Near-field Ground-penetrating Radar Modeling for Characterization of a Reference Water Layer at Low Frequencies
(2013) Near Surface Geoscience 2013 — Location: Bochum (Germany) (9.September.2013)
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- Abstract
- In this research, full-wave modeling of near-field ground-penetrating radar (GPR) data is used for reconstructing the electrical properties of a reference water layer. Based on the three-dimensional multilayered media Green's functions from the near-field model, several numerical experiments were conducted to simultaneously retrieve the water electrical conductivities, water thickness and antenna heights at relatively low frequencies (i.e., 10-710 MHz). We calibrated a homemade bowtie antenna using measurements collected at different heights over a water layer of known electrical conductivity. Once the global transmission and reflection coefficients of the antenna were known, synthetic radar data could be simulated to test the well-posedness of the inverse problem. The GPR model was then validated for measurements collected over water subject to a range of electrical conductivities. A good agreement was obtained between the radar data and the full-wave electromagnetic model and the water layer properties were accurately retrieved. Yet, some discrepancies were observed between the inversely estimated and measured water electrical conductivities. This was attributed to a lower sensitivity of the model to electrical conductivity for this particular setup. The proposed methods present promising perspectives for digital soil mapping.
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Mourmeaux, N., Tran, V. A., André, F., & Lambot, S. (2013). Near-field Ground-penetrating Radar Modeling for Characterization of a Reference Water Layer at Low Frequencies. EarthDoc, p. WeP01. https://doi.org/10.3997/2214-4609.20131386