High‐Resolution Geological Information from Crosshole Ground Penetrating Radar in Clayey Tills

Heterogeneous glacial deposits dominate large parts of the Northern Hemisphere. In these landscapes, high-resolution characterization geology is crucial for understanding contaminant transport. Geological information mostly obtained from multiple boreholes drilled during a site investigation, but such point-based data alone do not always provide required resolution to map small-scale heterogeneity between boreholes. Crosshole ground penetrating radar (GPR) suggested as tool adding credible geological at contaminated investigations in industrial sites where infrastructure, electrical installations, can pose challenge other geophysical methods. GPR are sensitive dielectric permittivity and bulk conductivity, which be related distribution water content sand/clay occurrences. Here we present detailed crosshole dataset collected an clay till setting. The processed using novel inversion approach on changes velocity attenuation signal independently. results compared borehole logs, grain size analyses, relative permeability site. analysis provided valuable lateral variability. A silt layer with thickness few decimeters, likely important flow characterization, was confirmed resolved by data. Our findings suggest that has potential contributing filling gap boreholes, thereby becoming relevant investigations.