Temporal-spatial characteristics of surface velocity of the Gangpu glacier based on OICC-SBAS technology

doi:10.13474/j.cnki.11-2246.2023.0270

Abstract

Abstract: In this paper, we use Sentinel-2 data to extract and analyze time-series surface motion velocities and spatial-temporal variability characteristics of Gangpu Glacier from 2015 to 2022 using optical imagery cross-correlation technology (OICC) and small baseline subset (SBAS). The results show that there are obvious spatial differences in the surface flow velocity of Gangpu Glacier, and the high values of flow velocity are mainly concentrated in the upstream material accumulation area, which has complex deformation characteristics, with the annual maximum flow velocity of 82.5 m/a. The overall fluctuation of the flow velocity in the main body of the glacier is small, mainly between 40 and 50 m/a. In terms of temporal characteristics, the flow velocity of Gangpu Glacier is relatively stable during the study period, with little difference in flow velocity between years. Meanwhile, the final offset directions obtained using the east-west and north-south offsets are consistent with the actual flow direction of the glacier, and the offset errors in the selected stabilization region only account for 0.04% to 0.7% of the maximum flow velocity of the glacier, which confirms the reliability of the results of the glacier time-series surface flow velocity.

Key words: optical imagery cross-correlation, glacial surface velocity, time-series deformation, Gangpu glacier

CLC Number:

P237

OU Haifeng, ZI Chengdai, TENG Xingfa, GUAN Shudan. Temporal-spatial characteristics of surface velocity of the Gangpu glacier based on OICC-SBAS technology[J]. Bulletin of Surveying and Mapping, 2023, 0(9): 87-92.

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