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Related Experiment Video

Updated: Jul 26, 2026

Extracting Metrics for Three-dimensional Root Systems: Volume and Surface Analysis from In-soil X-ray Computed Tomography Data

Extracting Metrics for Three-dimensional Root Systems: Volume and Surface Analysis from In-soil X-ray Computed Tomography Data

Published on: April 26, 2016

Plume and lithologic profiling with surface resistivity and seismic tomography.

David B Watson¹, William E Doll, T Jeffrey Gamey

¹Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, MS 6038, Oak Ridge, TN 37831-6038, USA. watsondb@ornl.gov

|April 12, 2005

Summary

Advanced geophysical methods precisely mapped subsurface contamination, guiding effective groundwater remediation strategies at a U.S. Department of Energy research center. These techniques identified contaminant plumes and geological features influencing transport.

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Area of Science:

Environmental Geophysics
Hydrogeology
Bioremediation

Background:

The U.S. Department of Energy (DOE) established a research center in Oak Ridge, Tennessee, for in situ field-scale bioremediation studies.
The site's saprolite, shale bedrock, and groundwater are contaminated with various pollutants, including nitrate, uranium, technetium, and tetrachloroethylene.

Purpose of the Study:

To utilize improved surface-based geophysical technologies for detailed subsurface imaging.
To guide groundwater remediation efforts by understanding contaminant transport pathways.

Main Methods:

Employed surface-based multielectrode resistivity and tomographic seismic refraction techniques to image subsurface to approximately 30 meters.
Verified geophysical findings through drilling, borehole geophysics, and groundwater sampling.

Main Results:

Geophysical methods effectively imaged a high-ionic strength contaminant plume.
Successfully defined the transition zone between saprolite and bedrock, crucial for understanding contaminant transport.
Geophysical data informed the selection of locations and depths for field research plots.

Conclusions:

Surface-based geophysical technologies offer unprecedented detail for guiding groundwater remediation.
These methods are effective in delineating contaminant plumes and critical geological interfaces influencing contaminant movement.