Experimental Ground Penetrating Radar survey on the frozen Soyang Lake

Abstract

To understand characteristics of Ground Penetrating Radar antenna for studying lacustrine sediments, experimental data were recorded on the frozen Soyang Lake using three antennas with center frequencies of 50, 100, and 250 MHz. For the three center frequencies, the vertical resolution of reflected signals is 0.17, 0.08, and 0.03 m at the lake bottom and 0.30, 0.15, and 0.06 m in the bottom sediments, respectively. The corresponding radii of the first Fresnel zone are computed to be 1.30, 0.91, and 0.58 m at the lake bottom. The attenuation factors and bulk conductivity for the water are obtained as 1.04, 1.17, and 1.19 dB/m and 0.049, 0.056, and 0.057 S/m, respectively. Such low conductivities indicate that the water is fresh and clean. The penetration depths into the bottom sediments are approximately 5.11 and 3.36 m for 50 and 100 MHz antennas, respectively.