Analysis of Frozen Ground Displacement Using SAR Interferometry

Sewon Kim; Hyun-Jun Choi; Hyangsun Han; YoungSeok Kim

doi:10.12814/jkgss.2025.24.3.039

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2025 Vol.24, Issue 3 Preview Page

Research Article

Analysis of Frozen Ground Displacement Using SAR Interferometry SAR 간섭기법을 활용한 동결 지반 변위 분석 연구

30 September 2025. pp. 39-46

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Abstract

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℃, 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.

Keywords

Cold region

Satellite observation

InSAR

Frozen ground behavior

Field monitoring

고위도 지역이나 계절별 온도차가 큰 지역에서는 지반 결빙으로 인한 융기, 동결토 융해에 따른 침하, 반복적인 동결·융해로 인한 강도 저하, 그리고 지속 하중에 따른 크리프 현상 등 다양한 지반 문제가 빈번하게 발생한다. 이러한 극한 환경에서 에너지 및 자원 개발과 건설 활동을 수행하기 위해서는 지반 변위를 정밀하게 모니터링하는 것이 필수적이다. 본 논문에서는 모사된 동결 지반을 대상으로 계절별 지표 변위를 계측하고, 이를 Sentinel-1 위성으로부터 획득한 영상레이더(Synthetic Aperture Radar, SAR) 자료에 고정산란체 간섭 기법(Permanent Scatterer InSAR, PS-InSAR)을 적용하여 산출된 시계열 변위와 비교·분석하였다. 연구 결과, 연간 최대·최소 기온 차가 약 40℃에 이르는 조건에서 모사 지반의 지표 변위는 약 20mm 발생하였으며, 위성 기반 InSAR 분석값과 현장 계측 결과가 높은 상관성을 보였다. 이를 통해 위성 SAR 간섭 기법이 동결 지반 변위 모니터링에서 높은 정확성과 활용 가능성을 갖는다는 점을 확인하였다.

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Information

Publisher :Korean Geosythetics Society
Publisher(Ko) :한국지반신소재학회
Journal Title :Journal of the Korean Geosynthetics Society
Journal Title(Ko) :한국지반신소재학회 논문집
Volume : 24
No :3
Pages :39-46
Received Date : 2025-09-03
Revised Date : 2025-09-23
Accepted Date : 2025-09-24
DOI :https://doi.org/10.12814/jkgss.2025.24.3.039

Journal of the Korean Geosynthetics Society ISSN:2508-2876(Print) 2287-9528(Online) 한국지반신소재학회 논문집

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