GROUND-PENETRATING RADAR SOUNDING OF DEPOSITS WITHIN THE LIMITS OF HIGH-CENTERED POLYGONS IN THE ARCTIC

This article analyses the results of Loza-B georadar sounding of the upper part of the permanently frozen ground section in the area of polygonal microrelief development. These investigations took place on the eastern coast of the Taymyr Peninsula and on the western coast of Kotelny Island (New Siberian Islands). The polygonal microrelief is at the descend stage of development at both sites, so the ground-penetration radar profi les were scanned across the fl at and high-centered central parts of the polygons. The results allowed us to determine some peculiarities of ground-penetration radar profi les for polygons with diff erent types of surfaces, composed mainly of sand-gravel deposits. Typical ground-penetration radar complexes corresponding to the central parts of the polygons and deposits overlapping thawed ice wedges were identifi ed. The possibility of using the spectrum of waveforms to interpret results was shown, velocities of electromagnetic wave propagation in the studied deposits were determined. Ice wedges and pseudomorphs after them were not reliably identifi ed, but areas of their possible location were.