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Numerical Method for Estimating Simultaneous Flow of Water and Salt in Unsaturated Soils¹

ABSTRACT

A numerical solution of non-interacting salt flow simultaneously with water in unsaturated soil was devised and programmed. Solutions were obtained for infiltration, redistribution, and evaporation under different wetting and boundary conditions. The effect of diffusion on salt distribution was neglected in the computations. The method was found to give reasonable results for non-interacting solutes. When compared with measured total salt distribution after one wetting and drying cycle, the model gave fairly good results when a source term was added to the computations. The method can be applied to some practical problems, such as leaching of salts and fertilizer movement.

¹ Contribution from Department of Agronomy, Colorado State University, Fort Collins. Published with the approval of the Director of the Colorado Agr. Exp. Sta. as Scientific Series Paper no. 1407. This work was supported in part by the Department of Interior, Office of Water Resources Research, under P. L. 88-379.

² Temporary Assistant Professor of Soil Science, Colorado State University, Fort Collins, and Professor, Soils and Meteorology, Utah State University, Logan. The authors wish to thank W. A. Norvell for helpful discussion during this investigation. The senior author is now at the Volcani Institute of Agricultural Research, Rehovot, Israel.

Received for publication March 13, 1969. Accepted for publication July 31, 1969.