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Modeling The Gpr Response Of Leaking, Buried PipesNormal access

Authors: Michael H. Powers and Gary R. Olhoeft
Event name: 9th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems
Session: Gpr Applications
Publication date: 28 April 1996
Organisations: EEGS
Language: English
Info: Extended abstract, PDF ( 1.26Mb )

Using a 2SD, dispersive, full waveform GPR modeling program that generates complete GPR response
profiles in minutes on a Pentium PC, the effects of leaking versus non-leaking buried pipes are examined. The
program accounts for the dispersive, lossy nature of subsurface materials to GPR wave propagation, and accepts
complex functions of dielectric permittivity and magnetic permeability versus frequency through Cole-Cole
parameters fit to laboratory data. Steel and plastic pipes containing a DNAPL chlorinated solvent, an LNAPL
hydrocarbon, and natural gas are modeled in a surrounding medium of wet, moist, and dry sand. Leaking fluids are
found to be more detectable when the sand around the pipes is fully water saturated. The short runtimes of the
modeling program and its execution on a PC make it a useful tool for exploring various subsurface models.

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