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Mean Effective Pore Size and Clay Migration during Water Percolation in Soils¹

ABSTRACT

Calculations have been made of mean effective pore diameters based on the fractional open area and water permeability in six columns of different, laboratory-packed, water-saturated soils. The magnitudes of the pore diameters are associated with the occurrences of particle migration, but are unrelated to the absolute amounts of the latter, which have been measured by means of mechanical analyses, apparent densities and cumulative percolation values. Decreases in water permeability with time appear to be the result of pore-blocking in the columns partly by dispersed and deeply migrated, and partly by locally dispersed and locally-migrated, fine particles. A quantitative basis, termed the intensity of migration, has been used to express the magnitude of the illuviation of soil clay. The intensity of migration depends upon both physical and chemical properties of the soil concerned.

¹ Contribution from Division of Soil Technology, California College of Agriculture, Berkeley, California.

² Associate Professor of Soil Physics and Associate in the Experiment Station, respectively.