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Published in Soil Sci Soc Am J 25:5-8 (1961)
© 1961 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Sand-Model Study of Buffer Effects in the Double-Ring Infiltrometer1

Dale Swartzendruber and Tamlin C. Olson2

ABSTRACT

Infiltration of water has been studied for a wedgeshaped sand model built as a sectorial portion of the double-ring infiltrometer flow system. Determinations of infiltration velocity for localized portions of the flooded sand surface permit the assessment of buffer effects.

At any given time after infiltration has commenced, the velocity is essentially constant over a rather large central portion of the flooded area, but increases sharply as the outer ring radius, rn, is closely approached. However, the essentially invariant central velocity cannot be taken as the one-dimensional velocity, or infiltration rate, unless rn is sufficiently large; in this study, the smallest permissible value for rn was 12 inches. For rn = 8 inches, which corresponds approximately to many of the ring systems used heretofore, the essentially invariant central velocity was as much as double the infiltration rate.

NOTES

1 Journal Paper No. 1597, Purdue University Agr. Exp. Sta., Lafayette, Ind. Contribution from the Department of Agronomy, and supported in part by Research and Marketing Contract No. 12-14-100-1031(41) of the Soil and Water Conservation Research Division, ARS, USDA. Presented before Div. I, Soil Science Society of America, Nov. 19, 1959, at Cincinnati, Ohio.

2 Associate Professor of Soils and Graduate Research Assistant, respectively.

Received for publication April 11, 1960. Accepted for publication May 19, 1960.






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