1,720,961 research outputs found
CARATTERIZZAZIONE GEOLOGICO-GEOMORFOLOGICA DEL CORSO DEL F. METAURO (PU, MARCHE) FINALIZZATA ALLA VALUTAZIONE DEL TRASPORTO SOLIDO.
No full textThe increase in intense weather and climatic events together with the anthropogenic pressure induce in the streams an imbalance in the overall river system. From a physical point of view this results in an increase in solid transport with a consequent intensification in potential hydraulic risks. The study discusses the fluvial dynamic evolution of the Metauro River (Central Apennine Hydrographic District, Marche, Italy) and the importance of monitoring solid transport in the riverbed with particular attention to the identification of source areas and material mobility. The River Metauro has a drainage area of 1043.6 km2, has minimum discharges of 2 m3/s and maximum discharges of 1100 m3/s. The runoff times is 14.3 h; the main tributaries are Candigliano, Bosso and Burano. With the support of GIS software (QGIS and ArcGIS), an initial assessment was done with the creation of a map of the Stream LengthGradient Index to interpret the changes of riverbed longitudinal profiles at steady-state conditions in relation to local geomorphology and sediment variation. A second map defining the susceptibility of the basin to erodibility was obtained. The study is still under development, and the methodology will involve the use of direct and indirect methods for material quantification and distribution and sampling for chemical and physical analysis
Identification of the fluvial sediment source areas in the Burano catchment basin (Cantiano, PU)
No full textClimate change and increasing anthropogenic pressure are two of the major drivers of increased frequency and the intensity of highly disastrous events like flash-floods in the drainage network. This is the case of Burano watercourse flooding, a tributary of the Metauro river, in the northern Marche region where high flow rates were recorded in a few hours in September 2022. This event resulted in about 13 fatalities, 50 injuries and critical damages to infrastructure during the disastrous inundation. In this scenario, the current strength also generates solid transport of large amounts of sediments, increasing the hydrogeological risk of flooding in densely populated areas located close to the river bank. Therefore, the main purpose of this work is understanding solid transport, focusing on the identification and characterization of the sediment sources and sink areas by a GIS-based remote sensing approach. Source material comes from both linear zones, where the detritus moves along a well-defined direction, and areal sources understood as landslides along slopes and extensive erosion zones (e.g. gullies), which demonstrate a connection with the hydrographic network. Through new geomorphometric approaches, it is possible to characterize spatial patterns of sediment connectivity by enabling the quantitative modeling of sediment discharge. The proposed methodology consists of a study of the current geomorphological framework as well as an analysis of morphological variations in the riverbed that result in changes in width, profile and pattern of the river, and a characterization of the sediment along the water network. Preliminary analysis of satellite imagery among different time periods (1977, 1987 and 2022) are performed to study the evolutionary trends of river network and longitudinal profiles of channels are also used to highlight anomalies in steepness (knickpoints or kinckzones). Landslide and areas characterized by an intense erosion, provided by various databases (e.g. Hydrogeological Basin Plans - PAI, Italian Landslide Inventory - IFFI) and collected during fieldwork, are joined in a database in GIS environment allowing to create a new geomorphological map of the upper part of the Metauro basin. Moreover, lithology (substrate and quaternary deposits), slope, presence of vegetation, the sources and the distance of hydrographic network are some of geomorphological features taken into consideration for the estimation of the sediment. The results obtained during the process allowed to define the source sediment areas and to create a landslide susceptibility map, with the union of all the data it was possible to analyze sediment connectivity along the riverbed. The applications demonstrate that a reliable assessment of sediment connectivity via geomorphometric approach, especially when integrated with a sediment sources inventory, is useful for giving management priorities by the competent authorities in reducing hydrogeological risk
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
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Landslide susceptibility assessment in complex geological settings: sensitivity to geological information and insights on its parameterization
Full text linkThe literature about landslide susceptibility mapping is rich of works focusing on improving or comparing the algorithms used for the modeling, but to our knowledge, a sensitivity analysis on the use of geological information has never been performed, and a standard method to input geological maps into susceptibility assessments has never been established. This point is crucial, especially when working on wide and complex areas, in which a detailed geological map needs to be reclassified according to more general criteria. In a study area in Italy, we tested different configurations of a random forest–based landslide susceptibility model, accounting for geological information with the use of lithologic, chronologic, structural, paleogeographic, and genetic units. Different susceptibility maps were obtained, and a validation procedure based on AUC (area under receiver-operator characteristic curve) and OOBE (out of bag error) allowed us to get to some conclusions that could be of help for in future landslide susceptibility assessments. Different parameters can be derived from a detailed geological map by aggregating the mapped elements into broader units, and the results of the susceptibility assessment are very sensitive to these geology-derived parameters; thus, it is of paramount importance to understand properly the nature and the meaning of the information provided by geology-related maps before using them in susceptibility assessment. Regarding the model configurations making use of only one parameter, the best results were obtained using the genetic approach, while lithology, which is commonly used in the current literature, was ranked only second. However, in our case study, the best prediction was obtained when all the geological parameters were used together. Geological maps provide a very complex and multifaceted information; in wide and complex area, this information cannot be represented by a single parameter: more geology-based parameters can perform better than one, because each of them can account for specific features connected to landslide predisposition
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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