1,721,009 research outputs found
An integrated model for prediction of shallow landslides at regional scale with the integration of satellite hydrological data
No full textUsing satellite soil moisture and rainfall data for the monitoring and the prediction of natural hazards
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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
Expected Changes in Rainfall-Induced Landslide Activity in an Italian Archaeological Area
No full textCultural heritage is one of the most exceptional resources characterizing the Italian territory. Archaeological heritage, i.e., the archaeological sites with different types of archaeological artifacts, strongly contributes to enriching the national and international cultural heritage. Nevertheless, it is constantly exposed to external factors, such as natural deterioration, anthropic impact, and climate-related hazards, which may compromise its conservation. In Italy, many archaeological areas are affected by significant soil settlements that involve a large part of monuments. This paper focuses on the landslide hazard assessment of the archaeological site of Pietrabbondante (Molise region, Italy). The impact of the expected rainfall regimes, according to the EURO-CORDEX projections, on slope stability conditions were evaluated through the application of a physically based model that couples a hydraulic and a mechanical model to evaluate slope stability evolution due to pore pressure changes. Given the unavoidable lack of knowledge of the geotechnical soil properties in an archaeological heritage area, the proposed method considered the random uncertainty of soil parameters by means of a probabilistic approach in order to assess the stability conditions in terms of probability of occurrence of a landslide. The results of this study provide a reference for the safety assessment and preventive conservation of archaeological areas characterized by high cultural value
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
Empirical runoff thresholds: results from catchments in Central Italy
No full textUnderstanding how much runoff is generated from precipitation events is an increasingly relevant topic in the
context of climate change, especially in the Mediterranean area, where the interactions among the landscape,
topography, soil, precipitation variability and basin antecedent conditions make this process difficult to model
[e.g., 1]. Several authors have focused on defining empirical thresholds beyond which runoff (R) originates for
specific event rainfall depths (P) and the antecedent soil moisture (θ), for example, by using the Antecedent
Soil moisture Index (ASI). These approaches yielded promising results at the plot or catchments scale [2,3,4,5].
However, soil moisture is not frequently monitored in catchments – or – when it is monitored via only a few
point measurements it is not guaranteed it correctly represents the true catchment soil moisture conditions. In
recent years, the increasing development of space-born platforms has provided soil moisture estimates at
different spatial and temporal scales, offering a viable way to complement ground-based observations.
The present study integrates ground-based data and satellite soil moisture estimates to empirically evaluate
runoff thresholds in two scarcely anthropized, small to medium-sized and medium-low permeability basins in
Umbria (Central Italy). In detail, the Tatarena Creek catchment has an area of 32 km2 and is mainly covered
by flyschoid rocks; the Reschio Creek basin is 57 km2 and is characterised by layered sandstone interbedded
with thin marls and pelitic levels. Corine Land Cover 2018 images show that the two basins have different land
uses: the Tatarena is mainly characterised by agricultural areas (72%), and the Reschio basin shows broad-
leaved forest as predominant land use (60%). The Copernicus Global Land Service SWI (Soil Water Index)
1km dataset is used to estimate the antecedent soil degree of saturation. As for the ASI index, the Antecedent
SWI is introduced (ASWI, mm) by multiplying SWI values by the depth of investigation (i.e., D≈10 cm
considering a T-value of 10 [6]). Event-scale runoff thresholds have been empirically defined by analysing R
as a function of P + ASWI. Sixty-five runoff events were identified for the Tatarena Creek basin in the 2015-
2023. After the analysis, a runoff threshold of about 68 mm was obtained by the sum of the rainfall depth (P)
and ASWI. Nineteen runoff events were identified for the Reschio Creek catchment during 2020-2023 (runoff
threshold of about 75 mm). The preliminary results (Fig. 1) indicate a slightly higher P+ASWI threshold for the
Reschio catchment than the Tatarena one. The approach presented here can be helpful to investigate other
catchments, contributing to the knowledge of the rainfall-runoff process. In-depth studies are being conducted
on basins with different lithological characteristics
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