用地面单偏置探地雷达在单环入渗仪中测定饱和导水率
Saturated hydraulic conductivity determined by on ground mono-offset Ground-Penetrating Radar inside a single ring infiltrometer
摘要：
在这项研究中，我们展示了如何使用探地雷达数据获取沿渗透的水在一个单环入渗仪反演饱和导水率。我们使用Hydrus-1D来模拟水分入渗。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，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，反射率与GPR信号之间的一维时间卷积与雷达图中相应道记录的反射振幅的峰值有关。利用该关系式反演了定水头入渗和降水头入渗的饱和导水率。我们提出了我们的方法合成的例子和两个实验进行砂土。我们进一步讨论的不确定性的反演饱和导水率计算由我们的算法从范波希滕参数。
英文摘要：
In this study we show how to use GPR data acquired along the infiltration of water inside a single ring infiltrometer to inverse the saturated hydraulic conductivity. We used Hydrus-1D to simulate the water infiltration. We generated water content profiles at each time step of infiltration, based on a particular value of the saturated hydraulic conductivity, 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 1D time convolution between reflectivity and GPR signal 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 relation ship 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 soil. We further discuss on the uncertainties on the retrieved saturated hydraulic conductivity computed by our algorithm from the van Genuchten parameters.
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