利用地表探地雷达监测土壤入渗估算饱和导水率
Estimating Saturated Hydraulic Conductivity from Surface Ground-Penetrating Radar Monitoring of Infiltration
摘要：
在这项研究中，我们使用Hydrus-1D模拟水分入渗从环入渗仪。我们生成的含水量配置文件在每个时间步的渗透，基于一个特定的值的饱和导水率，同时知道其他的van Escherichten参数。使用复折射率法关系将含水量曲线转换为介电常数曲线。然后，我们使用GprMax程序套件生成雷达图，并使用探地雷达（GPR）记录的电磁波的到达时间来跟踪湿润锋。理论上，在任何入渗时间步模拟的含水量剖面的拐点深度与雷达图中相应道记录的反射振幅峰值有关。我们用这个关系来反演饱和导水率恒定和下降头入渗。我们提出了我们的方法合成的例子和两个实验进行了砂。进一步讨论了除饱和导水率外，还可估算其它两个van Schlichten参数n和α的可能性。
英文摘要：
In this study we used Hydrus-1D to simulate water infiltration from a ring infiltrometer. We generated water content profiles at each time step of infiltration, based on a particular value of the saturated hydraulic conductivity while knowing the other van Genuchten parameters. Water content profiles were converted to dielectric permittivity profiles using the Complex Refractive Index Method relation. We then used the GprMax suite of programs to generate radargrams and to follow the wetting front using arrival time of electromagnetic waves recorded by a Ground-Penetrating Radar (GPR). Theoretically, the depth of the inflection point of the water content profile simulated at any infiltration time step is related to the peak of the reflected amplitude recorded in the corresponding trace in the radargram. We used this relationship to invert the saturated hydraulic conductivity for constant and falling head infiltrations. We present our method on synthetic examples and on two experiments carried out on sand. We further discuss the possibility of estimating two other van Genuchten parameters, n and α, in addition to the saturated hydraulic conductivity.
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