Environmental impact

What is the impact of an Electrical Tomography survey?

2D Electrical tomography  is performed along a line of sometimes 1 or more kilometers called, a  survey line.

Survey lines similar to trekking paths are cleared in the vegetation, these paths are wide enough  for a person to walk on easily  with geophysical equipment (cables, electrodes). The  paths are cleared using machetes  (and chain saws when necessary ie. if vegetation is particularly dense). Any cuts in the vegetation are made  high enough from the ground to enable full and rapid regrowth and to preserve the original  topography. No trees are rooted out. Only branches  in the way of the teams and  safe work practice are cut off.

The example of the Dome massif in New Caledonia can be given where survey lines created in 2004 were no longer passable in 2008 as the vegetation had completely regrown.

In the case of large-scale  campaigns, a botanist is referred to before the surveys begins, to identify any endemic, endangered or protected species and to train the crew to protect wildlife.

The environmental impact of Electrical Tomography is little to non-existant because :

  • Vegetation regrowth is rapid
  • ERT - material is very light and does not involve the use of much material
  • The ERT- technique is non-intrusive