NDLI: Dielectric and GPR behaviour of free-phase napl mixtures: implications for the practical assessment of hydrocarbon contamination

Content Provider	IEEE Xplore Digital Library
Author	Cassidy, N.J.
Copyright Year	2004
Description	Author affiliation: School of Earth Sciences and Geography, Keele University (Cassidy, N.J.)
Abstract	Ground contamination by Non-Aqueous Phase Liquids (NAPLs) is one of the World's most pressing environmental issues. The investigation of NAPL pollution by non-invasive geophysical techniques is becoming increasingly commonplace, with GPR being one of the more popular techniques. Unfortunately, a high percentage of the current NAPL related GPR research focuses on contaminant mapping only, with little emphasis being placed on the nature of the signal and its relationship to material properties. By analysing the spatial variation in signal attenuation, wave velocity, etc, it is possible to obtain additional information on the macroscopic dielectric properties of the sub-surface materials that, in turn, can he used to assess the physical nature of the contaminants. By combining Finite-Difference, Time-Domain (FDTD) modeling methods with the direct dielectric measurement of NAPL contaminated materials, new insights have been gained into the nature of GPR wave propagation and signal attenuation at a coastal, LNAPL contaminated site. The results show that, despite the apparent similarity of some of the material properties, meaniingful variations do exist and may be used to aid data interpretation and analysis.
Starting Page	551
Ending Page	554
File Size	373229
Page Count	4
File Format	PDF
ISBN	9090179593
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-06-21
Publisher Place	The Netherlands
Access Restriction	Subscribed
Rights Holder	Delft Univ. of Technology
Subject Keyword	Ground penetrating radar Dielectric materials Geophysical measurements Dielectric measurements Hydrocarbons Time domain analysis Attenuation Permittivity Contamination Finite difference methods
Content Type	Text
Resource Type	Article

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