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• W2323920936 abstract "PreviousNext No AccessSEG Technical Program Expanded Abstracts 2013Imaging fracture anisotropic flow channeling using GPR signal amplitude and phaseAuthors: Georgios TsofliasMatthew BakerMatthew BeckerGeorgios TsofliasU of KansasSearch for more papers by this author, Matthew BakerU of KansasSearch for more papers by this author, and Matthew BeckerCalifornia State U at Long BeachSearch for more papers by this authorhttps://doi.org/10.1190/segam2013-1134.1 SectionsSupplemental MaterialAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Flow in fractured rocks is highly heterogeneous and occurs along preferred pathways referred as flow channels. Conventional borehole hydraulic tests do not capture the heterogeneous flow properties of fractured rock. We present a field investigation of ground-penetrating radar (GPR) imaging of anisotropic channeled flow along a discrete fracture. Dipole-flow tests conducted in a five-spot well field allow control over the orientation of the hydraulic gradient. Multi-polarization, 3D GPR imaging is used in time-lapse mode to monitor dipole-flow saline tracer tests. The presence of saline tracer in the fracture results in reflected GPR signal amplitude increase and phase decrease relative to fresh water. Tracer flow channeling is assessed by comparing GPR imaging of the fracture containing fresh water (background) with east-west (E-W) and north-south (N-S) oriented dipole tracer tests. GPR signal amplitude and phase changes reveal that the EW dipole results in a direct and narrow channeled flow field of least resistance between boreholes. The N-S dipole causes a wider surface area of the fracture to be swept by the tracer suggesting poorer hydraulic connection than the E-W path. GPR imaging results of flow channeling are supported by hydraulic tracer tests conducted at the site. This work presents for the first time a) the use of GPR phase for imaging the spatial distribution of saline tracer in a fracture, and b) imaging in the field flow channeling changes in response to hydraulic gradient orientation changes. Permalink: https://doi.org/10.1190/segam2013-1134.1FiguresReferencesRelatedDetailsCited ByMeasurement and simulation of heat exchange in fractured bedrock using inert and thermally degrading tracers3 February 2017 | Water Resources Research, Vol. 53, No. 2 SEG Technical Program Expanded Abstracts 2013ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2013 Pages: 5258 Publisher:Society of Exploration Geophysicists HistoryPublished: 19 Aug 2013 CITATION INFORMATION Georgios Tsoflias, Matthew Baker, and Matthew Becker, (2013), Imaging fracture anisotropic flow channeling using GPR signal amplitude and phase, SEG Technical Program Expanded Abstracts : 4428-4433. https://doi.org/10.1190/segam2013-1134.1 Plain-Language Summary PDF DownloadLoading ..." @default.
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• W2323920936 title "Imaging fracture anisotropic flow channeling using GPR signal amplitude and phase" @default.
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