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Horizontal Infiltration into Layered Soils¹

ABSTRACT

A numerical solution of the soil water movement equation is presented for horizontal infiltration into air-dry layered soils. The solution is based upon a scaled soil water diffusivity function common to six homogeneous soils and values of the microscopic characteristic length ascertained for each soil from homogeneous columns. Soil water content distributions and cumulative infiltration for different sequences of soil layers are analyzed. Agreement between experimental and theoretical infiltration profiles suggests a convenient means to study the influence of texture and hydraulic characteristics of different layers on the infiltration process.

¹ Contribution from the Department of Water Science & Engineering, University of California, Davis, 95616.

² Research Fellow and Professors of Water Science, respectively. The senior author, presently Professor of Physics, Dept. of Physics and Meteorology, University of Sao Paulo, Piracicaba, Brazil, acknowledges the financial support of the Rockefeller Foundation.

Received for publication April 10, 1972. Accepted for publication July 26, 1972.