Description: To increase the resolution of crosshole ground-penetrating radar (GPR) tomography, a wide-range of ray-path angles are required including transmitter-receiver pairs that produce large angles. However, artefacts have been observed in the inverted GPR tomograms when high-angle data were incorporated in ray-base tomography and inversions. Therefore, it is common practice to limit the angular aperture to a particular threshold ranging between 30° to 50° for ray-based inversion which significantly reduces the spatial resolution. Detailed 3D modeling of the crosshole GPR waves including the water-filled borehole and finite length antenna showed that this phenomenon is caused by the strong refraction of the electromagnetic waves at the borehole interface between water and soil due to change in the electromagnetic waves velocities. Our novel correction method can be used by crosshole GPR user to incorporate wide-angle ray-paths and improved apparent velocity values to obtain more accurate and higher resolution tomographic inversion results.
Global identifier:
Uuid(
3488bdeb-b3bd-49ce-83af-ffcdacbf6b89,
)
Origin: /Wissenschaft/Helmholtz-Gemeinschaft/Forschungszentrum Jülich/TERENO Geoportal
Tags: Radar ? Bodenwasser ? Daten ? Inversionswetterlage ? Punktquelle ? Modellierung ? Schwellenwert ? GPR, crosshole,ray-based,inversion ? hiac ?
Bounding boxes: 5.869443° .. 15.03805° x 47.281101° .. 54.9174°
License: unbekannt
Language: unbekannt
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