Mapping Tracer Movement in Unsaturated Sandstone Cross Borehole Electrical Resistivity Tomography
From successive images of resistivity we can determine changes
in moisture content and pore fluid conductivity of the soil and rock
The following images show changes in resistivity due to a saline tracer injected
in a shallow borehole near the centre of the borehole array at the Hatfield field site.
The image sequence shows
the isosurface of changes above 7.5% from the pre-tracer conditions. The tracer was
injected on the 14th and 15th March.
The effect
of lower permeability layers can be seen to impede vertical movement of the tracer.
Comments on this information may be mailed to
A.Binley@lancaster.ac.uk
Last updated on 14 March 2004