Monitoring surface deformation of permafrost in Wudaoliang Region, Qinghai–Tibet Plateau with ENVISAT ASAR data

• DOI: 10.1016/j.jag.2021.102527
• Publication Date: 2021-09-14T05:00:41Z
• Authors: Rongxing Li; Zhenshi Li; Jiangping Han; Ping Lu; Gang Qiao; Xianglian Meng; Tong Hao; Fujun Zhou
• Keywords: Deformation monitoring

Permafrost in Qinghai–Tibet Plateau (QTP) has been suffering from global warming recent years, characterized by the deepening of permafrost active layer. Seasonal changes are usually reflected as ground surface deformation, which can be monitored multi-temporal interferometric synthetic aperture radar (MT-InSAR) technology. Owing to extreme environment QTP, there few ground-based deformational observation data available, and records monitoring MT-InSAR with validation limited. Here we present a study deformation for technology validated large number in-situ observations compared previous published results. In this study, small baseline subset (SBAS) method was used ENVISAT ASAR WuDaoLiang, acquire analyze corresponding characteristics. The results were first 24 GNSS leveling points along Railway, including numeric (e.g., statistics KS test) between InSAR derived time-interpolated values, variation trend two sequences during period, at each point. Considering both differences magnitudes trends, 22 out detected corresponded well series over one year, indicates reliability monitoring. After validation, amplitudes linear velocity region calculated analyzed, together selected different types terrain. Generally, map, most pixels show periodic seasonal displacement, uplift winter subsidence summer, 3–10 mm regions. mountain areas is less than that flat lands amplitude, shows more randomness Meanwhile, some obvious settlement have detected, probably degradation.