Estimation of Soil Hydraulic Parameters in the Field by Integrated Hydrogeophysical Inversion of Time-Lapse Ground-Penetrating Radar Data

摘要: An integrated hydrogeophysical inversion approach was used to remotely infer the unsaturated soil hydraulic parameters from time-lapse ground-penetrating radar (GPR) data collected at a fixed location over bare agricultural field. The GPR model combines full-waveform solution of Maxwell’s equations for three-dimensional wave propagation in planar layered media together with global reflection and transmission functions account antenna its interactions medium. hydrological simulator HYDRUS-1D two layer single- dual-porosity model. coupled hydrodynamic model, such that electrical properties (permitivity conductivity) serve as input become function output (water content), thereby permiting estimation an loop. To monitor water content dynamics, time domain reflectometry (TDR) measurements were performed, whereby only inversion. Significant effects dynamics observed particular precipitation evaporation events clearly visible. dual porosity provided better results compared single describing which is supported by field observations macropores. Furthermore, GPR-derived profiles reconstructed good agreement TDR observations. These suggest proposed method promising non-invasive characterization shallow subsurface monitoring scale.