GNGTS 2016 - Atti del 35° Convegno Nazionale

GNGTS 2016 S essione 3.2 549 the surrounding soil. The resistive anomalies at the top corners of the ERT are related to the concrete walls of the pool and a pvc drainage ring. Finally GPR radargrams have allowed to identify the top of the buried structures and results are well comparable with those obtained with 2D ERTs. Conclusions. The growing interest in underwater geophysics, as witnessed by numerous archaeological campaigns carried out in the Mediterranean region in marine and lacustrine environments involves a challenge of great importance for archaeogeophysical discipline. Through a careful use of geophysical techniques it is possible support underwater research to identify and analyse undiscovered structures placed under water or located near rivers and sea. A multi methodological approach based on the use of electric and electromagnetic techniques have showed the possibility to individuate remains in the subsoil. In this way the capability of geophysics, limited cause problems of resolution, depth of investigation and sensitivity related to each adopted technique, can be overcame or reduced. The experiments realized in controlled conditions, where geophysical measurements are acquired also in an underwater scenario, showed us the abilities of the GPR and ERTs to support a remote research performed mainly in lacustrine conditions. Good results are, indeed, obtained with 2D profiles, while 3D survey with loop-shaped grid require new efforts to individuate more effective array. References Capozzoli L., CaputiA.; DeMartinoG. GiampaoloV.; LuongoR., Perciante, F.; Rizzo E., Electrical and electromagnetic techniques applied to an archaeological framework reconstructed in laboratory, Advanced Ground Penetrating Radar (IWAGPR), 2015 8th International Workshop on Advanced Ground Penetrating Radar, IEEE, 7-10 July 2015 Firenze Colombero C., Comina C., Gianotti F. and Sambuelli L. 2014. Waterborne and on-land electrical surveys to suggest the geological evolution of a glacial lake in NW Italy. Journal of Applied Geophysics 105, 191–202 Morelli G., LaBrecque D.J., 1996, Advances in ERT inverse modeling. European Journal of Environmental and Engineering Geophysics, 1, 171-186 Passaro S. 2010. Marine electrical resistivity tomography for shipwreck detection in very shallow water: a case study from Agropoli (Salerno, southern Italy). Journal of Archaeological Science 37, 1989–1998 Perciante F., Capozzoli L., CaputiA., DeMartino G., GiampaoloV., Luongo R., Rizzo E., Geophysical investigation for an analogue labscale archaeological site 1st International Conference on Metrology for Archaeology Benevento, Italy, October 22-23, 2015 Rucker D.F., Noonan G.E. and Greenwood W.J.W. 2011. Electrical resistivity in support of geological mapping along the Panama Canal. Engineering Geology 117, 121–133 Simyrdanis K., Papadopoulos N. Kim J.-H. and Tsourlos P.I., 2015, Archaeological investigations in the shallow seawater environment with electrical resistivity tomography, Near Surface Geophysics, 2015, 13,601-611 DOI: 10.3997/1873-0604.2015045. Fig. 3 – 2D ERT (Wenner-Schlumberger) acquired in the presence of graves with floating electrodes in array.