Advances in Earth Science ›› 2018, Vol. 33 ›› Issue (3): 248-256. doi: 10.11867/j.issn.1001-8166.2018.03.0248

Special Issue: 青藏高原研究——青藏科考虚拟专刊

• Orginal Article • Previous Articles     Next Articles

Permafrost Change Under Natural Sites Along the Qinghai-Tibet Railway During the Years of 2006-2015

Zhizhong Sun( ), Wei Ma, Yanhu Mu, Yongzhi Liu, Shujuan Zhang, Honglei Wang   

  1. State Key Laboratory of Frozen Soils Engineering,Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences,Lanzhou 730000,China
  • Received:2017-12-11 Revised:2018-02-06 Online:2018-03-20 Published:2018-05-02
  • About author:

    First author:Sun Zhizhong(1974-), male, Qingyuan County, Liaoning Province, Associate professor. Research areas include environment and engineering in cold regions.E-mail:sun@lzb.ac.cn

  • Supported by:
    Project supported by the National Natural Science Foundation of China “Observation and simulation study on water-heat process of thawed interlayer under the embankment in permafrost regions”(No.41571064) and “Thermo-mechanical influences and environmental effects of the Qinghai-Tibet Expressway’s building on the permafrost engineering corridor” (No.41630636).

Zhizhong Sun, Wei Ma, Yanhu Mu, Yongzhi Liu, Shujuan Zhang, Honglei Wang. Permafrost Change Under Natural Sites Along the Qinghai-Tibet Railway During the Years of 2006-2015[J]. Advances in Earth Science, 2018, 33(3): 248-256.

Permafrost changes under natural sites along the Qinghai-Tibet Railway were investigated based on the ground temperature monitored from the year of 2006 to 2015. Among these sites, mean permafrost table was 3.54 m, with a range of 0.88 to 9.14 m. Among the sites with decreasing permafrost table, mean decreasing amplitude of permafrost table was 0.51 m, with a range of 0.05 to 2.22 m; mean decreasing rate of permafrost table was 0.07 m/a, with a range of 0.01 to 0.25 m/a. Decreasing amplitude and decreasing rate of permafrost table in high temperature regions were 0.47 m and 0.06 m/a greater than those in low temperature regions, respectively. In general, ground temperatures at permafrost table and 15 m depth presented rising tendency. Mean rising amplitude of ground temperature at permafrost table was 0.16 ℃, with a range of 0.01 to 0.60 ℃; mean rising rate of ground temperature at permafrost table was 0.018 ℃/a, with a range of 0.001 to 0.067 ℃/a. Rising amplitude and rising rate of ground temperature at permafrost table in low temperature regions were 0.12 ℃ and 0.014 ℃/a greater than those in high temperature regions, respectively. Mean rising amplitude of ground temperature at 15 m depth was 0.10 ℃, with a range of 0.01 to 0.48 ℃; mean rising rate of ground temperature at 15 m depth was 0.011 ℃/a, with a range of 0.002 to 0.054 ℃/a. Rising amplitude and rising rate of ground temperature at 15 m depth in low temperature regions were 0.11 ℃ and 0.012 ℃/a greater than those in high temperature regions, respectively. Due to the effect of local factors, increasing of permafrost table and decreasing of ground temperature were observed under several sites.

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