008. Followingfield activity, geomechanical survey, and photo-interpretation, a geological and geotechnical model of the landslidewere developed, to be used as a basis for the construction of a 3D Finite Element model of the slope with GTS-NX.The simulation has been calibrated by fitting the observed PS-InSAR displacement rates, in order to constrain thelandslide behavior and to trace the potential evolution of the phenomenon. The results show that the landslide isslowly deforming through time without serious treats for the buildings and the population.

Rockfall and deep-seated rockslide modelling in the Cinque Terre UNESCO World Heritage site

https://iris.unige.it/bitstream/11567/928815/2/EGU2018-18228.pdf

Rockfall and deep-seated rockslide modelling in the Cinque Terre UNESCO World Heritage site

Abstract

Similar works

Full text

Available Versions

Archivio istituzionale della ricerca - Università di Genova