Aberado Ramirez, Principal Investigator, LLNL
Video 1.5a (:1:10)

Task Description

Electrical resistance tomography is used to create a 3-D visualiza-
tion of in situ remediation pro-
cesses such as air stripping, bioremediation, and subsurface heating.

The task (Video 1.5a) involves inducing an electrical current in the ground and measuring the potential distribution that results from the current flowing in the conductive subsurface. Pairs of electrodes are buried with some pairs acting as current source electrical dipoles and others acting as potential measuring dipoles (Figure 1.5).

The resistivity distribution of the area in the vicinity of the borehole is then calculated. The current paths are dependent on the resis-
tivity distribution within the geo-
logic material in the vicinity of the borehole. The Electrical Resis-
tance Tomography (ERT) inversion process involves solving both the forward and inverse resistivity problems.