探地雷达方法测量近地表含水量模拟研究

Measurement of near surface water content using ground-penetrating radar-a simulation study

为了充分地验证探地雷达方法用于探测近地表含水量的有效性和可靠程度,着重分析了探地雷达反射波法用于测量含水量的相关理论和技术特点,设计了适用于高频雷达信号的速度分析算法,建立了用于分析该问题的局部含水层模型.利用FDTD方法模拟分析了局部含水层的探地雷达响应,应用速度分析理论及Topp模型,反演得到了研究区域的含水量结果.

To fully validate the feasibility of the GPR method in the use of measuring near surface water content, the corresponding theory and technical characteristic of GPR reflected wave method are analyzed. A velocity analysis algorithm applied to high frequency radar signal is introduced, and a local aquifer model is established for such analysis. The Finite-Difference Time-Domain （FDTD） method is used to model the GPR response of the local aquifer under different measurement acquisitions. On the combination of the velocity analysis theory and the Topp formula, the water content is obtained by inverse modeling.