The use of GPR to detect active layers in young periglacial terrain of Livingston Island, Maritime Antarctica
The use of GPR to detect active layers in young periglacial terrain of Livingston Island, Maritime Antarctica
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DOI：
10.3997/1873-0604.2008008
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发表时间：
2008-10
影响因子：
1.6
通讯作者：
G. Schwamborn;D. Wagner;H. Hubberten
中科院分区：
文献类型：
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作者：
G. Schwamborn;D. Wagner;H. Hubberten
南设得兰群岛提供了无冰的边缘，其冰缘表面在最近的冰川退缩后只有几十年的历史。探地雷达（GPR）剖面被用来获取信息的年轻的冻土发生推断活动层的进步。当地探地雷达测量包括平行单偏移距二维反射剖面网格和多偏移距测量，以确定地面波速。解释用于确定沉积物成分和支持GPR剖面解释。探地雷达结果表明，在海拔140米的火山岩土壤中，可以很容易地追踪到活动层。与此相反，探地雷达数据是模糊的，在一个网站的海拔低（35米asl），冻结和未冻结的地面成像紧挨着对方和探地雷达的解释依赖于地面验证。
The South Shetland Islands offer ice-free margins with periglacial surfaces that are only a few decades old after the recent glacier retreat. Ground-penetrating radar (GPR) profiling was used to acquire information on young permafrost occurrence as deduced from active layer advance. Local GPR measurements included grids of parallel single-offset 2D reflection profiles and multi-offset measurements to determine wave velocity in the ground. Excavations served to determine the sedimentary composition and to backup GPR profile interpretation. GPR results show that the active layer could easily be traced at a site 140 m above sea level (asl), which is placed in volcanic soil. In contrast, GPR data were ambiguous at a site low in altitude (35 m asl), where frozen and unfrozen ground was imaged next to each other and GPR interpretation relied on ground verification.