Assessment of the TEM‐8 Airborne Electromagnetic System for Ground Conductivity Measurements

PreviousNext No AccessSymposium on the Application of Geophysics to Engineering and Environmental Problems 2012Assessment of the TEM‐8 Airborne Electromagnetic System for Ground Conductivity MeasurementsAuthors: William E. DollJeannemarie NortonT. Jeffrey GameyBret WatkinsBarry KinsallJ. Scott HolladayBen TatumWilliam E. DollBattelle, Oak Ridge TNSearch for more papers by this author, Jeannemarie NortonBattelle, Oak Ridge TNSearch for more papers by this author, T. Jeffrey GameyBattelle, Oak Ridge TNSearch for more papers by this author, Bret WatkinsGEO Consultants, Kevil, KYSearch for more papers by this author, Barry KinsallGEO Consultants, Kevil, KYSearch for more papers by this author, J. Scott HolladayGeosensors, Toronto, ON, CanadaSearch for more papers by this author, and Ben TatumUSACE‐Memphis District, Memphis, TNSearch for more papers by this authorhttps://doi.org/10.4133/1.4721763 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract In August 2011, a demonstration of the Battelle TEM‐8 system was conducted in support of a project for the U.S. Army Corps of Engineers (USACE) — Memphis District (CE‐MVM) to evaluate the levee surrounding the city of Cairo, Illinois that protects Cairo from the Mississippi and Ohio Rivers during flood events. The objective of the project was to conduct trials of airborne geophysical systems for delineating potential areas of concern or structural weakness within the levee system. Ancillary data were also acquired with the Battelle VG‐16 airborne magnetic system. Both airborne systems are mounted on booms that extend to the sides and/or front of a Bell 206L helicopter. They were initially designed for mapping and detection of unexploded ordnance and other shallow metallic objects, to be flown at 1–5m above ground level (AGL). The TEM‐8 time‐domain electromagnetic system was reconfigured for this project by disabling the transmitter on the port side of the helicopter and acquiring near‐ and far‐offset data (relative to the activated starboard transmitter loop) on the starboard and port sides respectively. Time gate settings were also modified from the values used for UXO surveys. The VG‐16 system provided indications of power lines, conduits, and other metallic sources of interference, and, in one area, provided indications of subtle variations in the magnetic mineral content of in situ soils VG‐16 data has previously been observed to identify clay‐rich zones, or segments of stream channels where heavy (and often magnetite‐bearing) minerals are concentrated. The airborne data were evaluated by comparison with historic boring logs, records of sand boils and ground‐based electromagnetic data acquired at selected sites along the levee with a DualEM 642 system. Early interpretation indicates a strong relationship between portions of the levee system that have low electrical conductivity and zones that have historically high rates of seepage and concentrations of sand boils.Permalink: https://doi.org/10.4133/1.4721763FiguresReferencesRelatedDetails Symposium on the Application of Geophysics to Engineering and Environmental Problems 2012ISSN (online):1554-8015Copyright: 2012 Pages: 627 publication data© 2012 Copyright © 2012 The Environmental and Engineering Geophysical SocietyPublisher:Environmental & Engineering Geophysical Society HistoryPublished Online: 11 May 2012 CITATION INFORMATION William E. Doll, Jeannemarie Norton, T. Jeffrey Gamey, Bret Watkins, Barry Kinsall, J. Scott Holladay, and Ben Tatum, (2012), "Assessment of the TEM‐8 Airborne Electromagnetic System for Ground Conductivity Measurements," Symposium on the Application of Geophysics to Engineering and Environmental Problems Proceedings : 240-249. https://doi.org/10.4133/1.4721763 Plain-Language Summary PDF DownloadLoading ...