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- W2596320199 abstract "To predict the of Earth system dynamics, observations of the vadose zone structure and water content are of vital interest. A suited measurement technique is ground penetrating radar (GPR). In this dissertation, the constructive inversion of surface GPR data is introduced. It relies on a parameterized model of the subsurface structure and distribution of dielectric permittivity. With it, GPR measurements are simulated by numerically solving Maxwell’s equations. After detecting signals in the measured and simulated data, the residuals of the signals’ traveltime and amplitude is iteratively minimized to estimate the subsurface parameters. Then, water content is computed from dielectric permittivity. The method was applied to measurements obtained on a testbed, providing ground-truth data. A comparison with the estimation results showed an agreement for the structure within ±5 cm and for the water content, a difference less than 2 % vol. A further evaluation of field data demonstrated the method’s applicability, when representing structure and permittivity by spline functions. Additionally a time-series was evaluated with assuming a constant structure, which enabled to interpret water dynamics. Besides providing accurate information on water content distribution and subsurface structure, the method allows the future attempt to estimate hydraulic properties." @default.
- W2596320199 created "2017-03-23" @default.
- W2596320199 creator A5079269347 @default.
- W2596320199 date "2012-11-30" @default.
- W2596320199 modified "2023-09-24" @default.
- W2596320199 title "Constructive Inversion of Vadose Zone GPR Observations" @default.
- W2596320199 doi "https://doi.org/10.11588/heidok.00014171" @default.
- W2596320199 hasPublicationYear "2012" @default.
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