Land surface deformation analysis based on time series InSAR technologies in the Gaizi valley section of China-Pakistan Corridor

doi:10.7523/j.ucas.2020.0046

Abstract

Abstract: Geological disasters occur frequently along the China-Pakistan Corridor, and the monitoring of small surface deformations can help discriminate and analyze the geological disasters in the study area, which is of great significance to the construction of the corridor and the protection of basic engineering facilities along the corridor. Based on a total of 30 Sentinel-1A radar images in the interference wide-range mode acquired from April 5, 2015 to December 9, 2018, the time-series surface deformation extraction of the Gaizi valley section of China-Pakistan Corridor was carried out using PS-InSAR and SBAS-InSAR technologies. The results show that the deformation information obtained by the two methods is rather consistent in the spatial variation trend of deformation rate, and the deformation rate map obtained by the SBAS-InSAR technology is relatively more continuous in spatial distribution. According to the SBAS-InSAR deformation results, during the analysis period, obvious surface deformation occurred in many places in the study area, and the relatively large line-of-sight deformation mainly distributed on the slopes on both sides of the China-Pakistan Highway and on the glacial front area northern to the Bulunkou. Using the extracted time series deformation information and with the help of optical images, the deformation characteristics of typical unstable slopes and glacial movements were analyzed. On unstable slope, the cumulative deformation of PS points on the upper part of the slope can reach -30mm during the monitoring period. In terms of glacier movement, many PS points with large positive and negative deformation values are concentrated on the front edge of the glacier, and the cumulative positive and negative deformations can reach +60 mm and -80 mm. The paper can accumulate preliminary experience for the detection of geological hazard related deformation in the alpine mountain area and benefit for its future applications to the China-Pakistan Corridor.

Key words: PS-InSAR, SBAS-InSAR, surface deformation, China-Pakistan Corridor, geological hazards

CLC Number:

P237

WANG Yuqing, TANG Lingli, WANG Xinhong, ZHOU Zengguang, LI Ziyang, LI Chuanrong. Land surface deformation analysis based on time series InSAR technologies in the Gaizi valley section of China-Pakistan Corridor[J]. Journal of University of Chinese Academy of Sciences, 2022, 39(3): 343-351.

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