Research Article
Jun 1976
Water Quality and Aquitard Permeability
Publication: Journal of the Irrigation and Drainage Division
Volume 102, Issue 2
Abstract
Flow test on artificially sedimented illite-silt mixtures designed to simulate aquitard soils show that permeability changes accompanying changes in pore water dissolved salt concentration depend on the exchangable sodium percentage and the structural state of the clay. The dissolved salt concentration at which clay swelling causes permeability reductions and the concentration that causes clay dispersion both vary directly with exchangeable sodium percentage. Comparisons suggest that at equal exchangeable sodium percentages, flocculated-disaggregated illite particles swell more and disperse at slightly higher dissolved salt concentrations than when the particles have been previously aggregated into domains by drying. Permeability increases accompanying increases in dissolved salt concentrations are small. When the clay is not dispersed, permeability increases are proportional to the degree of clay swelling existing prior to the increase. Permeability increases in completely dispersed clays are inversely related to exchangeable sodium percentage. Subsequent replacement of seawater by freshwater recharge could result in more than an order of magnitude decrease in the permeability of aquitards.
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Published In
Journal of the Irrigation and Drainage Division
Volume 102 • Issue 2 • June 1976
Pages: 205 - 220
Copyright
© 1976 American Society of Civil Engineers.
History
Published in print: Jun 1976
Published online: Feb 11, 2021
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James H. Hardcastle, AM.ASCE
Asst. Prof. of Civ. Engrg., Univ. of Idaho, Moscow, Idaho
James K. Mitchell, F.ASCE
Prof. of Civ. Engrg., Univ. of California, Berkeley, Calif.
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Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
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