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DIVISION S-1-SOIL PHYSICS

A Note on Calculating Hysteretic Behavior

Agricultural University of Athens, Iera odos 75, 11855 Athens, Greece

lhyd4kag{at}auadec.aua.gr

A computational procedure for approximating the hysteretic relationship between pore water content and pressure head in porous bodies is described. A distribution function is introduced that retains the features of the distribution function F of the independent domain model, but its values are obtained by partitioning the slopes of the wetting boundary curve of a reproducible hysteresis loop proportionately to the slopes of the drying boundary curve or vice versa. With the help of data provided by a primary drying scanning curve the procedure can be extended to approximate the hysteretic curves in the presence of nonindependent water elements. Calculated scanning curves were compared with experimental ones and satisfactory agreement between calculated and experimental scanning curves was observed.