Electromagnetic induction (EMI) data

Dates

Publication Date: 2022-01-04
Start Date: 2018-03-09
End Date: 2018-03-20

Citation

Burton, B.L., Hunter, L.E., Glover, M.T., Jackson, J.M., and Long, C., 2021, Electrical and electromagnetic geophysical surveys at Jim Woodruff Lock and Dam, Chattahoochee, Florida, March 2018: U.S. Geological Survey data release, https://doi.org/10.5066/P9FLKJKK.

Summary

Surface electrical resistivity tomography (ERT), electromagnetic induction (EMI), and self-potential (SP) data were acquired March 9 - 20, 2018 by the U.S. Geological Survey, in collaboration with the U.S. Army Corps of Engineers, at the Jim Woodruff Lock and Dam near Chattahoochee, Florida. Frequency-domain electromagnetic induction data were acquired along approximately 9 line-kilometers with the Geophex GEM-2 system to map variations in structure up to about 10 m in depth. This data release includes the raw and processed frequency-dependent in-phase and quadrature data. They are provided as digital data, and data fields are defined in the data dictionary. Jim Woodruff Lock and Dam is located on the Apalachicola River just [...]

Summary

Surface electrical resistivity tomography (ERT), electromagnetic induction (EMI), and self-potential (SP) data were acquired March 9 - 20, 2018 by the U.S. Geological Survey, in collaboration with the U.S. Army Corps of Engineers, at the Jim Woodruff Lock and Dam near Chattahoochee, Florida. Frequency-domain electromagnetic induction data were acquired along approximately 9 line-kilometers with the Geophex GEM-2 system to map variations in structure up to about 10 m in depth. This data release includes the raw and processed frequency-dependent in-phase and quadrature data. They are provided as digital data, and data fields are defined in the data dictionary.

Jim Woodruff Lock and Dam is located on the Apalachicola River just south of the confluence of the Flint and Chattahoochee Rivers along the Florida-Georgia border. Construction was completed in 1954 and impounds Lake Seminole. The dam has a long history of excessive seepage along the right abutment and below the fixed-crest spillway. Several karst features have been mapped over the years including sinkholes, both on land and along the lake bottom, and disappearing and reappearing streams. Such features were excavated and grouted during construction. Despite years of investigation of the dam foundation, there remains uncertainty on the flowpaths of water below the fixed-crest spillway and along the adjacent right abutment.

REFERENCE
Abraham, J.D., Deszcz-Pan, M., Fitterman, D.V., and Burton, B.L., 2006, Use of a handheld broadband EM induction system for deriving resistivity depth images, in 19th Annual Symposium on the Application of Geophysics to Engineering and Environmental Problems, Seattle, Washington, April 2–6, 2006, 18 p.

Contacts

Point of Contact :: Bethany L Burton
Originator :: Bethany L Burton, Lewis E Hunter, Matthew T Glover, John M Jackson, Christopher Long
Metadata Contact :: Bethany L Burton, GS GGGSC DM Team
SDC Data Owner :: Geology, Geophysics, and Geochemistry Science Center
USGS Mission Area :: Water Resources
Publisher :: U.S. Geological Survey
Distributor :: U.S. Geological Survey - ScienceBase

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JWD_2018_EMI.xml Original FGDC Metadata	View	34.54 KB	application/fgdc+xml
JWD_2018_EMI_DataDictionary.csv “Description of digital data”		3.93 KB	text/csv
JWD_2018_EMI_Data.csv “Raw and processed electromagnetic induction data”		22.9 MB	text/csv

Shapefile: JWD_2018_EMIlines.zip
JWD_2018_EMIlines.cpg		9 Bytes
JWD_2018_EMIlines.dbf		1,006 Bytes
JWD_2018_EMIlines.prj		450 Bytes
JWD_2018_EMIlines.sbn		580 Bytes
JWD_2018_EMIlines.sbx		148 Bytes
JWD_2018_EMIlines.shp		93.7 KB
JWD_2018_EMIlines.shx		476 Bytes

Purpose

These surface data were collected to contribute high-resolution information about subsurface geologic structure related to possible karstic features immediately downstream and along the right abutment of the concrete spillway of Jim Woodruff Lock and Dam, Chattahoochee, Florida.

Electromagnetic induction (EMI) data

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