GNGTS 2018 - 37° Convegno Nazionale

690 GNGTS 2018 S essione 3.2 Carrivick J. L. and Tweed F. S.; 2013: Proglacial lakes: character, behavior and geological importance, Quaternary Science Review, 78, pp. 34-52. 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, pp. 191-202. Colombo, N., Salerno, F., Gruber, S., Freppaz, M., Williams, M., Fratianni, S., Giardino, M.; 2018a: Review: impacts of permafrost degradation on inorganic chemistry of surface fresh water, Global and Planetary Change, 162, pp. 69-83. Colombo, N., Sambuelli, L., Comina, C., Colombero, C., Giardino, M., Gruber, S., Viviano, G., Vittori Antisari, L., Salerno, F.; 2018b: Mechanisms linking active rock glaciers and impounded surface water formation in high- mountain areas. Earth Surface Processes and Landforms, 43(2), pp. 417-431. Colombo, N., Gruber, S., Martin, M., Malandrino, M., Magnani, A., Godone, D., Freppaz, M., Fratianni, S., Salerno, F.; 2018c: Rainfall as primary driver of discharge and solute export from rock glaciers: The Col d’Olen Rock Glacier in the NW Italian Alps, Science of the Total Environment, 639, pp. 316-330. Hamerlík, L., Svitok, M., Novikmec, M., Očadlík, M., Bitušík, P.; 2014: Local, among-site, and regional diversity patterns of benthic macroinvertebrates in high altitude waterbodies: Do ponds differ from lakes? Hydrobiologia, 723(1), pp. 41-52. Lami, A., Marchetto, A., Musazzi, S., Salerno, F., Tartari, G., Guilizzoni, P., Rogora, M., Tartari, G.A; 2010: Chemical and biological response of two small lakes in the Khumbu Valley, Himalayas (Nepal) to short-term variability and climatic change as detected by long-term monitoring and paleolimnological methods, Hydrobiologia, 648, pp. 189-205. Salerno, F., Gambelli, S., Viviano, G., Thakuri, S., Guyennon, N., D’Agata, C., Diolaiuti, G., Smiraglia, C., Stefani, F., Bocchiola, D., Tartari, G.; 2014: High alpine ponds shift upwards as average temperatures increase: A case study of the Ortles-Cevedale mountain group (Southern Alps, Italy) over the last 50 years, Global and Planetary Change, 120, pp. 81-91. Schrott, L., Sass, O.; 2008: Application of field geophysics in geomorphology: Advances and limitations exemplified by case studies, Geomorphology, 93, pp. 55-73 CORRECTING THE INFLUENCE OF 3D GEOMETRY TO PROCESS 2D ERT MONITORING DATA OF RIVER EMBANKMENTS AT THE LABORATORY SCALE G. Tresoldi 1 , A. Hojat 2,1 , L. Zanzi 1 1 Dipartimento di Ingegneria Civile e Ambientale, Politecnico di Milano, Milano, Italy 2 Department of Mining Engineering, Shahid Bahonar University of Kerman, Kerman, Iran Introduction. The frequent extreme floods occurred in last ten years in Europe have arisen an interest in decreasing hydrogeological risks and assessing the stability of the defense structures. In last years, geophysical methods have been used to assess the stability of embankments. Geo- electrical methods have specifically shown to be very suitable in monitoring the variations of water saturation and detecting inhomogeneous seepage zones in earthen slopes, dams and dikes (Dahlin et al. , 2008; Kuras et al. , 2009; Jomard et al. , 2010; Supper et al. , 2012; Perri et al. , 2014; Loperte et al. , 2016). In 2015, a geo-electrical monitoring system was installed on the earthen levee of an irrigation canal in San Giacomo delle Segnate, Mantua, northern Italy (Arosio et al. , 2017) to monitor the inner condition of the structure in real time. The device is a prototype of resistivity meter installed permanently with two buried cables equipped with 48 stainless-steel plate electrodes, together with a meteorological station. The system is still working, operating remotely and sending the measured resistivity data through an internet connection to provide real-time information about the variations in water saturation and seepage in the levee body based on a defined calibration procedure (Tresoldi et al. , 2018). To study resistivity changes within the structure due to changes in the water level in the channel as well as rainfall events, and to better analyze the monitoring data recorded so far, a small-scale flume was constructed in Applied Geology and Geophysics Laboratory of