Permafrost deformation in Qinghai-Tibet Plateau time-series PS-InSAR

doi:10.13474/j.cnki.11-2246.2021.0007

Abstract

Abstract: The permafrost and the active layer variations are closely related to global climate change and biodiversity. However, the traditional measurements of the permafrost are usually restricted within regionally specific sites and the spatial coverage is limited. In this paper, the C-band Sentinel-1A IW model data with small baseline SAR interferometry (SBAS) technique considering permanent scatterers is used to study the surface deformation and frost-thawing in the Tuotuohe permafrost region of Qinghai-Tibet Plateau. The estimated surface displacement rate (mainly ranging from -20 to 20 mm/a) and displacement time series reflected the evolution of permafrost and active layer. In addition, the results are consistent with the leveling data, and furthermore this method is better than the general multi-temporal InSAR method. In addition, the relationship between SAR imaging geometry and surface displacement is analyzed and the motion trend is better explained, especially for slopes. The results show the monitoring ability of InSAR, which improves our understanding of the surface deformation in permafrost area.

Key words: permafrost, Qinghai-Tibet Plateau, synthetic aperture radar interferometry (InSAR), small baseline subset (SBAS), surface displacement time series

CLC Number:

HONG Zhaoyang, JIN Shuanggen. Permafrost deformation in Qinghai-Tibet Plateau time-series PS-InSAR[J]. Bulletin of Surveying and Mapping, 2021, 0(1): 35-40.

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