Continuous and simultaneous measurement of reflector depth and average soil-water content with multichannel ground-penetrating radar
Continuous and simultaneous measurement of reflector depth and average soil-water content with multichannel ground-penetrating radar
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DOI：
10.1190/1.2943669
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发表时间：
2008-06
期刊：
影响因子：
3.3
通讯作者：
H. Gerhards;U. Wollschläger;Qihao Yu;P. Schiwek;Xicai Pan;K. Roth
中科院分区：
文献类型：
--
作者：
H. Gerhards;U. Wollschläger;Qihao Yu;P. Schiwek;Xicai Pan;K. Roth
探地雷达是一种快速、无创的监测地下结构和含水率分布的技术。为了从单个共偏置测量中解释走时信息，通常需要额外的假设，例如常数介电常数。我们提出了一种快速探地雷达测量技术，利用多发射机和接收机装置同时测量反射器深度和平均土壤含水量。它可以被认为是一个移动的最小共中点测量。为了进行简单的分析，我们使用了一个简单的评估程序，其中包括从不同天线距离获得的到同一反射器的两个旅行时间。为了获得更精确的方法，增加了一个反向评估程序，使用从一个位置及其邻近测量位置的所有天线分离获得的旅行时间。通过对反射面深度横向变化的综合数据集和土壤含水量变化较大的实验实例的评价，证明了该方法在野外尺度测量中的适用性。该应用程序的关键点是获得绝对旅行时间，这很难从普通偏移量测量中准确确定。
Ground-penetrating radar is a fast noninvasive technique that can monitor subsurface structure and water-content distribution. To interpret traveltime information from single common-offset measurements, additional assumptions, such as constant permittivity, usually are required. We present a fast ground-penetrating-radar measurement technique using a multiple transmitter-and-receiver setup to measure simultaneously the reflector depth and average soil-water content. It can be considered a moving minicommon-midpoint measurement. For a simple analysis, we use a straightforward evaluation procedure that includes two traveltimes to the same reflector, obtained from different antenna separations. For a more accurate approach, an inverse evaluation procedure is added, using traveltimes obtained from all antenna separations at one position and its neighboring measurement locations. The evaluation of a synthetic data set with a lateral variability in reflector depth and an experimental example with a large variability in soil-water content are introduced to demonstrate the applicability for field-scale measurements. The crucial point for this application is the access to absolute traveltimes, which are difficult to determine accurately from common-offset measurements.