Permafrost Change Under Natural Sites Along the Qinghai-Tibet Railway During the Years of 2006-2015
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
Received date: 2017-12-11
Revised date: 2018-02-06
Online published: 2018-05-02
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).
Copyright
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.
Key words： Permafrost; Permafrost table; Ground temperature; Permafrost change.
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 . DOI: 10.11867/j.issn.1001-8166.2018.03.0248
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