1,720,976 research outputs found
Comparison of water level, extensometric, DInSAR and simulation data for quantification of subsidence in Murcia City (SE Spain)
No full textSubsidence due to groundwater overexploitation has been recognized in the metropolitan area of Murcia (25 km2) in south-eastern Spain since the early 1990s. Previous published works have focused their attention on land subsidence that occurred during the drought period between 1995 and 2008. This work first analyzes the groundwater recovery that has occurred since 2008 and then determines the kind of associated ground deformation detected by the new extensometric data. Subsequently, subsidence time series are computed on 24 geotechnical boreholes scattered throughout the study area by means of a hydro-mechanical finite element code and a linear-elastic constitutive law. A spatio-temporal interpolation of the numerically modeled surface displacements is performed over the whole domain and compared with extensometers and DInSAR-derived displacement maps in two different periods: the drought period from 2004 to 2008, and the recovery period from 2008 to 2012. In spite of the limited information on the geomechanical parameters characterizing the modelled geological formations, the proposed approach is able to discriminate areas where the soils have an elastic behavior (small differences in the comparisons) or an elasto-plastic behavior (large differences in the comparisons). This zonation enhances the understanding of the subsidence phenomenon in Murcia City and could prevent, from a quantitatively point of view, future severe subsidence due to aquifer overexploitation
Comparison of 2D models for the simulation of the october 1954 debris flow and flood event at Maiori (Campania Region, Italy)
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Applicazione di tecniche satellitari e geofisiche al monitoraggio di subsidenza e sinkholes a Telese Terme (BN)
No full textEnvironmental effects of the groundwater rebound in the eastern plain of Naples (Italy)
No full textSince 1990, in the eastern plain of Naples a generalized groundwater rebound phenomenon has occurred, caused by the sharp reduction of the withdrawals which had overexploited the plain aquifer until 1989. The present study aims to investigate, for 1989-2013 period, the groundwater flooding and ground uplift related to the groundwater rebound, by a coupled analysis of multi-temporal hydrogeological and DInSAR data of this area. Results show a generalized rise of groundwater levels from 1990, varying from 6.0 to 16.0 m, whereas localized impacts of groundwater flooding on buildings and agricultural soils have started since 2006. An uplift trend is observed in ground deformations (up to +40 mm), caused by the increase of pore water pressure in the aquifer system, following to groundwater rebound. This result opens new perspectives in assessment, mitigation and management of geohazards not considered by the Italian legislation
Integrated monitoring system for ground deformation hazard assessment in Telese Terme (Benevento province, Italy)
No full textEngineering-geological and hydraulic modeling of the September 9, 2010 complex event at Atrani (Salerno province)
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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
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