Evaluating GroundPenetrating Radar use for water infiltration monitoring

A. Saintenoy, S. Schneider, P. Tucholka
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引用次数: 57

Abstract

Ground-Penetrating Radar (GPR) was used to monitor water infiltration in sand. Water was injected down an 81 cm long tubed hole with a piezometer recording the depth of water and a tap valve used to adjust it to 15 cm ± 2 cm above the bottom of the tube. During the 20 minutes of infiltration two GPR antennas (transmitter and receiver) were recording a trace every second from an offset position on the surface. The signal, enhanced by differential correction allows to trace the evolution of top and bottom limits of the water bulb in space and time. Comparison with hydrodynamic model of the infiltration process proves that the GPR reflections trace the wetting front and not the saturation bulb. An exact, quantified estimation of the evolution of the top border of the wetting zone is provided. For the bottom border, further work on the estimation of the velocity of radar wave in the infiltration bulb will be needed.
评价探地雷达在水入渗监测中的应用
利用探地雷达(GPR)对砂土中的水分入渗进行监测。将水注入一个81厘米长的管孔中,用压力计记录水的深度,并使用一个水龙头阀将其调整到管底上方15厘米±2厘米。在20分钟的渗透过程中,两根探地雷达天线(发射器和接收器)在地面上的偏移位置每秒记录一次痕迹。通过差分校正增强的信号可以跟踪水球在空间和时间上的上限和下限的演变。通过与入渗过程水动力模型的比较,证明探地雷达反射的是湿润锋而不是饱和球。给出了湿润区上边界演变的精确的、量化的估计。对于底边界,还需要进一步对雷达波在渗透球中的速度进行估计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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