GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 3.2 ___ GNGTS 2023 Figure 3. A) Electrodes placed between boulders using sponges soaked with saltwater to improve the galvanic contact; B) 10 bins of 120 liters each used to store the water for the infiltration experiment. The bins were placed on the rock glacier in early spring 2022 and filled with snow. Moreover, the bins were covered with nylon sheets pierced at their center to collect also the rainwater; C) Injection of about 800 liters of salt water into the frozen subsoil system during the infiltration experiment performed in mid-June 2022. During the 41st National Conference of the GNGTS 2023 in Bologna, we will present the result of the infiltration experiment combined with ERT time-lapse measurements, which confirmed the assumption that a continuous frozen layer can act as an aquiclude or aquitard in a mountain permafrost subsoil (Pavoni et al., 2022b). A future development of this geophysical monitoring method applied in rock glacier environments, is to appropriately optimize the execution of the experiment to evaluate, in a quantitative way, the hydraulic conductivity of the active layer. References Binley, A; 2015: Tools and Techniques: Electrical Methods. In: Gerald Schubert (editor-in chief), Treatise on Geophysics, 2nd edition, Vol 11. Oxford: Elsevier; p. 233-259, https://doi.org/10.1016/B978-0-444-53802-4.00192-5. Brighenti S., Engel M., Tolotti M. Bruno M.C., Wharton G., Comiti F., Tirler W., Cerasino L., and Bertoldi W.; 2021: Contrasting physical and chemical conditions of two rock glacier springs. Hydrological Processes, 35(4), https://doi.org/10.1002/hyp.14159. Carturan L., Zuecco g., Seppi R., Zanoner T., Borga M., Carton A., and Dalla Fontana D.; 2016: Catchment scale permafrost mapping using spring water characteristics. Permafrost and Periglacial Process., 27, 253-270, https://doi.org/10.1002/ppp.1875. Giardino, J. R., Vitek, J. D., and Demorett, J. L.; 1992: A model of water movement in rock glaciers and associated water characteristics. In Periglacial Geomorphology: Proceedings of the 22nd Annual Binghampton Symposium in Geomorphology, pp. 159–184. Harrington, J. S., Mozil, A., Hayashi, M., and Bentley, L. R.; 2018: Groundwater flow and storage processes in an inactive rock glacier. Hydrological Processes, 32(20), 3070-3088, https://doi.org/10.1002/hyp.13248. Hauck, C., and Kneisel, C.; 2008: Applied Geophysics in Periglacial Environments, Cambridge University Press. Janke, J.R., Regmi, N.R., Giardino, J.R., and Vitek, J. D.; 2013: Rock Glaciers. In Treatise on Geomorphology; Elsevier Inc., Ed.; Elsevier Inc.: Amsterdam, The Netherlands, 2013; pp. 238–273.