作者简介:孙志忠(1974-),男,辽宁清原人,副研究员,主要从事寒区环境与冻土工程研究.E-mail:sun@lzb.ac.cn
收稿日期: 2017-12-11
修回日期: 2018-02-06
网络出版日期: 2018-05-02
基金资助
*国家自然科学基金面上项目“青藏高原多年冻土区路基下融化夹层水热过程观测与模拟研究”(编号:41571064);国家自然科学基金重点项目“青藏高速公路修筑对冻土工程走廊的热影响及环境效应”(编号:41630636)资助.
版权
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
基于青藏铁路沿线30个天然场地2006—2015年地温观测资料,对多年冻土天然上限(以下称冻土上限)及其变化、不同深度冻土地温及其变化进行分析,研究了近期多年冻土时空变化特征。观测结果表明,冻土上限为0.88~9.14 m,平均为3.54 m。在冻土上限下降的场地中,冻土上限下降幅度为0.05~2.22 m,平均为0.51 m;冻土上限下降速率为0.01~0.25 m/a,平均为0.07 m/a。高温冻土区冻土上限下降幅度与下降速率分别大于低温冻土区的0.47 m与0.06 m/a。总体而言,冻土上限附近和15 m深度地温呈上升趋势。其中,冻土上限附近地温升温幅度为0.01~0.60 ℃,平均为0.16 ℃;冻土上限附近地温升温速率为0.001~0.067 ℃/a,平均为0.018 ℃/a。低温冻土区上限附近地温升温幅度与升温速率分别大于高温冻土区0.12 ℃和0.014 ℃/a。15 m深度地温升温幅度为0.01 ~0.48 ℃,平均为0.10 ℃,15 m深度地温升温速率为0.002~0.054 ℃/a,平均为0.011 ℃/a。低温冻土区15 m深度地温升温幅度和升温速率分别大于高温冻土区0.11 ℃和0.012 ℃/a。个别观测场地受局地因素影响,出现了冻土上限抬升和冻土地温下降的情形。
孙志忠 , 马巍 , 穆彦虎 , 刘永智 , 张淑娟 , 王宏磊 . 青藏铁路沿线天然场地多年冻土变化[J]. 地球科学进展, 2018 , 33(3) : 248 -256 . DOI: 10.11867/j.issn.1001-8166.2018.03.0248
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.
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