Hysteresis During Infiltration and Redistribution in a Soil Column at Different Initial Water Contents

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Abstract

<jats:p>Experimental results dealing with flow processes involving hysteresis effects in the suction‐water content relationship were obtained on a vertical column of soil submitted to the following successive controlled flow conditions: (1) redistribution of water following a constant head infiltration in an initially air‐dried column. (2) constant head infiltration followed by redistribution, and (3) constant flux infiltration followed by controlled evaporation and redistribution.</jats:p><jats:p>Water contents were measured by using gamma ray attenuation, and water suctions were obtained simultaneously from 10 pressure transducers distributed along the soil column, each one being connected to a tensiometer. A data acquisition system permitted fully automated measuring sequences. All the data were punched on tape and treated with a computer.</jats:p><jats:p>Examination of the changes of water content and water suction at a given depth permitted us to obtain precise information on the hysteretic behavior of Ψ (θ). This analysis showed that the scanning curves for a single reversal can be defined uniquely with reference to the transition water content θ<jats:sub>*</jats:sub>, that the independent domain theory appears to be inadequate for describing soil water hysteresis completely, and that <jats:italic>k</jats:italic>(θ) can be considered practically unique.</jats:p>

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