Analysis of Frozen Ground Displacement Using SAR Interferometry

초록

Regions located in high latitudes or subject to large seasonal temperature variations often experience diverse geotechnical issues such as ground heave due to frost action, settlement caused by thawing, strength degradation from repeated freeze-thaw cycles, and creep deformation under sustained loads. Accurate monitoring of ground displacement is therefore essential for energy exploitation, resource development, and construction activities in such extreme environments. In this study, artificial frozen ground was prepared, and seasonal surface displacements were measured. These measurements were compared with time-series ground displacement derived from Sentinel-1 Synthetic Aperture Radar (SAR) data using the Permanent Scatterer Interferometric SAR (PS-InSAR) technique. The results showed that when the annual maximum-minimum temperature difference reached approximately 40 degrees C, the simulated frozen ground exhibited surface displacements of about 20mm. Furthermore, the InSAR-derived displacements demonstrated high consistency with the field measurements, thereby validating the accuracy of satellite-based SAR interferometric techniques for monitoring frozen ground displacement.

키워드