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Geophysical investigations were conducted using electrical resistivity tomography (ERT) along planned dykes of the\udHPP Brežice water accumulation basin. The ERT profile is 7.3 km long and is located on the right riverbank of the Sava\udRiver on the Kr{ko-Brežice field (E Slovenia). A purpose of the investigations was to determine a boundary between\udsemipermeable Miocene and permeable Plio-Quaternary (Pl-Q) and Quaternary (Q) sediments for the proper design of\udthe jet grouting sealing curtain, which will prevent lateral outflow of water from the accumulation basin. In this paper we\udpresent processing of the section between 5100 and 6100 m of the profile line. In this section the measurement template\udwas set to 25 depth levels, because a significant increase in a thickness of the Pl-Q sediments was expected. Modelling of\udthe measured apparent electrical resistivity data was carried out with RES2DINV and RESIX 2DI inversion software.\udDifferent inversion parameters were used to create 15 geoelectrical models for each program, which were then compared\udand evaluated based on borehole data and on previous geological investigations of the area. With the final geoelectrical\udmodels it was possible to successfully determine areas of three expected stratigraphic members and limit an electrical\udresistivity range for each one of them. The boundary is well defined between Q and Pl-Q and also between Q and Miocene\udsediments with sharp contrast in electrical resistivity between them. A boundary between Pl-Q and Miocene sediments\udwas not that obvious, but it was possible to determine its shape by the use of different inversion parameters. We propose\uda simplified geological cross section based on the interpreted geoelectrical models and borehole data

Electrical resistivity tomography investigations along the planned dykes of the HPP Brežice water accumulation basin