Modeling The Gpr Response Of Leaking, Buried Pipes

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