Water and Chloride Movement Through a Layered Field Soil1
- J. L. Starr,
- J. -Y. Parlange and
- C. R. Frink2
Twenty porous ceramic samplers at each of four soil depths were arranged in a three-dimensional pattern to study the movement of water and Cl- through a layered sandy loam (sandy, mesic typic Dystrochrepts) over a gravely coarse sand with a perched water table at ∼180 cm. All samplers were used as tensiometers during the initial phase of the experiment in which salt-free water was ponded at the soil surface. After constant flow conditions were achieved, a pulse of 0.015 M CaCl2 solution was added to the infiltrating water and all samplers were then used to obtain soil water samples for Cl- analysis. Variations in soil water pressure were observed to be much smaller than the variations in Cl- concentration. Both water and Cl- data moved downward in a general one-dimensional pattern in the finer textured surface layer and in the zone directly above the water table, whereas, the movement between these two depths was three-dimensional, i.e., by fingering.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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