GEORADAR INVESTIGATIONS OF THE PERETOLCHIN GLACIER (SOUTHERN SIBERIA)
Presented are the results obtained from the radar profiling of the Peretolchin glacier in the Munku-Sardyk mountain range in the south of Siberia (June 2014 and May 2016) using georadar “Oko-2” with the ABDL “Triton” antenna unit operating at the radiation frequency of 50 and 100 MHz. The ice thickness was determined from the profiles and the ice volumes from the cross-sectional areas and distances between profiles. The ice volume was calculated for the body of the Peretolchin glacier to be 0.007 ± 0.0019 km <sup> 3 </sup>. An analytical method was also used to determine the ice volume according to the type and area of glacier. It is established that the correlation between the volume and the area of the glaciers is expressed by a power function V = kS <sup> p </sup>. The mean ice volume, calculated with due regard for different coefficients, was 0.0061 km <sup> 3 </sup>. The GlabTop model that takes into account the cross-sectional form of the glacier was used to infer the ice volume: the mean volume for two cross-sections (para bolic and ellipses) was 0.0073 km <sup> 3 </sup>. It is established that for 110 years since the start of the investigation into the morphology of the Peretolchin glacier, it has increased twice in its length and in area, its volume has decreased by a factor of 3.7, and the lower boundary of the open part of the glacier has risen 184 meters for that time.