Forced gradient tracer experiment in a coastal sandy aquifer, Georgetown Site, South Carolina

Josep Mas-Pla, Tian-Chyi J Yeh, John F. McCarthy, T. M. Williams

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

A two-well tracer experiment was conducted in a coastal, sandy aquifer in South Carolina to investigate tracer migration in ground-water systems. Chloride tracer was injected into the aquifer under a steady flow condition created by continuous injection and withdrawal of ground water at an injection and a withdrawal well dipole separated by a distance of 5 meters. Breakthrough data were collected at several depths from two multilevel sampling wells, 1.5 meters apart, between the injection well and the withdrawal well. A one-dimensional advection-dispersion model that considers the nonuniform velocity field of the two-well experiment was employed to estimate the hydrologic properties of the aquifer. The values of the porosity and dispersivity were estimated by fitting the model to the observed breakthrough data collected at three depths at one sampling well (Well A). These values were then used to predict the breakthroughs at the same depths in the other sampling well (Well B). A two-dimensional flow and transport model was also employed to simulate the tracer migration. Results of both one- and two-dimensional simulations show that these models fail to predict the tracer breakthrough at Well B using parameter values obtained from Well A. The failure of the model to predict breakthroughs at Well B suggests that a three-dimensional characterization of aquifer heterogeneities and a three-dimensional modeling effort may be needed in order to capture the complex flow pattern in the aquifer.

Original languageEnglish (US)
Pages (from-to)958-964
Number of pages7
JournalGround Water
Volume30
Issue number6
StatePublished - Nov 1992

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Aquifers
tracer
aquifer
Sampling
experiment
Experiments
Groundwater
sampling
well
three-dimensional modeling
two-dimensional flow
dispersivity
groundwater
steady flow
Advection
Steady flow
flow pattern
Flow patterns
advection
Porosity

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Water Science and Technology

Cite this

Forced gradient tracer experiment in a coastal sandy aquifer, Georgetown Site, South Carolina. / Mas-Pla, Josep; Yeh, Tian-Chyi J; McCarthy, John F.; Williams, T. M.

In: Ground Water, Vol. 30, No. 6, 11.1992, p. 958-964.

Research output: Contribution to journalArticle

Mas-Pla, J, Yeh, T-CJ, McCarthy, JF & Williams, TM 1992, 'Forced gradient tracer experiment in a coastal sandy aquifer, Georgetown Site, South Carolina', Ground Water, vol. 30, no. 6, pp. 958-964.
Mas-Pla, Josep ; Yeh, Tian-Chyi J ; McCarthy, John F. ; Williams, T. M. / Forced gradient tracer experiment in a coastal sandy aquifer, Georgetown Site, South Carolina. In: Ground Water. 1992 ; Vol. 30, No. 6. pp. 958-964.
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