||Capillary-Diffusion and Self-Diffusion of Liquid Water in Unsaturated Soils.
Phillip, R. E. ;
Quisenberry, J, V. L. ;
||Kentucky Water Resources Inst., Lexington.
||RR-47; DI-14-01-0001-1636; OWRR-A-011-KY; 06908;
( Soil water ;
( Capillary water ;
Diffusion coefficient ;
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To evaluate the effect of soil water content, clay type, and clay content upon the capillary-diffusion of liquid water in unsaturated soil, and to attempt to establish a functional relationship between capillary-diffusion and self-diffusion of liquid water in unsaturated soil, capillary-diffusion coefficients were measured by use of inflow and outflow methods. With both methods the capillary-diffusion coefficients decreased very rapidly with decreasing water content. Self-diffusion coefficients were measured over a moisture content range from air dryness to saturation using tritium as a tracer. (Author)