Abstract
Spectral induced polarization (SIP) measurements have been made for different fluid conductivities on a sample of sand typical of the host material in New Zealand coastal aquifers. Fitting the data with a Cole-Cole model shows that neither the mean relaxation time nor the shape exponent depend upon the fluid conductivity. This is consistent with measurements of the hydraulic conductivity made on the same sample which also show no dependence on fluid conductivity. Simple predictions of permeability based on the Kozeny-Carmen relationship are of the correct order of magnitude but tend to overestimate the permeability. These results lay the groundwork for future measurements aimed more directly at drawing correlations between the SIP response and hydraulic properties of New Zealand aquifers.
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