Ground-Penetrating Radar Method Applied to Hydrogeological Subsurface Characterization

This paper investigates the application of the Ground-Penetrating Radar (GPR) method for hydrogeological characterization of the subsurface, with a focus on investigations conducted at a dimension stone surface quarry in the settlement of Čelina (Republic of Croatia).GPR represents an efficient and non-invasive geophysical technique that enables high-resolution imaging of subsurface structures based on the reflection of electromagnetic waves at the boundaries of layers with contrasting dielectric properties.Data analysis confirmed the presence of active aquifer zones, including surface accumulations and artesian discharges, indicating a pronounced hydrogeological influence on the formation and dynamics of subsurface water flows.GPR profiles revealed changes in lithological composition, the presence of discontinuities, and fault zones that facilitate vertical infiltration and lateral groundwater movement.The results demonstrate the potential of the GPR method for rapid and reliable identification of subsurface watercourses, delineation of lithological unit boundaries, and assessment of hydrogeological conditions at the investigated site.Nevertheless, the interpretation of GPR data requires careful consideration of local geological factors and, in most cases, integration with other geophysical and hydrogeological methods to ensure more reliable conclusions.