HR: 14:10h
AN: H12H-03 INVITED     [PDF]
TI: Investigating the Geoelectrical Stratigraphy of Clean and Contaminated Unconfined Aquifers
AU: * Endres, A L
EM: alendres@sciborg.uwaterloo.ca
AF: University of Waterloo, Department of Earth Sciences, Waterloo, ON N2L 3G1 Canada
AU: Mickle, R J
EM: james.mickle@uwaterloo.ca
AF: University of Waterloo, Department of Earth Sciences, Waterloo, ON N2L 3G1 Canada
AB: Various electrical and electromagnetic techniques are being used to image the geoelectrical stratigraphy of unconfined aquifers and infer the spatial distribution of water content and immiscible contaminant concentration. This inference is dependent on the accuracy of the petrophysical relationships between the geoelectrical properties (i.e., electrical conductivity and dielectric permittivity) and pore fluid contents. Currently, Archie's Law and Topp's Equation are two commonly used petrophysical relationships for geoelectrical data analysis. These two relationships were used to infer the vertical water content profile from geoelectrical data collected in a large test cell (3 meter diameter, 1.7 meters depth) containing repacked Borden sand. This profile differs from the water content profile predicted from the van Genuchten equation and obtained from neutron moisture probe measurements; the van Genuchten model and neutron data give mutually consistent results. Potential causes for this discrepancy and their impact on the estimation of water content and immiscible contaminant concentration are examined.
DE: 0925 Magnetic and electrical methods
DE: 1866 Soil moisture
DE: 1875 Unsaturated zone
DE: 5109 Magnetic and electrical properties
SC: Hydrology [H]
MN: 2003 Fall Meeting