Field GPR Monitoring of Biostimulation in Saturated Porous Media

Field GPR Monitoring of Biostimulation in Saturated Porous Media

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  • November 20, 2018
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Time-lapse borehole radar was used to monitor a sandy aquifer with dielectric property changes hypothesized to result from biomass growth and biodegradation of hydrocarbons. A blend of gasoline and ethanol was released below the water table at Canadian Forces Base (CFB) Borden, Canada, and a source of oxygen was used for cyclic stimulation of microbial activity over a period of two years. A dense grid of fourteen borehole ground-penetrating radar (GPR) pairs monitoring the bioactive region showed 200 MHz radar wave velocity changes of ± 4% and signal attenuation changes of ± 25%during three cycles of variable biostimulation. GPR signal changes correlated spatially and temporally to independent measurements of groundwater velocity flow changes and geochemical variations that occurred in response to microbial activity. Greater relative changes in radar wave velocity of propagation were …

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