Fracture Aperture Measurements and Migration of Solutes, Viruses, and Immiscible Creosote in a Column of Clay-Rich Till

K. Hinsby, L. D. McKay, P. Jørgensen, M. Lenczewski, Charles P Gerba

Research output: Contribution to journalArticle

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Abstract

A series of ground-water flow and tracer experiments were performed on an undisturbed column of fractured clay-rich till, 0.5 m diameter by 0.5 m long, in a pressure-controlled cell. The measured hydraulic conductivity of the sample was 1.0 to 1.2 × 10-6 m/sec and the average hydraulic gradient during the tracer experiments ranged from 0.45 to 0.49. The experiments clearly show that ground-water flow and contaminant migration through the sample is primarily controlled by fractures and root holes. Tracer experiments using a solute (chloride), colloid-sized bacteriophage (PRD-1 and MS-2) and uncharged latex microspheres, indicated very fast transport rates of 4 to 360 m/day. These rates are similar to fracture flow velocities calculated on the basis of the measured bulk hydraulic conductivity of the column, and measured fracture spacing, using the cubic law for flow through parallel-walled fractures. Fracture aperture values calculated from the ground-water flow data (35 to 56 μm) are of the same magnitude as values calculated from the breakthrough of tracers (13 to 120 μm). Aperture values calculated for fractures (1 to 94 μm) and root holes (2 to 188 μm), on the basis of measured immiscible creosote entry pressures, are also comparable with these values. The injected creosote, a DNAPL, penetrated most of the visible and a few invisible fractures and root holes, indicating that, for this till, fractures and root holes are important conduits for the transport of DNAPL's.

Original languageEnglish (US)
Pages (from-to)1065-1075
Number of pages11
JournalGround Water
Volume34
Issue number6
StatePublished - Nov 1996

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fracture aperture
creosote
Viruses
solute
virus
Clay
clay
tracer
groundwater flow
Groundwater flow
hydraulic conductivity
Hydraulic conductivity
experiment
fracture flow
Experiments
bacteriophage
colloid
flow velocity
Bacteriophages
spacing

ASJC Scopus subject areas

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

Cite this

Fracture Aperture Measurements and Migration of Solutes, Viruses, and Immiscible Creosote in a Column of Clay-Rich Till. / Hinsby, K.; McKay, L. D.; Jørgensen, P.; Lenczewski, M.; Gerba, Charles P.

In: Ground Water, Vol. 34, No. 6, 11.1996, p. 1065-1075.

Research output: Contribution to journalArticle

Hinsby, K. ; McKay, L. D. ; Jørgensen, P. ; Lenczewski, M. ; Gerba, Charles P. / Fracture Aperture Measurements and Migration of Solutes, Viruses, and Immiscible Creosote in a Column of Clay-Rich Till. In: Ground Water. 1996 ; Vol. 34, No. 6. pp. 1065-1075.
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