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https://doi.org/10.5194/nhess-2018-287
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/nhess-2018-287
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 01 Nov 2018

Research article | 01 Nov 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Natural Hazards and Earth System Sciences (NHESS).

InSAR Technique Applied to the Monitoring of the Qinghai-Tibet Railway

Qingyun Zhang1,2, Yongsheng Li2, Jingfa Zhang2, and Yi Luo2 Qingyun Zhang et al.
  • 1Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin, 150080, China
  • 2Key Laboratory of Crustal Dynamics, Institute of Crustal Dynamics, China Earthquake Administration, 100085, Beijing

Abstract. The Qinghai-Tibet Railway is located on the Qinghai-Tibet Plateau and is the highest altitude railway in the world. With the influence of human activities and geological disasters, it is necessary to monitor ground deformation along the Qinghai-Tibet Railway. In this paper, Advanced Synthetic Aperture Radar (ASAR) (T405 and T133) and TerraSAR-X data were used to monitor the Lhasa-Nagqu section of the Qinghai-Tibet Railway from 2003 to 2012. The data period covers the time before and after the railway was open (total of ten years). This study used a new analysis method (the Full Rank Matrix (FRAM) Small Baseline Subset InSAR (SBAS) time-series analysis) to analyze the Qinghai-Tibet Railway. Before the opening of the railway (from 2003 to 2005), the Lhasa-Nagqu road surface deformation was not obvious; in 2007, the railway was completed and opened to traffic, and the settlement of the railway in the district of Damxung was obvious (20mm/yr). After the opening of the railway (from 2008 to 2010), the Damxung area had a significant subsidence area, and the north section of the railway was relatively stable. By analyzing the distribution of geological hazards in the Damxung area, the distribution of the subsidence area was found to coincide with that of the geological hazards, indicating that the occurrence of subsidence in the Damxung area was related to the influence of surrounding geological hazards and faults. Overall, the peripheral surface of the Qinghai-Tibet Railway is relatively stable but still needs to be verified with real-time monitoring to ensure that the safety of the railway is maintained.

Qingyun Zhang et al.
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Short summary
Before the opening of the railway, the deformation of Qinghai-Tibet Railway was very small and considered stable. After opening, the overall stability of the railway section was good. The main deformation areas are concentrated in the areas where railway lines turn and geological disasters are concentrated. In order to ensure the safety of railway operation, it is necessary to carry out long-term time series observation along the Qinghai-Tibet Railway.
Before the opening of the railway, the deformation of Qinghai-Tibet Railway was very small and...
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