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In this study we used Hydrus-1D to simulate water infiltration from a ringinfiltrometer. We generated water content profiles at each time step ofinfiltration, based on a particular value of the saturated hydraulicconductivity while knowing the other van Genuchten parameters. Water contentprofiles were converted to dielectric permittivity profiles using the ComplexRefractive Index Method relation. We then used the GprMax suite of programs togenerate radargrams and to follow the wetting front using arrival time ofelectromagnetic waves recorded by a Ground-Penetrating Radar (GPR).Theoretically, the depth of the inflection point of the water content profilesimulated at any infiltration time step is related to the peak of the reflectedamplitude recorded in the corresponding trace in the radargram. We used thisrelationship to invert the saturated hydraulic conductivity for constant andfalling head infiltrations. We present our method on synthetic examples and ontwo experiments carried out on sand. We further discuss the possibility ofestimating two other van Genuchten parameters, n and \alpha, in addition to thesaturated hydraulic conductivity.

Estimating Saturated Hydraulic Conductivity from Surface Ground-Penetrating Radar Monitoring of Infiltration