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基于瞬变电磁法(TEM)的西昆仑地区多年冻土厚度探测与研究
引用本文:刘广岳,王武,赵林,陈继,庞强强,王志伟,杜二计.基于瞬变电磁法(TEM)的西昆仑地区多年冻土厚度探测与研究[J].冰川冻土,2015,37(1):38-48.
作者姓名:刘广岳  王武  赵林  陈继  庞强强  王志伟  杜二计
作者单位:中国科学院寒区旱区环境与工程研究所青藏高原冰冻圈观测研究站,甘肃兰州730000;中国科学院寒区旱区环境与工程研究所冰冻圈科学国家重点实验室,甘肃兰州730000;中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,甘肃 兰州,730000
基金项目:国家自然科学基金项目(41401086); 中国科学院寒区旱区环境与工程研究所青年人才成长基金项目(51Y184C41); 国家科技基础性工作专项项目(2008FY110200)资助
摘    要:多年冻土厚度对于多年冻土的区域分布和环境效应具有重要控制和指示意义.应用瞬变电磁法(TEM)对青藏高原西昆仑地区的多年冻土下限进行了探测,并结合钻孔资料分析了该研究区域多年冻土厚度的分布特征.结果表明:研究区域多年冻土厚度随地形、地质条件的差异表现出显著的空间差异性.沿着219国道从509道班到奇台达坂的高山峡谷区,随着海拔的升高,多年冻土从无到有,而且,TEM探测到的多年冻土厚度从不到10 m到接近100 m,平均厚度约为55 m;自界山达坂向东到拉竹龙的低山丘陵区,除部分区域发育融区外,多年冻土厚度一般在50 m左右,TEM探测显示多年冻土平均厚度约为58 m;进入甜水海盆地,多年冻土厚度普遍超过60 m,TEM探测到靠近湖泊的盆地中心地带多年冻土平均厚度可达110 m.多年冻土厚度随地温的降低呈显著的线性增加趋势,10 m深度地温平均每降低1℃,多年冻土厚度增加29 m.多年冻土的厚度随海拔的升高显著增加,同时局地因素对多年冻土的发育有显著影响,其内在机制需要进一步研究.

关 键 词:瞬变电磁法  多年冻土厚度  多年冻土下限  西昆仑
收稿时间:2014-07-11

Using transient electromagnetic method to sound permafrost depth in the West Kunlun Mountains
LIU Guangyue,WANG Wu,ZHAO Lin,CHEN Ji,PANG Qiangqiang,WANG Zhiwei,DU Erji.Using transient electromagnetic method to sound permafrost depth in the West Kunlun Mountains[J].Journal of Glaciology and Geocryology,2015,37(1):38-48.
Authors:LIU Guangyue  WANG Wu  ZHAO Lin  CHEN Ji  PANG Qiangqiang  WANG Zhiwei  DU Erji
Affiliation:LIU Guangyue;WANG Wu;ZHAO Lin;CHEN Ji;PANG Qiangqiang;WANG Zhiwei;DU Erji;Cryosphere Research Station on Qinghai-Xizang Plateau,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences;State Key Laboratory of Cryospheric Sciences,Cold and Arid Regions Environmental and Engineering Research Institute ,Chinese Academy of Sciences;State Key Laboratory of Frozen Soil Engineering,Cold and Arid Regions Environmental and Engineering Research Institute ,Chinese Academy of Sciences;
Abstract:Based on the Project of Permafrost Investigation in the Tibetan Plateau, permafrost base was sounded by using transient electromagnetic method (TEM), in typical areas of west Kunlun Mountains. It is found that using TEM to obtain the permafrost base is effective in frozen loose sediments. In the study area, distribution of permafrost is significantly characterized by spatial differential due to different in regional climate and geological conditions. The average depth of permafrost is approximately 55 m in alpine valley areas and 58 m in low mountains and hilly areas according to TEM sound. The permafrost depth widely reaches above 60 m in Tianshuihai basin. In the heartland of the basin (near modern lake), the maximum average depth of approximately 110 m was sounded by TEM. The depth of permafrost linearly increases with decreasing ground temperature. It is estimated that the permafrost depth will increase 29 m as ground temperature at 10 m deep decreasing 1 ℃. In general, permafrost depth increases with altitude. However, local factors have an important impact on the development and distribution of permafrost sometimes. Further research on the impact mechanisms of local factors is necessary for improving the survey accuracy.
Keywords:transient electromagnetic method (TEM)  permafrost depth  permafrost base  West Kulun Mountains
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