Ground-penetrating radar observations of enhanced biological activity in a sandbox reactor

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Issue Date
2010-07-27Author
Schillig, Peter Curtis
Tsoflias, Georgios P.
Patterson, E. M.
Devlin, John F.
Publisher
Wiley
Type
Article
Article Version
Scholarly/refereed, publisher version
Metadata
Show full item recordAbstract
In this study, we evaluate the use of ground-penetrating radar (GPR) to investigate the effects of bacterial activity in water saturated sand. A 90-day laboratory-scale controlled experiment was conducted in a flow-through polycarbonate sandbox using groundwater from the Kansas River alluvial aquifer as inoculum. After 40 days of collecting baseline data, bacterial growth was stimulated in the sandbox by the addition of a carbon and nutrient solution on a weekly basis. Radar signal travel time and attenuation were shown to increase downgradient of the nutrient release wells relative to upgradient locations. After 60 days, the frequency of nutrient injections was increased to twice per week, after which gaseous bubbles were visually observed downgradient of the nutrient release wells. Visual observation of active gas production correlated spatially and temporally with a rapid decrease in radar signal travel time, confirming that GPR can monitor the generation of biogenic gases in this system. Analysis of the sediments indicated microbial lipid biomass increased by approximately one order of magnitude and there were no changes in the inorganic carbon content of bulk sediment mineralogy. These findings suggest that the increase in biomass and gas production may be responsible for the observed changes in radar signal travel time reported in this study. Therefore, this study provides evidence that GPR can be used to monitor biological activity in water saturated sand.
Collections
- Geology Scholarly Works [247]
Citation
Schillig, P.C., Tsoflias, G.P., Roberts, J.A., Patterson, E.M., Devlin, J.F. 2010. Ground-penetrating radar observations of enhanced biological activity in a sandbox reactor. Journal of Geophysical Research, v. 115, G00G10, http://dx.doi.org/10.1029/2009JG001151
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