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• W4247186112 abstract "PreviousNext No AccessSymposium on the Application of Geophysics to Engineering and Environmental Problems 2007Comparison of Airborne EM Inversions to Cone Penetrometer Results for Identifying Clay Layers Under Rio Grande LeveesAuthors: Greg HodgesJoseph DunbarSteve SmullenGreg HodgesFugro Airborne Surveys, Mississauga, OntarioSearch for more papers by this author, Joseph DunbarEngineer Research and Development Center, Vicksburg, MSSearch for more papers by this author, and Steve SmullenU.S. Section of the International Boundary and Water Commission, El Paso, TXSearch for more papers by this authorhttps://doi.org/10.4133/1.2924743 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Fugro Airborne Surveys flew a Helicopter Electromagnetic survey in 2001 over selected areas of levees bordering the Rio Grande River and floodways for the U.S. Army Corps of Engineers and the U.S. Section of the International Boundary and Water Commission. The goal of the survey was to identify the soils on which the levees were built by measuring the soil conductivity. In particular, it was necessary to define the location, extent, and thickness of near‐surface clay layers, which can resist under‐seepage. Since the original survey was flown, sections of the levees have been sampled with cone penetrometer tests (CPT). This project involved testing a wide range of inversion algorithms on the data set for effectiveness in identifying and measuring the clay layers, comparing the results of each inversion to the boring information. The inversion results shown are very consistent for the many algorithms, including the approximate resistivity sections, multi‐layer depth imaging and inversion, and discrete model inversions applied. Comparisons to the CPT borings are often good, but sometimes questionable. There is, however, some ambiguity in the double conversion from CPT resistance to soil type to electrical conductivity. Near‐surface conductive layers, assumed to be clays, were identified in many locations. The study demonstrated that each type of inversion has different applications and strengths.Permalink: https://doi.org/10.4133/1.2924743FiguresReferencesRelatedDetailsCited ByAssessment of the TEM‐8 Airborne Electromagnetic System for Ground Conductivity MeasurementsWilliam E. Doll, Jeannemarie Norton, T. Jeffrey Gamey, Bret Watkins, Barry Kinsall, J. Scott Holladay, and Ben Tatum11 May 2012 Symposium on the Application of Geophysics to Engineering and Environmental Problems 2007ISSN (online):1554-8015Copyright: 2007 Pages: 1557 publication data© 2007 Copyright © 2007 The Environmental and Engineering Geophysical SocietyPublisher:Environmental & Engineering Geophysical Society HistoryPublished: 30 Sep 2008 CITATION INFORMATION Greg Hodges, Joseph Dunbar, and Steve Smullen, (2007), Comparison of Airborne EM Inversions to Cone Penetrometer Results for Identifying Clay Layers Under Rio Grande Levees, Symposium on the Application of Geophysics to Engineering and Environmental Problems Proceedings : 823-829. https://doi.org/10.4133/1.2924743 Plain-Language Summary PDF DownloadLoading ..." @default.
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• W4247186112 title "Comparison of Airborne EM Inversions to Cone Penetrometer Results for Identifying Clay Layers Under Rio Grande Levees" @default.
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