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Published in Soil Sci Soc Am J 40:815-820 (1976)
© 1976 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Evaluation of a Capillary Bundle Model for Describing Solute Dispersion in Aggregated Soils1

P. S. C. Rao, R. E. Green, L. R. Ahuja and J. M. Davidson2

ABSTRACT

A simple capillary bundle model was evaluated for describing solute dispersion in two well-aggregated soils of Hawaii. The model enables the use of pore-water velocity distribution rather than an average pore-water velocity. The pore-size distribution was calculated from the soil water characteristic data. The position and relative shape of the break-through curves calculated by the capillary bundle model was dependent more on the pore-water velocity distribution than on dispersion owing to mixing within a pore. The predicted breakthrough curves were extremely skewed and did not describe the measured curves. The mixing of solute between adjacent flow paths, a process not accounted for in the model, apparently resulted in failure of the model. A measure of pore accessibility and interconnectedness of pore sequences is essential for quantitative description of the influence of soil pore geometry on solute dispersion.

NOTES

1 Journal Ser. Pap. no. 1946 of the Hawaii Agric. Exp. Stn., Univ. of Hawaii, Honolulu. Presented before Div. S-1 and S-2 at the ASA Annual Meetings in Knoxville, Tenn. on 27 Aug. 1975. This research was conducted under Western Regional Project W-82.

2 Post Doctoral Fellow, Dep. of Soil Sci., Univ. of Fla., Gainesville, FL 32611, Professor and Assistant Soil Scientist, Dep. of Agronomy and Soil Science, Univ. of Hawaii, Honolulu, Hl 96822, and Professor, Dep. of Soil Sci., Univ. of Fla., Gainesville, FL 32611, respectively.

Received for publication October 24, 1975. Accepted for publication August 2, 1976.






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