1,720,954 research outputs found
Assessing surface water-groundwater exchange dynamics for Managed Aquifer Recharge design: a case study in Muravera, Southeastern Sardinia, Italy
No full textInnovative methodological approach for the modeling of seawater intrusion in the coastal plain of Muravera (Sardinia, Italy)
No full textMany coastal areas, especially low-lying deltaic areas, have high density populations and are often important
economic areas. At the same time, their aquifers are often overexploited and subject to seawater intrusion
phenomena. Climate change, including sea-level rise, will exacerbate the vulnerability of these sensitive areas,
so it is critical to provide the complex water resource management with tools capable to consider all the
variables involved to predict appropriate scenarios for action, balancing water demand of the population and
the natural water equilibrium. Hydrogeological models are as such powerful instruments though they need to
be calibrated with enough reliable hydrogeological data.
This study is applying an innovative hydrogeological modelling approach to simulate seawater intrusion in
the coastal plain of Muravera (south-east, Sardinia). This area has been studied since the 1950s due to seawater
intrusion phenomena that have led to various socio-economic and environmental problems. Thanks to the
geological, hydrogeological, and geochemical data collected in the recent years, it has been possible to develop
a 3D numerical groundwater model of the plain.
To simulate density dependent groundwater flow and coupled solute transport, by Deltares developed,
iMOD-WQ software is used. iMOD-WQ consists of the widely used software SEAWAT, which enables density
dependent fresh-salt groundwater modelling (Langevin & Guo, 2006), and the software RT3D, for reactive
transport modelling, which in not applied in this study. iMOD is a source code adapted for parallellization and
thus speeding up the computation up to two order of magnitudes depending on the available computer codes
(Verkaik et al., 2021) and it allows fast, flexible, and consistent sub-domain modelling techniques. Unlike other
groundwater modelling software, data with different cover extension can be implemented within the iMOD
without a pre-processing phase for fitting model-grid resolution but it regrids the datasets automatically to the
selected resolutions. The software is freely available and open source, can be implemented either using the
Graphical User Interface or with Python. In this study, the latter was preferred due to its ability to facilitate
working with groundwater models and for large datasets.
Based on the conceptual geological model described in Arras et al. (2019), the plain was divided into six
geological layers with different hydraulic conductivity values, which was then voxelized to a model with 45 model
layers. The recharge values were derived from the application of Soil Water Balance code (Porru et al., 2021). The
identification of the fresh water and saltwater interface was derived from direct measurements carried out with
a multiparameter probe in deep wells (20/30 m deep) in 2021. The model was then validated using piezometric
heads, electrical conductivity values and chemical and multi-isotopes data collected between 2020 and 2021.
The implemented 3D model is a preliminary valuable tool to support groundwater management. It can also
be used to simulate the effects of future sea water intrusion under different climate change driven sea-level and
natural recharge scenarios.
Arras C., Balia R., Buttau C., Cau P., Da Pelo S., Funedda A., Ghiglieri G., Loi A., Lorrai M., Melis M.T. & Testa M. (2019)
- Hydrogeological characterisation of the Flumendosa plain. Flowpath 2019, National Meeting on Hydrogeology, 6.
Langevin C.D. & Guo W. (2006) - MODFLOW/MT3DMS–based simulation of variable-density ground water flow and
transport. Groundwater, 44(3), 339-351.
Porru M.C., Da Pelo S., Westenbroek S., Vacca A., Loi A., Melis M.T., Pirellas A., Buttau C., Arras C., Vacca S., Mason
M.L., Lorrai M., Testa M. & Botta P. (2021) - A methodological approach for the effective infiltration assessment in a
coastal groundwater. Italian Journal of Engeneering Geology and Environment, 1, 183-193.
Verkaik J., Van Engelen J., Huizer S., Bierkens M.F.P., Lin H.X. & Oude Essink G.H.P. (2021) - Distributed memory
parallel computing of three-dimensional variable-density groundwater flow and salt transport. Adv. Water Resour.,
154, 10397
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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