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Electrical Resistivity Tomography (ERT) Surveys on Cedar River Floodplain, Cedar Rapids, Iowa, 2015

Dates

Publication Date
Start Date
2015-04-14
End Date
2015-04-23

Citation

Johnson, C.D., Bristow, E.L., White, E.A., Gruhn, L.R,. Pappas, K.L., Phillips, S.N., and Lane, J.W. Jr., 2020, Geophysical Data Collected in the Cedar River Floodplain, Cedar Rapids, Iowa, 2015-2017: U.S. Geological Survey data release, https://doi.org/10.5066/P9YXJDHX.

Summary

Electrical resistivity tomography (ERT) surveys were collected in April 2015 to support hydrogeologic characterization of the alluvial aquifer and to assess the suitability of larger-scale airborne geophysics. For this investigation, five sites were surveyed with ERT methods. At each site three surveys were collected, including dipole-dipole, Schlumberger, and inverse Schlumberger configurations. For each survey a total of 56 electrodes spaced 5-meters (m) apart were used. During the ERT measurement, current is injected through two current electrodes and voltage is measured sequentially across multiple pairs of potential electrodes, which is used to determine the apparent resistivity of the subsurface. Results were combined into a [...]

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Eric_White_Lance_Gruhn_CedarRapids_ERT.JPG
“ERT data collection”
thumbnail 933.53 KB image/jpeg
Edwd_CW3_5m.zip 250.94 KB application/zip
SVP_CW6_5m.zip 136.34 KB application/zip
SVP_S10_5m.zip 134.75 KB application/zip
SVPDemo-Day_5m.zip 156.72 KB application/zip
Ellis_CW1_5m.zip 176.18 KB application/zip
ERT_Archive_Notes_CedarRapids.pdf 101.82 KB application/pdf
Read_Me_ERT_CR-IA.txt 6.59 KB text/plain

Purpose

The electrical resistivity tomography (ERT) data were collected to determine the extent of the sand and gravel aquifer and determine hydrostratigraphic layers within the aquifer.
ERT data collection
ERT data collection

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