Geological-geophysical approach to study ground water movement between two open-pit pools in a computer-aided recovery project of a bandoned mine escavations in Sardinia, Italy (Contributo in atti di convegno)

Type
Label
  • Geological-geophysical approach to study ground water movement between two open-pit pools in a computer-aided recovery project of a bandoned mine escavations in Sardinia, Italy (Contributo in atti di convegno) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Alternative label
  • Fadda S.1; Fais S.2; Fiori M.1; Ligas P.2; Matzuzzi C.1 (2009)
    Geological-geophysical approach to study ground water movement between two open-pit pools in a computer-aided recovery project of a bandoned mine escavations in Sardinia, Italy
    in Proceedings of the 11 th International Conference on Environmental Science and Technology, Chania, Creta, Grecia, 3 - 5 September 2009
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Fadda S.1; Fais S.2; Fiori M.1; Ligas P.2; Matzuzzi C.1 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#altreInformazioni
  • Atti del Convegno, pagg B238-245 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1 Istituto di Geologia Ambientale e Geoingegneria (IGAG) del CNR, UOS di Cagliari, Università di Cagliari 09100 Cagliari; 2 Dipartimento di Geoingegneria e Tecnologie Ambientali (DIGITA), Università di Cagliari 09100 Cagliari (literal)
Titolo
  • Geological-geophysical approach to study ground water movement between two open-pit pools in a computer-aided recovery project of a bandoned mine escavations in Sardinia, Italy (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#isbn
  • 978-960-7475-46-6 (literal)
Abstract
  • In central Sardinia several talc-chlorite-feldspar bodies have been long mined by open-pit operations. This mining activity has deeply modified the original landscape of the Lasasai-Bonucoro area in the district of Orani. Thus the rearrangement of this site, in particular of the open-pit works that are now occupied by newly formed pools filled with water from aquifers, should be considered as an overall project of landscape restoration. The project team have focused on developing a combination of computer techniques which facilitate interaction with GPS topography survey data and subsequent geoprocessing with the aim to generate a realistic virtual representation of the rearranged area. The study started with a close analysis of the Lasasai-Bonucoro area, as regards geomorfological and geographical issues, for the definition of the landscape. This required the collection of a large amount of data by both public and private institutions and by means of on-site surveys. The authors have flown the mine site and its associated operation and storage areas to document existing features at each site. The preparatory work consisted in the characterisation of the area through a topographic survey, then a geodetic control network was established by the use of GPS technique to describe the morphologic features of the landscape for the subsequent three dimensional analysis and geoprocessing by commercial GIS/CAD software. A geophysical investigation by Very Low Frequency (VLF) electromagnetic method (EM) was carried out to characterize the crystalline basement rocks in the area with the aim to localize in depth the presence of geological structures, as structural discontinuities, that can guide groundwater circulation between the newly formed pools. The surface geological data were integrated with VLF-EM data to detect and to map fracture/fault zones within the crystalline basement because the high resistivity contrast which normally occur between the solid rocks and saturated fracture/fault zones. The results of the electromagnetic survey were very efficient in mapping the buried target providing useful information to investigate a connection between the two studied pools. The final step is represented by the use of a Digital Scenery Generator (DSG) for the creation of virtual 3D environments thus giving an imagination of a present, past or future landscape development also allowing for visual impact assessments. Particular conditions, such as the constant outflow of good-quality water and the amenity of the surrounding countryside, are favourable to the accomplishment of the recovery plan. (literal)
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