Areal Variation and Chemical Modification of Weathered Shale Infiltration Characteristics1
- R. J. Luxmoore,
- B. P. Spalding and
- I. M. Munro2
Spatial variability of infiltration into a weathered shale subsoil were evaluated at a site proximal to one used for shallow land burial of low-level radioactive waste at Oak Ridge National Laboratory. Double-ring infiltrometers were installed at 48 locations on a 2- by 2-m grid after the removal of 1 to 2 m of soil (Litz-Sequoia association, Typic Hapludults). Infiltration rates were measured before and during the 0- to 20- and 239- to 259-day periods following treatment with solutions of NaOH, KOH, NaF, NaAlO2, and Na2SiO3 at rates of 151 equivalents/m2. None of these chemical treatments significantly altered infiltration rate, indicating that chemical modification of soil exchange properties may be achieved without inducing hydrologic disturbance in these subsoils. A semivariogram analysis of infiltration data showed that areal variability was random; any spatial patterning must therefore occur at a smaller scale than 2 m. The frequency distribution of infiltration rate fitted a lognormal model with a geometric mean of 2 cm per day and a coefficient of variation of 130%.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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