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A Sensitivity Analysis of Electrical Resistivity Tomography Array Types Using Analytical Element Modeling

^a Hydrology and Water Resources Department, University of Arizona, Tucson, AZ 85721
^b Soil, Water, and Environmental Sciences Department, University of Arizona, Tucson, AZ 85721

View larger version (14K): [in a new window]   Fig. 1. Schematic diagram of solution domain including two heterogeneities and corresponding images.

View larger version (25K): [in a new window]   Fig. 2. Sensitivity maps for (A) Wenner, (B) Schlumberger, (C) double dipole, and (D) partially overlapping arrays. Contours of cumulative sensitivity relative to the total sensitivity are shown. All of the electrodes used in simulations for this study are shown as arrows. Long red arrows show current electrode locations and short blue arrows show potential electrodes for specific array for which sensitivity is shown. Note that the sensitivity scale differs among arrays.

View larger version (16K): [in a new window]   Fig. 3. Location of perturbations used to create survey set based on the locally optimal array. All of the electrodes used in simulations for this study are shown as arrows.

View larger version (21K): [in a new window]   Fig. 4. Normalized cumulative sensitivity map for locally optimal survey set. Contours of percentile contribution to the sensitivity are shown. All electrodes used are shown.

View larger version (19K): [in a new window]   Fig. 5. Sensitivity map for partially overlapping arrays that is the most sensitive to the location marked by *. Contours of cumulative sensitivity relative to the total sensitivity are shown. All of the electrodes used in simulations for this study are shown as arrows. Long red arrows show current electrode locations, and short blue arrows show potential electrodes for specific array for which sensitivity is shown.

View larger version (19K): [in a new window]   Fig. 6. Normalized survey sensitivity maps for (A) Wenner, (B) Schlumberger, (C) double dipole, and (D) partially overlapping arrays. Contours of cumulative sensitivity relative to the total sensitivity are shown. All of the electrodes used in simulations for this study are shown as arrows. Note that the sensitivity scale differs among arrays.