Physics – Geophysics
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3407404a&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 7, CiteID L07404
Physics
Geophysics
Hydrology: Hydrogeophysics, Paleoceanography: Instruments And Techniques, Hydrology: Rocks: Physical Properties, Physical Properties Of Rocks: Acoustic Properties, Physical Properties Of Rocks: General Or Miscellaneous
Scientific paper
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, expressed in terms of volumetric contaminant fraction, provided an excellent empirical fit to the laboratory measurements.
Ajo-Franklin J. B.
Geller J. T.
Harris Mark J.
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