Multi-channel ground-penetrating radar to explore spatial variations in thaw depth and moisture content in the active layer of a permafrost site
Multi-channel ground-penetrating radar to explore spatial variations in thaw depth and moisture content in the active layer of a permafrost site
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DOI：
10.5194/tc-4-269-2010
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发表时间：
2009-11
期刊：
影响因子：
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通讯作者：
U. Wollschläger;H. Gerhards;Qihao Yu;K. Roth
中科院分区：
文献类型：
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作者：
U. Wollschläger;H. Gerhards;Qihao Yu;K. Roth
利用多通道探地雷达（GPR）在青藏高原多年冻土区进行观测，研究了地表性质和土壤质地对活动层夏末融深和土壤平均含水量的影响。测量在约85 × 60 m2的面积上进行，其表面和土壤质地特性范围从中等至粗糙质地的裸土到质地较好的稀疏植被覆盖着细风吹沙的区域，其中包括碎石路的路基。通过调查，可以清楚地区分不同的单位。结果表明：（i）在沙覆盖的植被区以下，解冻深度较浅，平均土壤含水量较低;（ii）沿砾石路，解冻深度中等，平均土壤含水量沿着较高;（iii）裸土地形，解冻深度中等至较深，平均土壤含水量较低至中等。从我们的测量，我们发现在这个网站的永久冻土过程的假设，导致观察到的夏末融化深度和土壤水分条件。这项研究清楚地表明，在这种环境中的表面和表面下的状态变量和过程之间的复杂的相互作用。多通道探地雷达是一种有效地研究这种系统的操作技术，其尺度从几米到几公里不等。
Multi-channel ground-penetrating radar (GPR) was applied at a permafrost site on the Tibetan Plateau to investigate the influence of surface properties and soil texture on the late-summer thaw depth and average soil moisture content of the active layer. Measurements were conducted on an approximately 85 × 60 m2 sized area with surface and soil textural properties that ranged from medium to coarse textured bare soil to finer textured, sparsely vegetated areas covered with fine, wind blown sand, and it included the bed of a gravel road. The survey allowed a clear differentiation of the various units. It showed (i) a shallow thaw depth and low average soil moisture content below the sand-covered, vegetated area, (ii) an intermediate thaw depth and high average soil moisture content along the gravel road, and (iii) an intermediate to deep thaw depth and low to intermediate average soil moisture content in the bare soil terrain. From our measurements, we found hypotheses for the permafrost processes at this site leading to the observed late-summer thaw depth and soil moisture conditions. The study clearly indicates the complicated interactions between surface and subsurface state variables and processes in this environment. Multi-channel GPR is an operational technology to efficiently study such a system at scales varying from a few meters to a few kilometers.