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Colate detritiche durante gli eventi alluvionali del 13 ottobre 2014 in provincia di Parma e 13-14 settembre 2015 in provincia di Piacenza
No full textDebris flows in Val Nure and Val Trebbia (N Apennines) during the September 2015 alluvial event in Piacenza Province (Italy)
No full textDuring September 2015, some municipalities of Val Nure and Val Trebbia areas (Piacenza province) have been affected by a severe rainstorm event which has caused flooding along rivers and debris flows and landslides on slopes. A toll of 3 casualties and serious damages to infrastructures and roads was paid. In the mostly affected areas, rainfall in 6 hours reached 298 mm with an hourly precipitation peak of 107,6 mm/h. In an area of approximately 500 km2, 103 debris flow have occurred. The distribution of debris flows seems to be controlled by the distribution of the intensity of the rainstorm. Debris flows seems to have in many cases caused by slope failures in the upper part of the sub-basins. These phenomena remobilized slope debris that, subsequently, was transported by channelized debris flows. Major damages were suffered at locations where roads are crossing the creeks and streams along which the debris flow occurred. A preliminary analysis of affected sub-basins in one of the areas mostly affected by debris flows, indicates that a straightforward discrimination of the susceptibility of sub-basins based on simple morphometric and lithologic factors is not possible
Slope dynamics and streambed uplift during the Pergalla landslide reactivation in March 2016 and discussion of concurrent causes (Northern Apennines, Italy)
No full textOn March 28, 2016, the toe zone of the apparently dormant Pergalla earthslide-earthflow (Northern Apennines, Italy) had a paroxysmal reactivation. In the course of 2 days, displacements up to almost 8 m severely damaged several houses and roads. At the bottom of the slope, the emersion of rotational sliding surfaces determined the uplift of almost 3 m of the Nure river streambed that was consequently partially dammed. The paper describes the landslide event on the basis of field surveys and analysis of post-event aerial photos, as well as data from geophysical surveys and pre- to post-failure displacement monitoring. It also discusses the possible concurrent causes of the event, including antecedent rainfall, the migration of active streambed channels of Nure river toward the landslide toe in the previous year, and the existence of long-term pre-failure slow movements. It is concluded that these factors, together with the presence of sliding surfaces extending beneath the valley floor, should be primarily considered if a preventive assessment of river damming potential due to streambed uplift should be made for other similar landslides in the Apennines
Large Slow-moving Rock Slides – Earth Flows: the Case Study of Ca’ Lita Landslide (Northern Apennines, Italy)
No full textThe Ca’ Lita landslide is a large and deep-seated
mass movement located in the northern Apennines of Italy. It
consists of a complex-composite landslide that affects
Cretaceous to Eocene flysch rock masses and chaotic
complexes. The landslide head zone resumed activity in 2002
and in 2004 the landslide was totally reactivated. More than
50 m retrogression of the scarp, and about 400 m
advancement of the toe threatened villages and an important
road connecting several key industrial facilities located in the
upper watershed.
A national state of emergency was declared by the Authorities,
following the evolution of 2004. A large plan of civil
protection interventions was implemented, aimed at the
management of risk and at the identification and realisation of
structural mitigation.
The Ca’ Lita landslide is a noticeable case history both from
the geomorphic and the risk management perspectives.
The relatively fast evolution undergone by the phenomenon
from 2002 to date, and the remarkable advancement of the toe,
point out that total and partial reactivations of dormant
landslides can cause unexpected consequences in terms of
involvement of new areas that, in practice, have no previous
hazard rating assigned.
Also, the landslide is a test bed for coupled monitoring and
mitigation actions that, in a relatively short time, have
allowed passing from response, to mitigation and
preparedness phases.
In this work, the management of the emergency is presented
in the frame of monitoring, mitigation and modelling
activities that are the result of the shared effort of public
offices and research institutes
Displacements of an active moderately rapid landslide—A dataset retrieved by continuous gnss arrays
Full text linkThis paper describes a dataset of continuous GNSS positioning solutions referring to slope movements in the Ca’ Lita landslide (Northern Apennines, Italy). The dataset covers the period from 24 March 2016 to 17 July 2019 and includes time-series of the daily position of three GNSS rovers located in different parts of the landslide: head zone, upper track zone, and lower track zone. Two different types of continuous GNSS arrays have been used: one is based on high-end Leica geodetic receivers, and the other is based on low-cost effective Emlid receivers. Displacements captured in the dataset are up to more than a hundred meters and are characterized by prolonged phases of slow movement and moderately rapid acceleration phases. The data presented in this contribution were used to underline slope processes and validate displacements retrieved by the application of digital image correlation to a stack of a satellite images
'Né con Monnet né con de Gaulle': la prospettiva europeista di Raymond Aron
No full textAnalisi della prospettiva europeista nella produzione scientifica di Raymond Aron
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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