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Mapping vertical profile of discontinuous permafrost with ground penetrating radar at Nalaikh depression,Mongolia |
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| Authors: | Tonghua Wu Qinxue Wang Masataka Watanabe Ji Chen Dorjgotov Battogtokh |
| Institution: | (1) Asia Water Environment Section, Asian Environmental Research Group, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba 305-8506, Japan;(2) Cryosphere Research Station on the Qinghai-Tibet Plateau, State Key Laboratory of Cryospheric Science, Chinese Academy of Sciences, 730000 Lanzhou, China;(3) Faculty of Environmental Information, Keio University, 5522 Endo, Fujisawa Kanagawa, 252-8520, Japan;(4) Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, 730000 Lanzhou, China;(5) Institute of Geography, Mongolian Academy of Sciences, Ulaanbaatar, 210620, Mongolia; |
| Abstract: | Ground-penetrating radar (GPR) has become an important geophysical tool which can provide a wealth of interpretive information about the vertical profile of discontinuous permafrost. A GPR investigation was conducted in October 2006 at the Nalaikh site at the southern boundary of the Siberian discontinuous permafrost region in Mongolia. GPR data were collected along four 100-m-long profiles to identify the location of the permafrost body, which included an in situ drilling borehole and analysis of temperature observations and soil water content measurements from boreholes. The GPR interpretation results indicated that the thickness of discontinuous permafrost at the study site was only 1.9–3.0 m and the permafrost is vulnerable to climate change. The soil temperature and soil water content data demonstrate the precision of GPR image interpretation. This case demonstrated that GPR is well suited for mapping the internal structure of discontinuous permafrost with relatively low soil water content. |
| Keywords: | Discontinuous permafrost Ground-penetrating radar Vertical profile Permafrost degradation |
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