Nonlinear inversion res2dinv

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The chargeability from the IP method showed larger scale features. The structure of the electrical resistivity above the bedrock showed small-scale elongated features. A near continuous trough ran alongside the stream within the floodplain, and is suggestive of a paleochannel among other interpretations of this feature. The inferred bedrock surface determined from the inversions exhibited undulating patterns with troughs and ridges. The soil-bedrock interface was determined through a trial and error approach using a sharp boundary feature in the inversion model. The bedrock is mostly comprised of limestone, and is generally resistive compared to the overlying soil. The shallow (<15 m depth) subsurface environment of a short reach along a bedrock stream was investigated with electrical resistivity and induced polarization (IP) to map details of bedrock and soil sediments.

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