1,721,011 research outputs found
La Val Fontanabuona in Liguria; studio preliminare per un progetto di valorizzazione delle risorse agrarie,
No full textAn open-source and QGIS-integrated physically based model for spatial prediction of rainfall-induced shallow landslides (SPRIn-SL)
No full textThis paper presents a new open-source and physically based model for Spatial Prediction of Rainfall-Induced Shallow Landslides (SPRIn-SL) through the Quantum GIS (QGIS) software. SPRIn-SL consists of a set of shell scripts developed using the Python language that can be directly run from the QGIS processing toolbox through a user-friendly graphical interface. The tool implements the infinite slope method by incorporating the TOPOG and the Green-Ampt models to consider groundwater flow and transient rainfall infiltration, respectively. Furthermore, DEM pre-processing procedures to extract reliable terrain morphometric features, a new statistical method for modelling soil depth and a procedure for predictive accuracy evaluation, were implemented. By using a 1-m resolution DEM, the developed model was tested in a small coastal catchment of Cinque Terre (Liguria, Italy), providing accurate outcomes, and proving to be an easy-to-use tool for landslide susceptibility zoning which can have useful implications on the risk reductio
Le frane del 10 novembre 2014 nella bassa Val Lavagna (GE): prime analisi e riflessioni
Full text linkIntroduzione. Nella Regione Liguria, il 2014 è stato contrassegnato da diversi eventi pluviometrici intensi che hanno indotto frane e fenomeni alluvionali con conseguenze talora catastrofiche. Come spesso è accaduto nell’ultima decade, gli eventi si sono localizzati principalmente nelle parti centrale e orientale della regione (province di Genova e La Spezia). Il 10 novembre 2014, un breve ed intenso evento pluviometrico ha colpito alcuni bacini costieri del Golfo del Tigullio e delle medie valli del Fontanabuona e dello Sturla (Liguria Orientale (Figg. 1, 2). La città di Chiavari (GE) è stata particolarmente colpita dall’esondazione dei torrenti Rupinaro ed Entella mentre numerose frane, paragonabili per tipologia a quelle che il 25 ottobre 2011 hanno colpito la Liguria orientale (Cevasco et al., 2013, 2014; D’Amato Avanzi et al., 2013), hanno prodotto danni e criticità, coinvolgendo abitati e infrastrutture e provocando due vittime nel Comune di Leivi (l’area maggiormente colpita), nella bassa Val Lavagna (GE). In questo lavoro vengono sintetizzati la descrizione dell’evento pluviometrico ed i risultati dell’analisi delle serie storiche delle precipitazioni nonché dei primi rilievi, tuttora in corso, in parte presentati nel lavoro di Cevasco et al. (2015b), con alcune riflessioni riguardo alle conseguenze e al rischio di frana dell’area coinvolta
Short-term GIS analysis for the assessment of the recent active-channel planform adjustments in a widening, highly altered river: The Scrivia river, Italy
No full textFrom the 1990s onwards several Italian rivers have experienced a recent phase characterized by active-channel widening and, generally, by bed-level stability or slight aggradation. However, its triggering factors and its diffusion, along with the relationship between active-channel planform dynamics and vertical adjustments, are still quite debated and only few studies are available. This research deals with the active-channel planform changes occurred along the Scrivia River floodplain reach (NW Italy) over the period 1999-2019 and it aims at investigating in detail the ongoing geomorphological processes under the river management perspective. The study is based on a quantitative multitemporal analysis of aerial photographs and satellite images performed in a GIS environment and supported by field surveys. The outcomes revealed a generalized trend of gentle active-channel widening together with widespread bank instability and several (26% of total banks) intense and localized bank retreats involving both the modern floodplain and the recent terrace. In the investigated 20-year period, the active-channel area has increased by 22.7% (from 613.6 to 753.0 ha), its mean width by 25% (from 151.5 to 189.3 m), whereas no relevant length variations have been noticed. These morphological dynamics have been more or less pronounced both at reach scale and over time. The extreme floods occurred in the investigated period can be considered the most important triggering factor of the active-channel planform changes, most probably together with an increase of the reach-scale unit stream power due to changes in the channel geometry occurred over the 20th century
Damaging hydrological events during the exiting of the little ice age in a highland area of southern Italy
No full textHistorical documentary sources reflect a myriad of social, cultural, political, and scientific narratives about weather, climate and hydrological effectiveness. Their use in climate research provides an important contribution to current debates about climate and related damaging hydrological events. In Europe, the end of the Little Ice Age (LIA, 1840–1920) was characterized by an unusual mixture of storms, floods and landslides. They have marked profoundly the regional landscape of the highlands of the Tammaro area (Campano Apennines, Southern Italy). In this way, we found that episodes of climate variability and its extremes have often disrupted ecosystems during stormy wintertimes (September–March) by injuring plant development phases, and causing sometimes disruption, while also creating new interactions with the agricultural and social environment. The results indicated that the end of the 19th century was the stormiest period of the series 1800–2000, in conjunction with landscape deforestation started in 1850
Coupling physical laboratory and numerical modelling for the prediction of rainfall-induced landslides in the Cinque Terre area (eastern Liguria, Italy).
No full textGoing 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
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