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This article in SSSAJ

  1. Vol. 56 No. 6, p. 1754-1758
     
    Received: Nov 14, 1991


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doi:10.2136/sssaj1992.03615995005600060016x

Dispersivity Values Determined from Effluent and Nonintrusive Resident Concentration Measurements

  1. M. Oostrom,
  2. J. H. Dane  and
  3. O. Güven
  1. Rijksinstituut voor Volksgezondheid en Milieuhygiene, Antonie van Leeuwenhoeklaan 9, P.O. Box 1, 3720 BA Bilthoven, the Netherlands
    Dep. of Agronomy and Soils, Auburn Univ., Auburn, AL 36849-5412
    Dep. of Civil Engineering, Auburn Univ., Auburn, AL 36849-5337

Abstract

Abstract

As indicated in the subsurface contaminant transport literature, the longitudinal dispersivity values needed to predict salt concentrations become smaller if more details of the flow field are included in the calculations. One way of determining these small-scale or local longitudinal dispersivities is from breakthrough curves using laboratory columns. A gamma radiation technique is presented that allows non-intrusive, in situ (resident) salt concentration measurements in saturated sand columns. The technique is demonstrated by means of a series of vertical displacement experiments with deionized water and a NaI solution in a column containing a medium sand. Longitudinal dispersivity values derived from the resident concentration breakthrough curves determined with this technique were consistently smaller than those derived from conventional effluent concentration breakthrough curves. The density configuration of the liquids may affect the apparent dispersivities.

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