Georadar is a geophysical method used to explore natural and artificial structures and has no negative impact on the environment. The method is based on emitting pulses of electromagnetic waves into the ground with a transmitting antenna. Waves deflect from different structures or geological boundaries and return to the surface where they are detected by the receiving antenna. Measurements are recorded on the control unit - a computer in form of a radargram. Field measurements in Renkovci were carried out with equipment designed by manufacturer Mala GS, which consists of a ProEx control unit, a backpack, an unshielded 50 MHz RTA antenna, a shielded 250 MHz antenna, a computer, a network cable, a hip-chain distance meter and a measuring wheel. Manual GPS was used to determine the start and end point of each profile. Renkovci are located in the area of Mursko and Ravensko fields, where layer of clay with pebbles is found on the surface, and covers up to 40 m thick layer of gravelly sand sediments. Radargrams obtained from field measurements were processed in program called ReflexW. We successfully determined groundwater level, from the results of measurements with a 250 MHz RTA antenna. The results were compared with the results of the measurements of Marjana Zajc in Zgornja Radovna, which also successfully determined groundwater level with a 50 MHz antenna.
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