Summary

Primarily for environmental investigations, the 2D earth resistivity measurement on the surface is increasingly used for its potential to map the electric resistivity distribution in the earth from which an estimate of the heterogeneity is obtained. We have found that in pollution plume investigations, soil heterogeneity plays an important and not well-understood role in preferential flow paths of the pollution plume with the groundwater flow. Usually it is assumed that it follows the dominant groundwater flow pattern. We have observed in the field that complicated flow patterns are observed in heterogeneous soil that cannot be properly mapped with data from line surveys.

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