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Ultrasonic properties of granular media saturated with DNAPL/water J. B. Ajo-Franklin,1,2

Summary: Ultrasonic properties of granular media saturated with DNAPL/water
J. B. Ajo-Franklin,1,2
J. T. Geller,3
and J. M. Harris4
Received 23 December 2006; revised 13 February 2007; accepted 19 February 2007; published 11 April 2007.
[1] We present the results of four experiments
investigating the ultrasonic properties of granular materials
partially saturated with trichloroethylene (TCE), a dense
non-aqueous contaminant. P-wave velocity measurements
were made under in situ effective stress conditions using a
pulse transmission cell at %250 kHz. Two synthetic samples
and two natural aquifer cores were fully saturated with
water and then subjected to an axial injection of TCE. The
resulting measurements show reductions in P-wave velocity
of up to 15% due to contaminant saturation. A theoretical
model combining Gassmann fluid substitution and Hill's
equation was used to estimate the effects of DNAPL
saturation; this model underpredicted observed reductions
in velocity at high TCE saturations. A linear relationship,


Source: Ajo-Franklin, Jonathan - Earth Sciences Division, Lawrence Berkeley National Laboratory


Collections: Geosciences