1,720,975 research outputs found
Preliminary results of a 3-D groundwater flow model in an arid region of NE Algeria using PMWin: The Inféro-flux phreatic aquifer (Biskra)
No full textInféro-flux phreatic aquifer (Biskra, NE Algeria) is overexploited for irrigation and drinking water purposes since the fifties. The effect is a quali-quantitative deterioration of the groundwater resources mostly due to an insufficient natural recharge. WADIS-MAR Project aims to the realization of a Managed Aquifer Recharge (MAR) in the Biskra area in order to contribute to re-pressuring the piezometric level of the Inféro-flux. Groundwater flow models can contribute to the understanding of the groundwater behaviour related to the impact of existing and future activities on groundwater resources including the realization of an MAR system. In this work, the preliminary results for a groundwater flow model developed for the Inféro-flux aquifer are presented. They include the model construction and the results of the steady state calibration based on the piezometric head measured in 1966
Polyphasic deformation of the Mesozoic and tertiary succession in the Supramonte (Eastern Sardinia) [Deformazione polifasica della successione mesozoica e terziaria del Supramonte (Sardegna orientale)]
No full textDuring Tertiary, the Palaeozoic crystalline basement and the Mesozoic-Lower Eocene cover of Eastern Sardinia, have been affected by a transcurrent tectonics, with contemporaneous development of both transpressive and transtensive structures. Recent geological survey carried in the Supramonte area and a more detailed structural analysis also supported by 3D geological modeling, allow us to recognise a more complicated architecture that involved both thrusts and related folds and strike-slip faults. At first the rigid basement blocks was displaced along planar, high angle reverse faults and the sedimentary Mesozoic cover was deformed as a forced-folding system. After that the sinistral strike-slip faults, and related structures, clearly post-date the thrust. Therefore, a two stage of evolution can be supposed, probably related to the same geodynamic evolution related to the deformation of a rigid crustal block with a sedimentary cover, bounded by E-W dextral transpressive strike-slip faults and NE-SW sinistral strike-slip faults, pushed-upward and toward the east
La Carta geologico-strutturale e giacimentologica dell'area di Baccu Locci. (PRIN 2005- Deformazione, circolazione idrotermale e minerogenesi durante l'evoluzione tettonica di un orogene: il basamento ercinico della Sardegna centro-meridionale).
No full textGoing 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
Structural and giacimentological map of the the Baccu Locci area (Prin2005-national research project: Deformation, hydrothermal circulation and minerogenesis in an evolving orogen: The Hercynian basement of central-southern Sardinia) [La carta geologico-struttuale e giacimentologica dell'area di Baccu Locci (Prin-2005 - Deformazione, circolazione idrotermale e minerogenesi durante l'evoluzione tettonica di un orogene: il basamento ercinico della Sardegna centro-meridionale)]
No full textIn order to investigate the relationships between deformation structures and metallic ore deposits, a detailed field work (both structural and giacimentological) has been carried out in the in the Hercynian basement of SE-Sardinia, where different types of mineralizations are hosted. The main product of this field mapping is that different mineralizations are related to different structures, highlighting a strong control of pre-existing structures to ore deposit geometries and typologies. Moreover, the study of the ore deposits, provides a key in the unraveling the tectonic evolution of the investigated area, particularly the extensional one
Structural analysis by 3D modelling of the transcurrent area of Lanaitto Valley (NE Sardinia)
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