The dielectric properties of granular media saturated with DNAPL/water mixtures

We present the results of five experiments investigating the dielectric properties of granular materials partially saturated with trichloroethylene (TCE), a common dense non‐aqueous contaminant. Previous research has investigated the radar signatures of similar solvents in controlled field experimen...

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Bibliographic Details
Published in:Geophysical research letters 2004-09, Vol.31 (17), p.L17501.1-n/a
Main Authors: Ajo-Franklin, J. B., Geller, J. T., Harris, J. M.
Format: Article
Language:English
Subjects:
DIELECTRIC PROPERTIES
Earth, ocean, space
Exact sciences and technology
GRANULAR MATERIALS
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
MIXTURES
ORGANIC COMPOUNDS
SATURATION
WATER
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Summary:We present the results of five experiments investigating the dielectric properties of granular materials partially saturated with trichloroethylene (TCE), a common dense non‐aqueous contaminant. Previous research has investigated the radar signatures of similar solvents in controlled field experiments but no core‐scale measurements have verified the appropriate petrophysical model. Broadband dielectric measurements were performed using a time domain reflectometry (TDR) system coupled to a solvent‐compatible coaxial transmission line. Two synthetic samples and three natural aquifer samples were fully saturated with water and then subjected to an axial TCE injection until breakthrough was observed. The resulting dielectric measurements show good agreement with the empirical complex refractive index model (CRIM) allowing a reasonable prediction of the radar reflectivities and transmission velocities expected in field surveys targeting pools of similar non‐aqueous contaminants.
ISSN:0094-8276
1944-8007
DOI:10.1029/2004GL020672