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The new feature in NAMMU allows the user to solve simultaneously the groundwater
flow and electrical flow equations in three-dimensions. The results can
be used to describe the distribution of hydraulic parameters from the
combined geophysical hydrogeological data.
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Using electrical tomography, repeat resistivity images were recorded during
a 24-hour pump test performed on a shallow sand and gravel aquifer. Consecutive
electrical images show that changes in electrical properties of the subsurface,
and hence the change in saturation, were asymmetric around the pumped
well. This asymmetry emphasises the highly heterogeneous character of
most hydraulic systems and the consequent violation of assumptions implicit
to traditional pump test analysis.
This project has been developed in collaboration with the School of Earth
Sciences of the University of Birmingham and constitutes part of Jo Moore's
PhD.
