Nonlinear inversion res2dinv3/7/2024 ![]() High values of chargeability were associated with the sediments in the floodplain, and low values were associated with bedrock, stream, and soil on the elevated banks above the stream. 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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