1,720,979 research outputs found
Geomorphological investigation and management of the Guvano complex landslide (Cinque Terre National Park, Italy)
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The Lovers’ Lane (Via dell’Amore) rockfall events: a history of dangerous collapses
No full textThis research describes rockfall events affecting the so called “Lovers Lane”, a path that runs
along the Cinque Terre rocky coastline. Realized at the beginning of ‘20s century as a service road during the
construction of the railway, starting from the ‘60s has become the most visited trail of the Cinque Terre National
Park, being used by over 2 million tourists per year. The path runs along the bottom of a steep rocky cliff and
is historically subject to rock collapses, which led to its frequent closure over the years. Cases of injuries in the
last 25 years have been registered in 1990, 1991, 1994, 1996, 2000, 2006 and 2010; the last of these accidents
occurred on September 24th, 2012 causing the injury of Australian tourists and the subsequent closure of the
trail until now
An underground historical quarry in the Hanbury Botanical Gardens of Ventimiglia (Italy)
No full textThis paper concerns with the original survey of an ancient underground quarry located in the internationally known Hanbury botanical gardens, located on the Mortola promontory, 2 kilometers far from the Italy - France boundary.
The gardens were established from 1867 by Sir Thomas Hanbury with the aim of acclimatizing several rare botanical species coming from all the temperate climate regions of the world. Many restoration works have been executed, and to this end an extended sandy layer located on the upper portion of the property was used as building material: it was extracted from weakly cemented yellowish sands probably belonging to the top of the Pliocenic Ortovero clay formation.
The artificial cave opens up to about 90 m a.s.l. and has a total length of 133 m and a maximum difference in level of 8 m; the total volume extracted is of the order of 1,500 m3 and the internal stability seems guaranteed by some stone pillars.
The NE portion of the underground quarry has not been surveyed yet because of the cavity infilling: some testimonies from inhabitants report a possible continuation under the village of Mortola Inferiore.
The sand quarry of the Hanbury Botanical Gardens is therefore a cultural heritage with a high tourist potential, even if the site requires further analyses about the geotechnical features of the material aiming at assessing the stability of the underground volume
Extreme Flood and Landslides Triggered in the Arroscia Valley (Liguria Region, Northwestern Italy) During the November 2016 Rainfall Event
No full textFrom November 20th, 2016, to November 25th, 2016, Liguria Region (northwestern Italy) experienced prolonged and intense rainfall. The rainfall sequence occurred following two main phases. The second phase mainly hit the western sector of the region, reaching its peak on November 24th. Rainfall was particularly abundant within the Arroscia valley, where the 5–days cumulative rainfall locally exceeded 50% of the mean annual precipitation. In this paper, we document the rainstorm magnitude, presenting a first inventory of the rainfall–induced ground effects within the Arroscia Valley. The mapping was performed by means of extensive field work that was partly supported by satellite imageries. More than 250 landslides affected the upper sector of the valley, while in the downstream reach, widespread flood-related forms and processes resulting from the abundant precipitation were mapped. The results of this study are expected to be helpful for future research on both landslide– and flood–related channel change susceptibility and risk scenarios evaluation
Performance Evaluation of Cryptographic Schemes for Blockchain Security of Smart Grids
No full textBlockchain technology can be applied to smart
grids to support business and management operations, and
its distributed nature is advantageous when considering usermanaged renewable systems. However, these new fully distributed
systems raise a number of security and privacy issues. For this
reason, numerous solutions integrating blockchain with privacy
and security enhancing technologies, such as homomorphic encryption, secret sharing and zero-knowledge proof, have been
proposed in the literature. The complexity of such systems from
an algorithmic and protocol point of view is obvious, while the
computational cost is less obvious and often overlooked by the
authors. In this paper, we want to experimentally evaluate the
computational weight of cryptographic techniques proposed to
guarantee security and privacy on blockchains. We will take
as reference commercial devices with computational capabilities
similar to those we expect to find in smart grid devices. The
results show that some techniques are not suitable for these
scenarios and that architectural solutions must therefore be
carefully designed
The 10th November 2014 flash-flood event in Chiavari city (Eastern Liguria, Italy)
No full textDue to short durations of heavy rainfalls that occurred between November 10th and 11th, 2014 the Chiavari area was the subject of a serious geo-hydrological event determined by the simultaneous overflowing of the Entella and Rupinaro streams.
In the lower Fontanabuona valley (Municipality of Leivi) a landslide destroyed a building and took the lives of two people, while severe damages to buildings and infrastructures were recorded in the Chiavari historical center, Carasco and Cogorno.
Between 08:00 am on November 10th and 08:00 am on November 11th 2014, peaks of rainfall peaks in Entella stream catchment order of 60 mm/1h and cumulated rainfall of 220 mm/24h were recorded. The levels of streams were immediately elevated, highlighting a concentrated time of less than 1 hour between 08:00 pm and 00:00 am when the level of the Entella stream moved up to 7 m leading to the flooding in Carasco, Cogorno, and in Chiavari (the Caperana district). Meanwhile flash flooding in the Rupinaro stream resulted in water levels up to 1.5 m in the old town of Chiavari
The Guvano complex landslide in the Cinque Terre National Park, Italy: Geomorphological characterization, GNSS monitoring and risk management
No full textThe “Guvano landslide” is located along the steep coastal slopes of Cinque Terre between the
villages of Vernazza and Corniglia (Eastern Liguria, NW Italy). It is an ancient and complex mass movement
that has been affected by several reactivation phenomena in hystorical and recent time. Nowadays the Guvano
landslides is partly dormant and partly still active, also due to the sea wave action at the slope toe. In the last
century geomorphological processes of remobilisation along different sector of the landslide area caused severe
damages to settlements, railway and roads, also involving currently the highly frequented trail network of Cinque
Terre National Park. In order to contribute to landslide risk management by the identification of proper mitigation
measures, the geomorphological characterization and the recent evolution of Guvano landslide, supported by
geotechnical investigations and a GNSS monitoring program, are presented
Quantitative landslide susceptibility assessment of the Vernazza catchment (Cinque Terre National Park, Italy)
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