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Ground Penetrating Radar Imaging of a Circular Patterned Ground near King Sejong Station, Antarctica

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Ground Penetrating Radar Imaging of a Circular Patterned Ground near King Sejong Station, Antarctica
Other Titles
GPR을 이용한 남극 세종과학기지 주변 원형구조토 연구
Kim, KwanSoo
Ju, Hyeontae
Lee, Joohan
Chung, Changhyun
Kim, Hyoungkwon
Lee, Sunjoong
Kim, Jisoo
patterned groundactive layerground penetrating radar (GPR)common mid-point (CMP)frequency spectrumKing Sejong Station
Issue Date
Kim, KwanSoo, et al. 2021. "Ground Penetrating Radar Imaging of a Circular Patterned Ground near King Sejong Station, Antarctica". The Journal of Engineering Geology, 31(3): 257-267.
Constraints on the structure and composition of the active layer are important for understanding permafrost evolution. Soil convection owing to repeated moisture-induced freeze-thaw cycles within the active layer promotes the formation of self-organized patterned ground. Here we present the results of ground penetrating radar (GPR) surveys across a selected sorted circle near King Sejong Station, Antarctica, to better delineate the active layer and its relation to the observed patterned ground structure. We acquire GPR data in both bistatic mode (common mid-points) for precise velocity constraints and monostatic mode (common-offset) for subsurface imaging. Reflections are derived from the active layer-permafrost boundary, organic layer-weathered soil boundary within the active layer, and frozen rock-fracture-filled ice boundary within the permafrost. The base of the imaged sorted circle possesses a convex-down shape in the central silty zone, which is typical for the pattern associated with convection-like soil motion within the active layer. The boundary between the central fine-silty domain and coarse-grained stone border is effectively identified in a radar amplitude contour at the assumed active layer depth, and is further examined in the frequency spectra of the near- and far-offset traces. The far-offset traces and the traces from the lower frequency components dominant on the far-offset traces would be associated with rapid absorption of higher frequency radiowave due to the voids in gravel-rich zone. The presented correlation strategies for analyzing very shallow, thin-layered GPR reflection data can potentially be applied to the various types of patterned ground, particularly for acquiring time-lapse imaging, when electric resistivity tomography is incorporated into the analysis.
King Sejong Station
Appears in Collections  
2021-2021, The Korean Route Exploration and Technology Development for Antarctic Inland Researches (21-21) / Lee, Khanghyun (PE21080)
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