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Estimation of LNAPL saturation in fine sand using time-domain reflectometry

Haridy, SA; Persson, Magnus LU and Berndtsson, Ronny LU (2004) In Hydrological Sciences Journal 49(6). p.987-1000
Abstract
Recently, substantial progress has been made in detection and observation of non-aqueous phase liquids (NAPLs) in the subsurface using different experimental techniques. However, there is still a lack of appropriate direct methods to measure the saturation of NAPL theta(NAPL)). This paper provides a guide for estimating theta(NAPL) and water content (theta(a)) in unsaturated and saturated sand based on direct measurements of soil dielectric constant (K-a) and electrical conductivity (sigma(a)) using time domain reflectometry (TDR). The results show that the previously used dielectric mixing model fails to predict, theta(NAPL) in the case of a four-phase system. A new methodology is suggested and exemplified by showing that the measured K-a... (More)
Recently, substantial progress has been made in detection and observation of non-aqueous phase liquids (NAPLs) in the subsurface using different experimental techniques. However, there is still a lack of appropriate direct methods to measure the saturation of NAPL theta(NAPL)). This paper provides a guide for estimating theta(NAPL) and water content (theta(a)) in unsaturated and saturated sand based on direct measurements of soil dielectric constant (K-a) and electrical conductivity (sigma(a)) using time domain reflectometry (TDR). The results show that the previously used dielectric mixing model fails to predict, theta(NAPL) in the case of a four-phase system. A new methodology is suggested and exemplified by showing that the measured K-a gives accurate estimation of theta(NAPL) for a three-phase system while in a four-phase system, both sigma(a) and K-a need to be measured. The results show that using the suggested methodology, accurate predictions of theta(w) (R-2 = 0.9998) and theta(NAPL) lower than 0.20 m(3) m(-3) (average R-2 = 0.9756) are possible. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
time domain, LNAPL, dielectric constant, electric conductivity, water content, reflectometry
in
Hydrological Sciences Journal
volume
49
issue
6
pages
987 - 1000
publisher
IAHS Press
external identifiers
  • wos:000225364500005
  • scopus:10244226677
ISSN
0262-6667
DOI
10.1623/hysj.49.6.987.55729
language
English
LU publication?
yes
id
be0b8aff-72a5-4e22-b28a-881ed1031b2e (old id 259656)
date added to LUP
2007-10-29 14:27:57
date last changed
2017-01-01 07:14:47
@article{be0b8aff-72a5-4e22-b28a-881ed1031b2e,
  abstract     = {Recently, substantial progress has been made in detection and observation of non-aqueous phase liquids (NAPLs) in the subsurface using different experimental techniques. However, there is still a lack of appropriate direct methods to measure the saturation of NAPL theta(NAPL)). This paper provides a guide for estimating theta(NAPL) and water content (theta(a)) in unsaturated and saturated sand based on direct measurements of soil dielectric constant (K-a) and electrical conductivity (sigma(a)) using time domain reflectometry (TDR). The results show that the previously used dielectric mixing model fails to predict, theta(NAPL) in the case of a four-phase system. A new methodology is suggested and exemplified by showing that the measured K-a gives accurate estimation of theta(NAPL) for a three-phase system while in a four-phase system, both sigma(a) and K-a need to be measured. The results show that using the suggested methodology, accurate predictions of theta(w) (R-2 = 0.9998) and theta(NAPL) lower than 0.20 m(3) m(-3) (average R-2 = 0.9756) are possible.},
  author       = {Haridy, SA and Persson, Magnus and Berndtsson, Ronny},
  issn         = {0262-6667},
  keyword      = {time domain,LNAPL,dielectric constant,electric conductivity,water content,reflectometry},
  language     = {eng},
  number       = {6},
  pages        = {987--1000},
  publisher    = {IAHS Press},
  series       = {Hydrological Sciences Journal},
  title        = {Estimation of LNAPL saturation in fine sand using time-domain reflectometry},
  url          = {http://dx.doi.org/10.1623/hysj.49.6.987.55729},
  volume       = {49},
  year         = {2004},
}