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- W4224982015 abstract "Abstract Imaging subsurface small‐scale features and monitoring transport of tracer plumes at a fine resolution is of interest to characterize transport processes in aquifers. Full‐waveform inversion (FWI) of crosshole ground penetrating radar (GPR) measurements enables aquifer characterization at decimeter‐scale resolution. The method produces images of both relative dielectric permittivity ( ε r ) and bulk electrical conductivity ( σ b ) that can be related to hydraulic aquifer properties and tracer distributions. To test the potential of time‐lapse GPR FWI for imaging tracer plumes, we conducted a numerical tracer experiment by injecting saline water, desalinated water, and ethanol in a heterogeneous aquifer. The saline and desalinated tracers only changed σ b , whereas ethanol changed both ε r and σ b . Tracer concentrations were retrieved from the inverted ε r and σ b models using information about petrophysical parameters. GPR FWI ε r and σ b tracer images could recover preferential paths of ∼0.2 m width, while the derived σ b structures are smoother. FWI of 50 time‐lapse data sets demonstrated the potential of the FWI to derive spatially resolved breakthrough curves of the saline and ethanol tracer in the image plane between the boreholes. Thus, high‐resolution imaging with GPR FWI of tracers that produce a high permittivity contrast against the background has a great potential for characterization of heterogeneous transport in aquifers." @default.
- W4224982015 created "2022-04-28" @default.
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- W4224982015 date "2022-05-01" @default.
- W4224982015 modified "2023-10-18" @default.
- W4224982015 title "Detection of Tracer Plumes Using Full‐Waveform Inversion of Time‐Lapse Ground Penetrating Radar Data: A Numerical Study in a High‐Resolution Aquifer Model" @default.
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- W4224982015 doi "https://doi.org/10.1029/2021wr030110" @default.
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