1887
Volume 6, Issue 4
  • ISSN: 1569-4445
  • E-ISSN: 1873-0604

Abstract

ABSTRACT

This work deals with a multicomponent ground‐penetrating radar data set obtained on Quaternary unconsolidated deposits of eolian, alluvial, lacustrine and marine sands with a choice of two cross‐dipole and two co‐polar antenna configurations. The geophysical response is characterized by strong reflectors observed in both co‐ and cross‐polarized 100 MHz data sets down to a two‐way time (TWT) of 400 ns. With this data set we delineate a given horizon using its overall polarization direction, which is different from that defined by the position of the antennas and of profile direction. That horizon, whose existence was not previously known, represents a more complex situation than an isolated body, e.g., a buried metallic pipe, a situation well studied elsewhere.

The polarizing horizon is characterized by linear polarization and a reasonable uniformity of an Alford rotation angle that maximizes the co‐polar responses. With the modal Alford angle we produce improved images corresponding to the two co‐polar components and a conspicuous improvement in the continuity of the reflectors across the polarizing horizon. All goes as if the antennas were oriented parallel and perpendicular to the main polarizing direction of the structure. In addition, the two co‐polar components display a good degree of independence from each other as revealed by their eigenvalues. Our results illustrate how a data set collected with less than optimal field geometry can still satisfactorily reveal the subsurface.

Loading

Article metrics loading...

/content/journals/10.3997/1873-0604.2008021
2008-05-01
2024-03-29
Loading full text...

Full text loading...

References

  1. AnnanA.P.2001. Workshop Notes.Sensors & Software Inc.
    [Google Scholar]
  2. BorgesH.V.1990. Dinâmica sedimentar da Restinga de Marambaia e Baía de Sepetiba (Sedimentary dynamics of the Marambaia Isthmus and Sepetiba Bay).MSc thesis, UFRJ (Federal University of Rio de Janeiro), Rio de Janeiro (in Portuguese).
    [Google Scholar]
  3. DanielsJ.J., WielopolskiL., RadzeviciusS. and BooksharJ.2003. 3‐D GPR polarization analysis for imaging complex objects. Symposium on the Application of Geophysics to Environmental and Engineering Problems (SAGEEP), San Antonio, Texas, USA, Expanded Abstracts.
    [Google Scholar]
  4. GuyE.D., DanielsJ.J. and RadzeviciusS.J.1999. Demonstration of using crossed dipole GPR antennas for site characterization. Geophysical Research Letters26, 3421–3424.
    [Google Scholar]
  5. KrukJ., WapenaarC.P.A., FokkemaJ.T. and BergP.M.2003. Three‐dimensional imaging of multi‐component ground‐penetrating radar data. Geophysics68, 1241–1256.
    [Google Scholar]
  6. RadzeviciusS.J. and DanielsJ.J.2000. Ground penetrating radar polarization and scattering from cylinders. Journal of Applied Geophysics45, 111–125.
    [Google Scholar]
  7. RobertsR.L. and DanielsJ.J.1996. Analysis of GPR polarization phenomena. Journal of Environmental and Engineering Geophysics1, 139–157.
    [Google Scholar]
  8. SassenD.S. and EverettM.E.2005. Multi‐component ground penetrating radar for improved imaging and target discrimination. 18th Annual SAGEEP meeting, Atlanta, Georgia, USA, p. 11.
    [Google Scholar]
  9. StreichR., van der KrukJ, GreenA.G. and NobesD.C.2004. Three‐dimensional multi‐component georadar surveying near the Alpine Fault, New Zealand. Tenth International Conference on Ground Penetrating Radar, Delft, The Netherlands, pp. 349–352.
    [Google Scholar]
  10. TravassosJ.M. and SimõesJ.C.2004. High‐resolution radar mapping of internal layers of a subpolar ice cap, King George Island, Antarctica. Pesquisa Antártica Brasileira (Brazilian Antarctic Research). Brazilian Academy of Sciences4, 57–65.
    [Google Scholar]
  11. TravassosJ.M., SimõesJ.C. and MusaJ.E.2005. Multi‐component GPR imaging of Marambaia Isthmus. 9th International Congress of Brazilian Geophysical Society, Salvador, Bahia, pp. 11–14.
    [Google Scholar]
  12. Van GestelJ.P. and StoffaP.L.2001. Application of Alford Rotation to ground‐penetrating radar data. Geophysics66, 1781–1792.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/journals/10.3997/1873-0604.2008021
Loading
/content/journals/10.3997/1873-0604.2008021
Loading

Data & Media loading...

  • Article Type: Research Article

Most Cited This Month Most Cited RSS feed

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error