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  5. Towed and FloatingTransient Electromagnetic Surveys at Sites within the Mississippi Alluvial Plain: March and October, 2018
  6. Water-borne towed-transient electromagnetic survey data, along the Ouachita River near Monroe, Louisiana, October 2018

Water-borne towed-transient electromagnetic survey data, along the Ouachita River near Monroe, Louisiana, October 2018

Dates

Publication Date
Time Period
2018-10-21

Citation

Eric A. White, Carole D. Johnson, David C. Sasser, Ryan F. Adams, Shane J. Stocks, Wade H. Kress, James R. Rigby, and John W. Lane, Jr., 2022, Water-borne towed-transient electromagnetic survey data, along the Ouachita River near Monroe, Louisiana, October 2018: U.S. Geological Survey.

Summary

Water-borne towed transient electromagnetic method, commonly referred to as FloaTEM, was acquired along a single survey track on the Ouachita River during October 2018. During the survey, approximately 46.15 line-kilometers were collected near Monroe, Louisiana study area. Data were collected by members of the U.S. Geological Survey, Hydrogeophysics Branch, and Lower-Mississippi Gulf Science Center and the Aarhus University Hydrogeophysics Group. FloaTEM data acquired along the approximately 46.1 line kilometers of the Ouachita River in Ouachita Parish, in Louisiana,were collected to characterize the subsurface resistivity structure in support of a U.S. Geological Survey groundwater investigation of the Mississippi Alluvial Plain. [...]

Contacts

Point of Contact :
Eric A. White, U.S. Geological Survey, Water Mission Area, Observed Systems Division, Technical Development and Transfer Team
Originator :
Eric A. White, Carole D. Johnson, David C. Sasser, Ryan F. Adams, Shane J. Stocks, Wade H. Kress, James R. Rigby, John W. Lane, Jr.
Metadata Contact :
Eric A White, U.S. Geological Survey, WATER
Publisher :
U.S. Geological Survey
Distributor :
Eric A White, U.S. Geological Survey, WATER

Attached Files

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Water-borne_towed-transient_electromagneitc_survey_data_Ouachita_River_near_Monroe_Lousiana_October_2018_v3.xml
Original FGDC Metadata
View 		119.82 KB application/fgdc+xml
20181021_OuachitaRiver_MonroeLA_FloaTEM_NAD83_Albers_Conus_Rhoa_AVG.xyz 15.2 MB chemical/x-xyz
20181021_OuachitaRiver_MonroeLA_FloaTEM_NAD83_Albers_Conus_Rhoa_RAW.xyz 89.27 MB chemical/x-xyz
20181021_OuachitaRiver_MonroeLA_FloaTEM_WGS84_Lat-Long_Rhoa_AVG.xyz 15.3 MB chemical/x-xyz
20181021_OuachitaRiver_MonroeLA_FloaTEM_WGS84_Lat-Long_Rhoa_RAW.xyz 89.86 MB chemical/x-xyz
20181021_OuachitaRiver_MonroeLA_FloaTEM_WGS84_UTM_15N_Rhoa_AVG.xyz 15.29 MB chemical/x-xyz
20181021_OuachitaRiver_MonroeLA_FloaTEM_WGS84_UTM_15N_Rhoa_RAW.xyz 89.81 MB chemical/x-xyz
20181021_Water-borne_Towed-Transient_Electromagnetic_Survey_Data_OuachitaRiver_near_Monroe_Louisiana_October_2018_Low-Moment_High-Moment_Data.png
“Photo showing FloaTEM instrument during data collection on the Ouachita River.” 		thumbnail 481.67 KB image/png

Purpose

Surface geophysical methods can provide information for the characterization of the subsurface structure of the earth for aquifer investigations. Floating transient electromagnetic (FloaTEM) surveys provide resistivity soundings of the subsurface, which can be related to lithology and hydrogeology. In the floating TEM method, electrical current is cycled through a wire in a transmitter loop (Tx), which in turn produces a static magnetic field. When the current is abruptly terminated, an instantaneous current is induced in the earth, and it moves downward and outward as the induced current decays with time. The decay is controlled by the resistivity of the earth. A receiver (Rx) towed behind the Tx loop measures the secondary magnetic field as a function of time (dB/dt). Decaying voltage measurements at the receiver are converted to apparent resistivity, which can be inverted to recover the depth-dependent resistivity structure of the earth.
Photo showing FloaTEM instrument during data collection on the Ouachita River.
Photo showing FloaTEM instrument during data collection on the Ouachita River.

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  • USGS Lower Mississippi-Gulf Water Science Center

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