GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 3.2 ___ GNGTS 2023 ERT, TDIP and MASW measurements were focused on a single line (L3, Fig. 1b), where we can also log groundwater level and salinity in an adjacent well (P1 in Fig. 1b). The near-surface geology can be summarized in a four-layer model: a shallow layer (thickness from 1 to 4 m) of silt, peat and peaty clay, with lateral transitions to beach sand; an intermediate relatively thin (2-4 m) layer of sandy silt and then a third layer of sand down to a depth of about 35-40, where there is the transition to the marine clays. Figure 1. (a) Study area at the Circeo National Park (LT), (b) Detailed view of the investigated line and its elevation profile, (c) ERT/TDIP data acquisition, (d) MASW data acquisition. The ERT and TDIP data were acquired using the Syscal Pro resistivity meter (IRIS Instruments) with 48 stainless steel electrodes spaced 3 m apart, using the multiple gradient (MG) array. The