Using electrical resistance tomography to map subsurface temperatures
Abstract
A method is provided for measuring subsurface soil or rock temperatures remotely using electrical resistivity tomography (ERT). Electrical resistivity measurements are made using electrodes implanted in boreholes driven into the soil and/or at the ground surface. The measurements are repeated as some process changes the temperatures of the soil mass/rock mass. Tomographs of electrical resistivity are calculated based on the measurements using Poisson's equation. Changes in the soil/rock resistivity can be related to changes in soil/rock temperatures when: (1) the electrical conductivity of the fluid trapped in the soil's pore space is low, (2) the soil/rock has a high cation exchange capacity and (3) the temperature changes are sufficiently high. When these three conditions exist the resistivity changes observed in the ERT tomographs can be directly attributed to changes in soil/rock temperatures. This method provides a way of mapping temperature changes in subsurface soils remotely. Distances over which the ERT method can be used to monitor changes in soil temperature range from tens to hundreds of meters from the electrode locations.
- Inventors:
-
- Pleasanton, CA
- San Francisco, CA
- Livermore, CA
- Issue Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- OSTI Identifier:
- 869486
- Patent Number(s):
- 5346307
- Assignee:
- Regents of University of California (Oakland, CA)
- Patent Classifications (CPCs):
-
G - PHYSICS G01 - MEASURING G01K - MEASURING TEMPERATURE
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- DOE Contract Number:
- W-7405-ENG-48
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- electrical; resistance; tomography; map; subsurface; temperatures; method; provided; measuring; soil; rock; remotely; resistivity; measurements; electrodes; implanted; boreholes; driven; ground; surface; repeated; process; changes; mass; tomographs; calculated; based; poisson; equation; related; conductivity; fluid; trapped; pore; space; cation; exchange; capacity; temperature; sufficiently; conditions; exist; observed; directly; attributed; provides; mapping; soils; distances; monitor; range; tens; hundreds; meters; electrode; locations; temperature change; temperature changes; cation exchange; temperature range; electrical resistance; electrical conductivity; electrical resistivity; method provides; ground surface; surface temperature; method provide; resistance tomography; resistivity measurements; subsurface soil; process changes; rock mass; surface temperatures; calculated based; resistivity changes; resistivity change; soil mass; measuring subsurface; map subsurface; temperatures remotely; exchange capacity; surface soils; /374/324/
Citation Formats
Ramirez, Abelardo L, Chesnut, Dwayne A, and Daily, William D. Using electrical resistance tomography to map subsurface temperatures. United States: N. p., 1994.
Web.
Ramirez, Abelardo L, Chesnut, Dwayne A, & Daily, William D. Using electrical resistance tomography to map subsurface temperatures. United States.
Ramirez, Abelardo L, Chesnut, Dwayne A, and Daily, William D. Sat .
"Using electrical resistance tomography to map subsurface temperatures". United States. https://www.osti.gov/servlets/purl/869486.
@article{osti_869486,
title = {Using electrical resistance tomography to map subsurface temperatures},
author = {Ramirez, Abelardo L and Chesnut, Dwayne A and Daily, William D},
abstractNote = {A method is provided for measuring subsurface soil or rock temperatures remotely using electrical resistivity tomography (ERT). Electrical resistivity measurements are made using electrodes implanted in boreholes driven into the soil and/or at the ground surface. The measurements are repeated as some process changes the temperatures of the soil mass/rock mass. Tomographs of electrical resistivity are calculated based on the measurements using Poisson's equation. Changes in the soil/rock resistivity can be related to changes in soil/rock temperatures when: (1) the electrical conductivity of the fluid trapped in the soil's pore space is low, (2) the soil/rock has a high cation exchange capacity and (3) the temperature changes are sufficiently high. When these three conditions exist the resistivity changes observed in the ERT tomographs can be directly attributed to changes in soil/rock temperatures. This method provides a way of mapping temperature changes in subsurface soils remotely. Distances over which the ERT method can be used to monitor changes in soil temperature range from tens to hundreds of meters from the electrode locations.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Jan 01 00:00:00 EST 1994},
month = {Sat Jan 01 00:00:00 EST 1994}
}