| 浅基岩埋深条件下多年冻土的瞬变电磁法探测研究 |
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| 引用本文： | 杨贵前,谢昌卫,王武,杜二计,刘文惠,张钰鑫,倪杰.浅基岩埋深条件下多年冻土的瞬变电磁法探测研究[J].冰川冻土,2019,41(5):1067-1077. |
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| 作者姓名： | 杨贵前 谢昌卫 王武 杜二计 刘文惠 张钰鑫 倪杰 |
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| 作者单位： | 1. 中国科学院 西北生态环境资源研究院 冰冻圈科学国家重点实验室, 甘肃 兰州 730000;2. 中国科学院大学, 北京 100049 |
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| 基金项目： | 美丽中国生态文明建设科技工程专项（XDA23060703）；国家自然科学基金（41671068）；冰冻圈科学国家重点实验室自主课题（SKLCS-ZZ-2019）资助 |
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| 摘 要： | 瞬变电磁法（TEM）在青藏高原、东北等地区的多年冻土调查中取得了较好的应用效果，但局限于松散沉积层较厚情形，在基岩埋深较浅条件下探测多年冻土基本处于空白。兰州马衔山多年冻土具有分布范围小、温度高、基岩埋深浅的特点，是应用TEM探测浅基岩埋藏条件下多年冻土分布的理想地区。以马衔山多年冻土为主要研究对象，以季节冻土为对照研究了瞬变电磁响应特征，结合区域构造特征、地层露头、钻孔岩心、地温监测数据等信息，论证并探讨了TEM应用于浅基岩埋深时对多年冻土的探测效果。结果表明：马衔山多年冻土分布受构造断裂形成的低阻带控制，下部为负温岩层，实际分布面积为0.11 km2；TEM应用于浅基岩埋深的多年冻土勘探时更多的对地下岩层做出响应，可结合地质、地貌、水文、植被等信息，利用多年冻土的特点和电阻率的变化情况来判断多年冻土的分布范围；当基岩埋深特别浅时可以与探地雷达、钻孔等其他手段联合反演，从而准确地识别多年冻土与下伏基岩。
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| 关 键 词： | 基岩 多年冻土 探测 马衔山 瞬变电磁法 |
| 收稿时间： | 2019-06-15 |
| 修稿时间： | 2019-08-22 |
Study on TEM sounding permafrost with shallow bedrock |
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| YANG Guiqian,XIE Changwei,WANG Wu,DU Erji,LIU Wenhui,ZHANG Yuxin,NI Jie.Study on TEM sounding permafrost with shallow bedrock[J].Journal of Glaciology and Geocryology,2019,41(5):1067-1077. |
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| Authors: | YANG Guiqian XIE Changwei WANG Wu DU Erji LIU Wenhui ZHANG Yuxin NI Jie |
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| Institution: | 1. Cryosphere Research Station on the Qinghai-Tibet Plateau, State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;2. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Transient electromagnetic method (TEM) has achieved a good result in permafrost investigation in the Tibetan Plateau and Northeast China, but it is limited to the case of thick sediment layers. It is basically blank to sound permafrost under the condition of shallow bedrock. Maxian Mountain permafrost in Lanzhou has the characteristics of small distribution range, high temperature and shallow bedrock. It is an ideal area for sounding permafrost distribution under shallow bedrock by TEM. In this paper, Maxian Mountain permafrost is taken as the main research object, seasonally frozen ground is taken as the contrast to study the characteristics of transient electromagnetic response. Combined with regional structural characteristics, stratum outcrop, borehole core and geothermal monitoring data, the effect of TEM sounding permafrost in shallow bedrock is demonstrated and discussed. The results show that the distribution of permafrost in the Maxian Mountain is controlled by the low resistance zone formed by tectonic faults, and the lower part is the negative temperature rock 0.11 km2. When TEM is applied to the exploration of permafrost in shallow bedrock, it responds more to the underground rock layer, which can be combined with the information of geology, geomorphology, hydrology and vegetation. The distribution of permafrost can be judged by the characteristics of soil and the variation of resistivity. When the bedrock is very shallow, it can be inverted jointly with ground penetrating radar data, borehole and other means to identify permafrost and underlying bedrock accurately. |
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| Keywords: | shallow bedrock permafrost detection Maxian Mountain transient electromagnetic method (TEM) |
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