GNGTS 2017 - 36° Convegno Nazionale

GNGTS 2017 S essione 3.2 637 The gradient map does not show clues of relevant features, except for some very localized bipolar anomalies ascribable to metal objects buried in the shallow subsurface. GPR survey was performed using a SIR-3000 system of GSSI, equipped with a 400 MHz antenna. Profiles were carried out along parallel traces 1 m spaced. The 2D profiles have been rearranged in time-slices to obtain a three-dimensional model of the electromagnetic reflectivity of the shallow sub-soil, until a depth of about 2 m. By analyzing the main reflection hyperbola, we considered an average velocity of 0.1 m/ns for the electromagnetic waves to convert the time-slices in depth-slices. The GPR depth-slice ranging from 0.5 to 1 m (Fig. 1b) shows linear anomalies ESE-WNW oriented that retraces the magnetic ones. In the south-western part of the map a clear curved anomaly 6-8 m wide is present. In correspondence, the magnetic map shows a low value anomaly with a similar shape. Discussion and conclusions. A comparison between GPR and magnetometric data, constrained by DSM, highlights numerous buried features coherently arranged respect to the ancient urban pattern, clearly visible in the western area, close to the Agora. Moreover, an arcuate geophysical anomaly, visible in the south-eastern portion of the investigated area, could be consistent with a large scale architectural element. The integration between the georadar depth-slices and the magnetometric and gradiometric maps shows a good correlation between electromagnetic reflectivity and magnetic field anomalies. This suggests the hypothesis that the reflective bodies highlighted by the GPR survey are generally also the sources of the magnetic anomalies of main archaeological interest. References Agisoft, 2013. Agisoft website <http://www.agisoft.ru >. St. Petersburg, Russia 2015. Chianese, D., D’Emilio, MG., Di Salvia, S., Lapenna, V., Ragosta, M., Rizzo, E. [2004] Magnetic mapping, Ground Penetrating Radar surveys and magnetic susceptibility measurements for the study of the archaeological site of Serra di Vaglio (Southern Italy). Journal of Archaeological Science 31 (5): 633-643. Fonstad, M. A., Dietrich, J. T., Courville B. C, Jensen, J. L., Carbonneau, P. E., [2013] Topographic structure from motion: a new development in photogrammetric measurement. Earth Surf. Process. Landforms 38, 421–430. Micheletti, N., Chandler, J.H., Lane, S. N., [����� ��������� ���� ������ ����� ��������������� ���������������� 2015�] Structure from Motion (SfM) Photogrammetry. Geomorphological Techniques, Chap. 2, Sec. 2.2. Pelagatti, P. [1985] Ricerche nel quartiere orientale di Naxos e nell’agorà di Camarina, in Kokalos 30-31, 2,679-680. Ranieri, G., Godio, A., Loddo, F., Stocco, S., Casas, A., Capizzi, P., Messina, P., Orfila, M., Cau, M.A., Chávez, M.E. [2016] Geophysical prospection of the Roman city of Pollentia, Alcúdia (Mallorca, Balearic Islands, Spain). Journal of Applied Geophysics, 134, 125-135. Rizzo, E., Chianese, D., Lapenna, V. [2005] Magnetic, GPR and geoelectrical measurements for studying the archaeological site of ‘Masseria Nigro’ (Viggiano, Southern Italy). Near Surface Geophysics 3 (1), 13-19. Small scale characterization of vine plant Root Water Uptake via 3D electrical resistivity tomography and Mise-à-la-Masse method: a case study in a Bordeaux Vineyard (France) B. Mary 1 , L. Peruzzo 2,3 , J. Boaga 1 , M. Schmutz 3 , Y. Wu 4 , S.S. Hubbard 4 , G. Cassiani 1 1 Dipartimento di Geoscienze, Università degli Studi di Padova, Italy 2 GO-Energy, Geosciences Division at Lawrence Berkeley National Laboratory, Berkeley, CA, USA 3 EA G&E 4592, Bordeaux INP, University Bordeaux Montaigne, Pessac, France 4 Earth and Environmental Sciences, Lawrence Berkeley National Laboratory, Berkeley, CA, USA We applied the 3D electrical resistivity tomography (ERT) and Mise-à-la-Masse (MALM) methods to highlight vine plant RootWater Uptake (RWU) in a vineyard in the Bordeaux district, France. The site presents a well-known pedological setting and was recently characterized via geophysical surveys (Mary et al., 2017, in prep). Two plants growing in a sandy-loamy layers were selected for the experiment. During a scheduled irrigation (240 liters of water during