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Determlning And Mapplng Dnapl Saturation Values From Nonlnvasive Gpr MeasurementsNormal access

Authors: Kristen W. Sneddon, Gary R. Olhoeft and Michael H. Powers
Event name: 13th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems
Session: Ground-Penetrating Radar & Subsurface Hydrology
Publication date: 20 February 2000
Organisations: EEGS
Language: English
Info: Extended abstract, PDF ( 1.05Mb )

Summary:
With the possible application to fluid-flow modeling, saturation values of dense nonaqueous phase liquids
(DNAPLs) may be determined and mapped through the use of measurements acquited by noninvasive ground
penetrating radar (GPR). In 1991, a controlled injection of perchloroethylene @CE), a common DNAPL, was
performed by the University of Waterloo into an isolated, water-saturated, sandy aquifer at Canadian Forces Base
Borden. One of the geophysical techniques employed by the U. S. Geological Survey to monitor the location and
migration of the subsequent plume was 5OOMHz surface GPR acquited on a one meter grid spacing across the
nine meter by nine meter cell over a period of 340 hours. This paper describes how full-waveform GPR modeling
of these data for relative dielectric permittivity versus depth may be used to calculate and map spatial distributions of
DNAPL saturation over time using recursive solutions of the Bmggeman-Hark-Sen (BHS) mixing formula.

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