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Bitelli, G.
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Bitelli, G.
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- PublicationRestrictedGeophysical survey at Talos Dome, East Antarctica: the search for a new deep-drilling site(2004)
; ; ; ; ; ; ; ; ; ; ; ; ; ;Frezzotti, M.; ENEA, Centro Ricerche Casaccia, P.O. Box 2400, I-00100 Rome, Italy ;Bitelli, G.; DISTART, University of Bologna, Viale Risorgimento 2, I-40136 Bologna, Italy ;De Michelis, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Deponti, A.; Department of Environmental Sciences, University of Milano–Bicocca, Piazza della Scienza 1, I-20126 Milan, Italy ;Forieri, A.; Department of Earth Sciences, University of Milan, Via Cicognara 7, I-20129 Milan, Italy and Department of Earth Sciences, University of Siena, Via del Laterino 8, I-53100 Siena, Italy ;Gandolfi, S.; DISTART, University of Bologna, Viale Risorgimento 2, I-40136 Bologna, Italy ;Maggi, V.; Department of Environmental Sciences, University of Milano–Bicocca, Piazza della Scienza 1, I-20126 Milan, Italy ;Mancini, F.; DISTART, University of Bologna, Viale Risorgimento 2, I-40136 Bologna, Italy ;Remy, F.; Legos, CNRS-CNES-UPS, 18 av. Edouard Belin, 31055 Toulouse Cedex, France ;Tabacco, I. E.; Department of Earth Sciences, University of Milan, Via Cicognara 7, I-20129 Milan, Italy ;Urbini, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Vittuari, L.; DISTART, University of Bologna, Viale Risorgimento 2, I-40136 Bologna, Italy ;Zirizzotti, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; ; ; ; ; ; ; ; ; ; ; ; Talos Dome is an ice dome on the edge of the East Antarctic plateau; because accumulation is higher here than in other domes of East Antarctica, the ice preserves a good geochemical and palaeoclimatic record. A new map of the Talos Dome area locates the dome summit using the global positioning system (GPS) (72˚47’ 14’’S, 159˚04’ 2’’E; 2318.5m elevation (WGS84)). A surface strain network of nine stakes was measured using GPS. Data indicate that the stake closest to the summit moves south-southeast at a few cma–1. The other stakes, located 8 km away, move up to 0.33ma–1. Airborne radar measurements indicate that the bedrock at the Talos Dome summit is about 400m in elevation, and that it is covered by about 1900m of ice. Snow radar and GPS surveys show that internal layering is continuous and horizontal in the summit area (15 km radius). The depth distribution analysis of snow radar layers reveals that accumulation decreases downwind of the dome (north-northeast) and increases upwind (south-southwest). The palaeomorphology of the dome has changed during the past 500 years, probably due to variation in spatial distribution of snow accumulation, driven by wind sublimation. In order to calculate a preliminary age vs depth profile for Talos Dome, a simple one-dimensional steady-state model was formulated. This model predicts that the ice 100m above the bedrock may cover one glacial–interglacial period.485 33 - PublicationOpen AccessQualitative and quantitative photogrammetric techniques for multi-temporal landslide analysis(2006-08)
; ; ; ; ; ;Zanutta, A.; Dipartimento di Ingegneria delle Strutture, dei Trasporti, delle Acque, del Rilevamento, del Territorio (DISTART), Università degli Studi di Bologna, Italy ;Baldi, P.; Dipartimento di Fisica, Università di Studi di Bologna, Italy ;Bitelli, G.; Dipartimento di Ingegneria delle Strutture, dei Trasporti, delle Acque, del Rilevamento, del Territorio (DISTART), Università degli Studi di Bologna, Italy ;Cardinali, M.; Istituto di Elettronica e di Ingegneria dell’Informazione e delle Telecomunicazioni (IEIIT), CNR, Bologna, Italy ;V, A.; Istituto di Ricerca per la Protezione Idrogeologica (IRPI), CNR, Perugia, Italy; ; ; ; The results of two survey methods, geological photointerpretation and historical photogrammetry, are compared in order to evaluate the temporal evolution of a unstable slope located in the Tuscan-Emilian Apennines (Italy). Historical aerial photos of the area, derived from photogrammetric surveys conducted in 1954 (scale 1:60000), in 1971 (scale 1:20000), and in 1976 (scale 1:17000) were available. A photogrammetric flight was further conducted in 2000, at a scale of 1:4400, with a traditional GPS ground survey support. First, the results of photographic analysis with the photointerpretation method are presented: the landslides are described from a geological point of view, showing its temporal evolution. To quantitatively assess the landslide movements, Digital Terrain Models were generated by means of an analytical plotter and a digital photogrammetric workstation, with semi-automatic and automatic procedures. To generate these products, it was necessary to solve problems related to a lack of data concerning the aerial cameras used for the historical flights (internal orientation) and the difficulty identifying control points on the photos in order to define the external orientation. An unconventional photogrammetric methodology, based on identification of homologous points in zones considered outside the landslide area, has been there developed and tested to insert the various surveys into a single reference system.310 1154 - PublicationRestrictedVLNDEF Project for Geodetic Infrastructure Definition of Northern Victoria Land, Antarctica(2008)
; ; ; ; ; ; ; ; ; ; ; ; ; ;Capra, A.; DIMeC, Universita’ di Modena e Reggio Emilia ;Dubbini, M.; DIMeC, Universita’ di Modena e Reggio Emilia ;Galeandro, A.; DIASS, Politecnico di Bari ;Gusella, L.; DISTART, Universita’ di Bologna ;Zanutta, A.; DISTART, Universita’ di Bologna ;Casula, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia ;Negusini, M.; IRA – INAF, Bologna ;Vittuari, L.; DISTART, Universita’ di Bologna ;Sarti, P.; IRA – INAF, Bologna ;Mancini, F.; DAU, Politecnico di Bari ;Gandolfi, S.; DISTART, Universita’ di Bologna ;Montaguti, M.; DISTART, Universita’ di Bologna, IRA – INAF, Bologna ;Bitelli, G.; DISTART, Universita’ di Bologna; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;Capra, A.; DIMeC, Universita’ di Modena e Reggio Emilia ;Dietrich, R.; Technische Universitat of Dresden, Germany; Scientific investigations in Antarctica are, for many different reasons, a challenging and fascinating task. Measurements, observations and field operations must be carefully planned well in advance and the capacity of successfully meeting the goals of a scientific project is often related to the capacity of forecasting and anticipating the many different potential mishaps. In order to do that, experience and logistic support are crucial. On the scientific side, the team must be aware of its tasks and be prepared to carry out observations in a hostile environment: both technology and human resources have to be suitably selected, prepared, tested and trained. On the logistic side, nations, institutions and any other organisation involved in the expeditions must ensure the proper amount of competence and practical support. The history of modern Italian Antarctic expeditions dates back to the middle 80’s when the first infrastructures of “Mario Zucchelli Station”, formerly Terra Nova Bay Station, were settled at Terra Nova Bay, Northern Victoria Land. Only a few years later, the first geodetic infrastructures were planned and built. Italian geodetic facilities and activities were, ever since, being constantly maintained and developed. Nowadays, the most remarkable geodetic infrastructures are the permanent Global Positioning System (GPS) station (TNB1) installed at Mario Zucchelli and the GPS geodetic network Victoria Land Network for DEFormation control (VLNDEF) entirely deployed on an area extending between 71° S and 76° S and 160° E and 170° E. These facilities do not only allow carrying out utmost geodetic investigations but also posses interesting capacities on the international multidisciplinary scientific scenario. In order to fully exploit their potentiality, management and maintenance of the infrastructure are crucial; nevertheless, in order to perform high quality scientific research, these abilities must be coupled with the knowledge concerning a proper use and a correct processing of the information that these infrastructures can provide. This work focuses on the different methods that can be applied to process the observations that are performed with GPS technique in Northern Victoria Land, aiming at reaching the highest accuracy of results and assuring the larger significance and versatility of the processing outcomes. Three software were used for the analysis, namely: Bernese v.5.0, Gipsy/Oasis II and Gamit/Globk. The working data sets are (i) the permanent GPS station TNB1 observations continuously performed since 1998 and (ii) the five episodic campaigns performed on the sites of VLNDEF. The two infrastructures can be regarded as neat examples of standard geodetic installation in Antarctica. Therefore, the technological solutions that were adopted and applied for establishing the GPS permanent station and the VLNDEF geodetic network as well as the data processing strategies and the data analysis procedures that were tested on their observation will be illustrated in detail. The results will be presented, compared and discussed. Furthermore, their potentials and role in geodetic research will be carefully described; their versatility will also be highlighted in the foreground of a multidisciplinary Antarctic international scientific activity.164 27 - PublicationOpen AccessGeophysical Survey at Talos Dome (East Antarctica)(2003)
; ; ; ; ; ; ; ; ;Frezzotti, M.; ENEA Progetto Clima, PO Box 2400, 000100 Roma AD - Italy ;Bitelli, G.; Dipartimento di Ingegneria delle Strutture, dei Trasporti, delle Acque, del Rilevamento, del Territorio, Università di Bologna, Viale Risorgimento 2, 40136 Bologna - Italy ;Gandolfi, S.; Dipartimento di Ingegneria delle Strutture, dei Trasporti, delle Acque, del Rilevamento, del Territorio, Università di Bologna, Viale Risorgimento 2, 40136 Bologna - Italy ;De Michelis, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Mancini, F.; Dipartimento di Ingegneria delle Strutture, dei Trasporti, delle Acque, del Rilevamento, del Territorio, Università di Bologna, Viale Risorgimento 2, 40136 Bologna - Italy ;Urbini, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Vittuari, L.; Dipartimento di Ingegneria delle Strutture, dei Trasporti, delle Acque, del Rilevamento, del Territorio, Università di Bologna, Viale Risorgimento 2, 40136 Bologna - Italy ;Zirizzotti, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; ; ; ; ; ; ; ; ; ; ;Frezzotti, M.; ENEA Progetto Clima, PO Box 2400, 000100 Roma AD - Italy ;Maggi, V.; Department of Environmental Sciences, University of Milano–Bicocca, Piazza della Scienza 1, I-20126 Milan, Italy; Talos Dome is an ice dome on the edge of the East Antarctic plateau (Fig. l), about 290 km from the Southern Ocean and 250 km from the Ross Sea. It is adjacent to the Victoria Land mountains and overlies the eastern margin of the Wilkes Subglacial Basin. To the West, an ice saddle (2260 m) divides the Dome from an ice ridge coming from Dome C. Ice flows southeastward from this ridge into outlet glaciers (Priestley, Reeves and David Glaciers) which drain into the Ross Sea, and north-westward into the Rennick and Matusevich Glaciers which drain into the Southern Ocean. Another ice ridge trends northward from the Dome, passing behind the USARP Mountain. As part of the ITASE project, two traverse surveys were carried out in the Talos Dome area in November 1996 (Frezzotti et al., 1998) and January 2002 (Frezzotti et al., this volume). Airborne radar surveys were conducted in 1997, 1999 and 2001. Research aimed to better understand the latitudinal (North-South) and longitudinal (East-West) gradient along two East-West (Talos Dome - D66) and North-South (GV7 - Talos Dome - Taylor Dome) transepts, documenting climatic, atmospheric and surface conditions in the Talos Dome area and northern Victoria Land throughout the last 200-1000 years. The study of the Talos Dome area aimed to find the best location to extract an ice core down to the bedrock. Six shallow snow-firn cores (two during 1996 and four during 2001-02), up to 90 m deep, were drilled in the Talos Dome area. An eight century-long record of volcanic signal and climatic change was obtained at Talos Dome through geochemical analysis of the deepest core (TD, 90 m deep), drilled in 1996 (Becagli et al., 2003; Narcisi et al., 2001; Stenni et al., 2002). The core was dated through seasonal variations in nss SO4 raised to the power of 2- concentrations coupled with the recognition of tritium marker level (1965-66) and the nss SO4 raised to the power of 2- spikes attributed to the most important historical volcanic events (Pinatubo 1991, Agung 1963, Krakatoa 1883, Tambora 1815, Kuwae 1452, Unknown 1259).14224 297