Floating transient electromagnetic (FloaTEM) surveys in the Tallahatchie River near Shellmound, Mississippi

Dates

Publication Date: 2020-07-02
Date Collected: 2018-10-17

Citation

White, E.A., Johnson, C.D., Briggs, M.A., Adams, R.F., Stocks, S.J., Minsley, B.J., Kress, W.H., Rigby, J.R., and Lane, J.W., 2020, Floating and Towed Transient Electromagnetic Surveys used to Characterize Hydrogeology underlying Rivers and Estuaries: March - December 2018: U.S. Geological Survey data release. https://doi.org/10.5066/P9E5JBAF.

Summary

Floating transient electromagnetic (FloaTEM) data were acquired on the Tallahatchie River during October 2018. During the survey, approximately 18.3 line-kilometers were collected in the Shellmound, Mississippi study area. Data were collected by members of the U.S. Geological Survey, Hydrogeophysics Branch, Lower-Mississippi Gulf Science Center and the Aarhus University HydroGeophysics Group. FloaTEM data acquired along the Tallahatchie River in Leflore County, in Mississippi,were collected to characterize the subsurface resistivity structure in support of a U.S. Geological Survey groundwater investigation of the Mississippi Alluvial Plain. FloaTEM data were collected using an Aarhus University HydroGeophysics Group FloaTEM unit using [...]

Summary

Floating transient electromagnetic (FloaTEM) data were acquired on the Tallahatchie River during October 2018. During the survey, approximately 18.3 line-kilometers were collected in the Shellmound, Mississippi study area. Data were collected by members of the U.S. Geological Survey, Hydrogeophysics Branch, Lower-Mississippi Gulf Science Center and the Aarhus University HydroGeophysics Group. FloaTEM data acquired along the Tallahatchie River in Leflore County, in Mississippi,were collected to characterize the subsurface resistivity structure in support of a U.S. Geological Survey groundwater investigation of the Mississippi Alluvial Plain.
FloaTEM data were collected using an Aarhus University HydroGeophysics Group FloaTEM unit using a transmitter loop (Tx) size, 4 by 2 meter square (m^2), in an offset-loop receiver (Rx) configuration utilizing a receiver coil that is 0.5 by 0.5 m^2 in size (with an effective area of 35 m^2) towed about 7 meters behind the Tx loop. The Tx outputs dual currents of about 3 and 30 amperes (A) for dual-moment transmission. The measurement cycles take approximately 0.5 seconds to complete and are comprised of several hundred individual transients that are averaged into 1D soundings along the profile. This data release includes the averaged, culled, and inverted FloaTEM data along the survey line that were used to produce the final resistivity models. Digital data of the processed soundings are provided, and fields are defined in a data dictionary.
(1) Files with *AVERAGED.xyz and *AVERAGED.csv are space- and comma-delimited ASCII files that contain the least processed data where transients were averaged together and most coupled data were removed.Data locations are provided as UTM Zone 15 N projection and datum of WGS-84.
(2) Files with *CULLED.xyz and *CULLED.csv are space- and comma- delimited ASCII files containing the processed data where negatively-impacted transients and coupled data were removed using a combination of automated and manual processing. Data locations are provided as UTM Zone 15 N projection and datum of WGS-84.
(3) Files with *INVERTED.xyz and *INVERTED.csv are space- and comma-delimited ASCII files containing the inversion model results. Model locations are provided as UTM Zone 15 N projection and datum of WGS-84.
(4) Files with *WATER-DEPTH_DATA.xyz and *WATER-DEPTH_DATA.csv are space- and comma-delimited ASCII files containing the water-depth data as measured from the bottom of the transducer. Water-depth measurement locations are provided as UTM Zone 15 N, WGS-84.
(5) Files with *INVERTED_image.png and *INVERTED_image.pdf are the inverted model output as a 2D profile of electrical resistivity distribution in the subsurface.(5) Files with *INVERTED_image.png and *INVERTED_image.pdf are the inverted model output as a 2D profile of electrical resistivity distribution in the subsurface.

Contacts

Point of Contact :: Eric A. White, U.S. Geological Survey, Water Mission Area, Earth Surface Processes Division, Hydrogeophysics Branch
Originator :: E. A. White, C.D. Johnson, R.F. Adams, S.J. Stocks, B.J. Minsley, W.H. Kress, J.R. Rigby, J.W. Lane, Jr.
Metadata Contact :: Eric A White, U.S. Geological Survey, WATER
Publisher :: U.S. Geological Survey
Distributor :: U.S. Geological Survey - ScienceBase

Attached Files

sorting

Metadata First

Recent First

Alphabetical

Click on title to download individual files attached to this item.

Floating_transient_electromagnetic_(FloaTEM)_surveys_in_the_Tallahatchie_River_near_Shellmound_Mississippi.xml Original FGDC Metadata	View	14.56 KB	application/fgdc+xml
20181017_ShellmoundMS_FloaTEM_LINE120.png “Map showing location of Tallahatchie River FloaTEM survey as model residuals.”		1.98 MB	image/png
MS-FloaTEM.zip		6 MB	application/zip

Purpose

These data were collected to field test a new floating transient electromagnetic data collection system and contribute high-resolution information about subsurface geologic structure that can be used to delineate fresh-water/saline water contacts, delineate aquifer materials for water-resource investigations, and to inform hydrogeologic models.

Floating transient electromagnetic (FloaTEM) surveys in the Tallahatchie River near Shellmound, Mississippi

Dates

Citation

Summary

Summary

Contacts

Attached Files

sorting

Metadata First

Recent First

Alphabetical

Purpose

Preview Image

Communities

Associated Items

Tags

Provenance

Item Actions

View Item as ...

Save Item as ...

View Item...

Dates

Citation

Summary

Summary

Contacts

Attached Files sorting Metadata First Recent First Alphabetical

Purpose

Preview Image

Communities

Associated Items

Tags

Provenance

Item Actions

View Item as ...

Save Item as ...

View Item...

Attached Files

sorting

Metadata First

Recent First

Alphabetical