1,721,022 research outputs found
Studio della dinamica del paesaggio forestale attraverso l’uso di fotogrammi storici: approccio GIS multitemporale.
No full textSnow gliding and glide snow avalanches: recent outcomes from two experimental test sites in Aosta Valley (NW Italian Alps)
Full text linkWe have been continuing our research on snow gliding and glide snow avalanches in two experimental test sites in Aosta Valley Region. The sites are located in the Monterosa Ski resorts at 2100-2200 m a.s.l. and are equipped with a couple of glide-snow shoes, temperature and volumetric liquid water content (VLWC) sensors in the soil (at 5 and 15 cm depths) and in the basal snowpack layer. In the surrounding a manual snow station and an automatic weather station recorded snow and weather data. Starting from the preliminary presentation given at the ISSW 2014, we are now able to present new outcomes deriving from different analyses made on a more complete database. In the two monitoring seasons 2013-14 and 2014-15 we registered 9 glide snow avalanches: 2 cold and 7 warm-temperature events. A simple descriptive statistics of the variables registered at the moment of the glide avalanche events showed that the cold glide snow avalanche events were characterized, in average, by: i) a higher soil VLWC (26.9 % and 25.3 %) than in case of warm events (25.6 % and 24.9 %) at 5 cm and 15 cm depths, respectively; ii) a lower VLWC (0.6 %) in the snowpack basal layer than in case of warm events (2.5 %); iii) a slightly higher soil temperature at 5 and 15 cm depths (difference of 0.1 and 0.3 °C respectively) than in case of warm events. In the only warm glide snow avalanche event which presented a continuous gliding before, the daily glide rate showed a significant exponential relationship with the soil VLWC at both depths. Conversely, we did not found any relationship between the glide rate and the driving factors in the continuous cold gliding periods, as we have recently found in another experimental test site in the same region. In conclusion, this study contributes to assess the importance of soil VLWC, which seems to be one of the most important driving factor for gliding processes. Therefore, this study supports the need, already suggested by other scientists, of analysing such processes with an interdisciplinary approach which integrates snow and soil sciences
Impact of Deep-seated Gravitational Slope Deformation on urban areas and large infrastructures in the Italian Western Alps
No full textDeep-seated Gravitational Slope Deformations (DsGSDs) are huge ground-deformation slow evolving phenomena, highly widespread in alpine territory. Their long-lasting evolution, with continuous deformation rate, may represents a natural hazard, able to endanger various anthropic structures and infrastructures. Until today, the development of technical and regulatory tools, aimed to effectively manage the interactions between DsGSDs and anthropic elements, has been generally lightly considered in risk management and land use planning. The definition of the type and severity of impacts on the anthropic elements, becomes increasingly important in terms of urban planning and risk management, and deserve an update in the current adopted procedures. Focusing on the Western Italian Alps, we implemented an interdisciplinary analysis, based on multi-source data, by means of geoinformatics, remote sensing and archive consultation approaches. Intersecting DsGSDs available information with the urbanized territory in a Geographic Information System environment, we obtained, despite the high data heterogeneity, an overall framework of the existing interactions. Specifically, we defined the interactions between these large phenomena and buildings, roads and rail networks, and linear infrastructures, as penstocks, waterworks or dams, also highlighing the state of activity of the inventoried phenomena. Moreover, we analysed the degree of the DsGSD impacts on the anthropic elements, detecting and classifying all the documented damages within the Italian Western Alps territory. The obtained results highlight the need for an innovative approach in DsGSDs risk assessment, both in terms of the definition of their behavior over time and of their impacts on the anthropic elements, for a more effective land use planning and a proper handling of these phenomena in the legislation framework
Analysis of the sea cliff collapse and the subsequent fall of the Camogli cemetery on February 22th, 2021 (Liguria, Italy)
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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
The employment of MODIS time series and soil temperature to monitor snow cover in the Majella National Park (Italian Central Apennines)
No full textVariations 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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