GNGTS 2021 - Atti del 39° Convegno Nazionale

GNGTS 2021 S essione 3.2 460 Conclusions This work proves that GPR attribute analysis is an extremely useful technique supporting the interpretation of GPR datasets even for glaciological applications. While amplitude-related attributes, both signal and complex, resulted the best solution in order to identify the ice- bedrock contact reflection of EGZ glacier, frequency- and phase-related attributes did not improve the bedrock detection, when it is hidden by diffuse scattering phenomena. Thanks to the calculated attributes, we obtained a detailed reconstruction of the bedrock morphology and the imaging of the internal structures of the glacier, providing also quantitative estimation about the ice volume. Further investigations and analyses will focus on the physical definition of the high scattered area in order to upgrade the estimation of ice volume giving additional glaciological details about the EGZ glacier. References Bælum, K., Benn, D.I., 2011. Thermal structure and drainage system of a small valley glacier (Tellbreen, Svalbard), investigated by ground penetrating radar: the Cryosphere, 5, 139-149. Carturan, L., Baroni, C., et al., 2013. Decay of a long-term monitored glacier: Careser Glacier (Ortles- Cevedale, European Alps). The Cryosphere, 7, 1819-1838. Colombero, C., Comina, C., De Toma, E., Franco, D., GodioA., 2019. Ice Thickness Estimation fromGeophysical Investigations on the Terminal Lobes of Belvedere Glacier (NW Italian Alps). Remote Sensing, 11, 805. Chopra, S., Marfurt, K. J., 2005, Seismic attributes — A historical perspective. Geophysics,70 (5): 3SO–28SO. Forte, E., Pipan, M., Francese, R., Godio, A., 2015, An overview of GPR investigation in the Italian Alps: First Break, 33, 61-67 Forte, E., Santin, I., Colucci, R.R., Dossi, M., Guglielmin, M., Pipan, M., Roncoroni, G., Žebre, M, 2020. GPR data analysis for cold and warm ice detection and characterization in polythermal glaciers, 18th International Conference on Ground Penetrating Radar, Golden, Colorado, 14–19 June 2020. November 2020, 69-72. Fig. 3 - 3D and 2D (on the right corner) bedrock maps. Dotted red lines highlight the main incisions and supposing drainage system below the ice. Yellow arrow marks the bedrock outcrop, see text for further details. This figure modified from Forte et al..