Quantitative high-resolution observations of soil water dynamics in a complicated architecture using time-lapse ground-penetrating radar
Quantitative high-resolution observations of soil water dynamics in a complicated architecture using time-lapse ground-penetrating radar
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DOI：
10.5194/hess-19-1125-2015
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发表时间：
2014-11
影响因子：
6.3
通讯作者：
P. Klenk;S. Jaumann;K. Roth
中科院分区：
文献类型：
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作者：
P. Klenk;S. Jaumann;K. Roth
利用高分辨率时移探地雷达（GPR）对地下水位推进和后退进行观测，可以获得丰富的近地表水含量动态信息。在本研究中，我们介绍并分析了在我们的人工评估试验场进行的一系列渗吸、排水和渗透实验，并使用基于地面的探地雷达进行观察。该试验场具有复杂但已知的地下结构，由三种不同的沙子构成。它允许用探地雷达在广泛的不同条件下研究土壤水动力学。在这里，我们特别评估了(i)监测毛细条纹反射动态形状的可行性和（ii）通过评估底部反射在整个垂直范围内平均监测土壤水动力学的相对精度。从土壤物理的角度出发，研究了动态变化毛细条纹探地雷达响应的现象学。然后，我们根据含水量动态和预期探地雷达响应的数值模拟解释了实验观察到的现象。
High-resolution time-lapse ground-penetrating radar (GPR) observations of advancing and retreating water tables can yield a wealth of information about near-surface water content dynamics. In this study, we present and analyze a series of imbibition, drainage and infiltration experiments that have been carried out at our artificial ASSESS test site and observed with surface-based GPR. The test site features a complicated but known subsurface architecture constructed with three different kinds of sand. It allows the study of soil water dynamics with GPR under a wide range of different conditions. Here, we assess in particular (i) the feasibility of monitoring the dynamic shape of the capillary fringe reflection and (ii) the relative precision of monitoring soil water dynamics averaged over the whole vertical extent by evaluating the bottom reflection. The phenomenology of the GPR response of a dynamically changing capillary fringe is developed from a soil physical point of view. We then explain experimentally observed phenomena based on numerical simulations of both the water content dynamics and the expected GPR response.