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Solute Dispersion in Unsaturated Heterogeneous Soil at Field Scale: II. Applications¹

ABSTRACT

The model for nonadsorbed solute spread by vertical steady-state flow of water in a heterogeneous field soil, developed in Part 1, is applied to a Panoche soil with properties which have been investigated previously. Average solute concentration profiles as functions of depth and time are computed for various surface rates of infiltration. The average concentration over a layer extending from the soil surface to a given depth is also computed. It is shown that the concentration profile extends over an apparent mixing zone which is much larger than that predicted by a conventional diffusion-convection (dispersion) equation in a homogeneous fictitious field, and that the latter lacks practical significance for prediction of solute spread in the field. The implications of the results for the leaching of saline field soil and crop yield estimates as they are influenced by rate of surface recharge and its uniformity are also discussed.

¹ Contribution from Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel. 1978 Series, No. 194-E.

² Soil Physicist, The Volcani Center and Professor of Fluid Mechanics, Tel Aviv Univ., and Hydrologist, The Volcani Center, A.R.O., Bet Dagan, Israel, respectively.

Received for publication July 18, 1978. Accepted for publication January 4, 1979.

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