1,721,115 research outputs found
Il telerilevamento nella gestione del patrimonio territoriale: un esempio di studio dei fenomeni franosi del Molise
No full textLandslides analysis from remote sensing ad Gis: an example from Molise Region, Central Italy.
No full textUn contributo del telerilevamento nell’analisi del rischio geoambientale: i fenomeni franosi del settore nord-occidentale del Molise
No full textAssetto geologico e possibile sviluppo di fenomeni di sinkhole lungo la "linea Val Roveto-Atina".
No full textRelationship between karstic landforms and neotectonic in the western Marsica (Central Appenine, Italy) inferred from photogeological analisys.
No full textThe aim of this work is to show the relationship between karstic landforms and neo-tectonics in the southern sector of the Western Marsica region. The investigated area is located in the Colle Rotondo-Colle Terelle structure (southern Latium) between the towns of Pescosolido and Alvito. It is an elongated Apennine-trending morphological place, bounded by some of the most relevant regional tectonic features of the whole Apennines, such as the Simbruini-Ernici Mts. leading thrust and the Val Roveto-Atina-Caserta line. Here the Meso-Cenozoic carbonate deposits of the Latium-Abruzzi sequence, the Upper Miocene terrigenous and Plio-Quaternary continental deposits outcrop. In more detail the area belongs to a sector of the Apennines, which has been intensively deformed by Neogene-Quaternary compressional and extensional tectonics. This sector of the chain mostly formed in Neogene times in the context of the eastwards piggy-back propagation of thrust sequence and was broken up by Plio-Quaternary distensive tectonics. Intepretation of aerial photographs and field surveys allowed a detailed analysis of hydrography, karstic morphology and Quaternary tectonic evidence. The Colle Rotondo-Colle Terelle structure is a still active karstic area; the coexistence of epigeous forms and processes at different grades of evolution makes it a nearly unique zone. At the foot of the structure the copious Fibreno springs are located, which act as the present base level for karstic erosion. Along the Apenninic-trending tectonic alignments the greatest karstic phenomena of the whole area are present. The main dolines of the area, developed along tectonic directions with Apennine trend, show morphological evidence of stasis periods in their evolution, related with Quaternary tectonic activity. They are represented as different erosional surfaces within the dolines themselves as well as abandoned valleys. The analysis and classification of the both karstic forms and their mutual relationships show that the main Quaternary tectonic events modified the karstic morphogenesis
A Double Scale Methodology to Investigate Flow in Karst Fractured Media via Numerical Analysis: The Cassino Plain Case Study (Central Apennine, Italy)
Full text linkA methodology to evaluate the hydraulic conductivity of the karst media at a regional scale has been proposed, combining pumping tests and the hydrostructural approach, evaluating the hydraulic conductivity of fractured rocks at the block scale. Obtaining hydraulic conductivity values, calibrated at a regional scale, a numerical flow model of the Cassino area has been developed, to validate the methodology and investigate the ambiguity, related to a nonunique hydrogeological conceptual model. The Cassino plain is an intermontane basin with outstanding groundwater resources. The plain is surrounded by karst hydrostructures that feed the Gari Springs and Peccia Springs. Since the 1970s, the study area was the object of detailed investigations with an exceptional density of water-wells and piezometers, representing one of the most important karst study-sites in central-southern Italy. Application of the proposed methodology investigates the hydraulic conductivity tensor at local and regional scales, reawakening geological and hydrogeological issues of a crucial area and tackling the limits of the continuum modelling in karst media
New insights on bedrock morphology and local seismic amplification of the Castelnuovo village (L'Aquila Basin, Central Italy)
No full textThe Castelnuovo village is placed on a small NW-SE trending ridge, approximately 60 m higher than the valley floor, occupying a portion of the larger continental L'Aquila Basin (Central Italy). During the April 6, 2009 L'Aquila earthquake (Mw 6.3), the village suffered heavy damage. Several studies investigated the local seismic amplification of the Castelnuovo area employing geotechnical, geophysical, and geological surveys, together with 1D, 2D and 3D numerical models. However, all these studies relied on shallow geotechnical and geophysical surveys, which do not reach the engineering bedrock and do not constrain the presence of an impedance contrast at depth. To date, no detailed study has been carried out to assess the depth of the engineering bedrock. In this work, we fill this gap by executing two deep boreholes reaching the engineering bedrock, tied with an extensive campaign of microtremor measurements all over the Castelnuovo ridge and the surrounding plain. The interpretation of such new data, together with analytical, numerical, and geostatistical techniques, demonstrates that local seismic amplification is linked to a strong impedance contrast at more than 200-m depth beneath the Castelnuovo village associated with the lithological transition between clayey silts and breccias. Such results differ from those provided by previous studies, where such impedance contrast was considered shallower, and represent a milestone for assessing the local seismic hazard of the area
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
Hydrogeological insights and modelling for sustainable use of a stressed carbonate aquifer in the Mediterranean area. From passive withdrawals to active management
Full text linkStudy area: Venafro Mts., southern-central Italy, Mediterranean basin. Study focus: Via a collection of geological and hydrogeological data, a flow conceptual model of a carbonate aquifer has been coupled with a numerical model via MODFLOW code and Unsaturated Zone Flow (UZF) package in steady state and transient conditions. Simulation is further implemented with different management scenarios, for facing possible emergencies due to recharge decrease, also simulating a drastic water abstraction cut-off. New hydrological insights for the region: Carbonate fractured aquifers are a strategic water resource in the whole Mediterranean area, supplying major metropolitan areas. Despite these huge extensions, such groundwater systems are threatened by increasing drought occurrence and significant human water abstraction. A characterization of a carbonate fractured aquifer (370 km2) located in central-southern Italy has been performed. Venafro Mts. Aquifer (VMA) hosts a strategic resource for the Western Campania Waterworks (WCW) that supplies the populous metropolitan area of Naples, with 3.8 million inhabitants. VMA shows a slow response, with recovery time estimated at the decennial scale, testifying its limited resilience to natural and human pressures. A shift is proposed from passive management to a more comprehensive concept of smart-water monitoring, applied not only to waterworks and pipelines, but also to groundwater resources in the environment
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