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Published in Soil Sci. Soc. Am. J. 67:1701-1702 (2003).
© 2003 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA

DIVISION S-1—NOTES

ON THE VANISHING OF SOLUTE DIFFUSION IN POROUS MEDIA AT A THRESHOLD MOISTURE CONTENT

A. G. Hunta and R. P. Ewing*,b

a Cooperative Institute for Research in the Environmental Sciences, Univ. of Colorado, Boulder, CO 80309-0216
b Dep. of Agronomy, Iowa State Univ., Ames, IA 50011-1010

* Corresponding author (ewing{at}iastate.edu).

It was recently shown that the solute diffusion coefficient tends to zero at some threshold water content. We examine this phenomenon in light of recent simulation results from a network diffusion model. The experimental and simulation results agree, inviting an explanation from continuum percolation theory.




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