Estimating A New Approach For Describing
Electrical Conductivity Parameters In Partially
Saturated Sediments
Author(s)
F. Ali Swaid
Abstract
Electrical resistivity imaging has the capacity to map changes in soil water
content and quality in the vadose zone. However, interpretation of the images is
difficult because of the numerous variables that influence the measured
resistivity. The dominant variables include porosity, degree of saturation, pore
water salinity, clay content and clay type.
There have been numerous models published that combine these variables in
order to predict the bulk electrical conductivity of any mixture. All these
equations need to be calibrated against controlled samples in order to determine
parameters that account for geometrical effects and grain surface conduction.
Recently, Glover et al. (Earth and Planetary Science Letters 2000) published
an extension to Archie’s equation to account for the nonlinear behavior seen in
the relationship between pore water salinity and soil/rock bulk conductivity. In
this paper the Glover et al. model is extended to partial saturation conditions.
The application of the new model in the evaluation of salinity and changes of
soil moisture is possible wherever the required criteria are met. Furthermore,
more, this relation can also be taken to estimate the changes in soil moisture
caused by root uptake.
Keywords: partial saturation, cation exchange capacity, saturation exponent,
geometric factor, water conductivity, bulk conductivity.
Keywords
partial saturation, cation exchange capacity, saturation exponent,geometric factor, water conductivity, bulk conductivity
Related Book
Other papers in this volume
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