2D RESISTIVITY TOMOGRAPHY
is used for 2.5D modeling and
2D tomographic reconstruction inversion) of DC resistivity measurements on a PC
running DOS. RESITOMO can help to plan and interpret Geotechnical Engineering
and Exploration surveys to delineate waste disposal sites, mineral deposits in
advance of mining, and cavities in advance of construction.
RESITOMO can use any combination of vertical
and horizontal electrode positions in a plane, including the surface
topographic relief. Electrode arrays can be pole-pole, pole-dipole,
dipole-dipole or Wenner. Algorithms employed are well known: Finite Elements
(FE) for 2.5D forward modeling and SIRT for 2D reconstruction.
RESITOMO is completely menu-driven. The
resistivity model is entered with the mouse and the FE grid is created
automatically. All I/O is in (directly readable) ASCII format, permitting easy
editing and assessment. The final image can be seen directly on the screen and
can be further processed or presented with any mapping software. The three
figures show an image obtained by SIRT inversion of a block model, a progressive
reduction in RMS error during iterative reconstruction, and a field example of a
flooded cavity (data courtesy of DMT).