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A Predictor-Corrector Method for Measurement of Hydraulic Conductivity and Membrane Conductance¹

ABSTRACT

An experimental procedure is developed for the measurement of the hydraulic conductivity of unsaturated soil on wetting and drying processes taking into account the hysteresis phenomenon. The proposed method expedites the measurement of the hydraulic properties, minimizes experimental errors, and avoids ambiguity due to hysteresis. The dependence of the membrane conductance in a flow cell on the soil water content was also investigated. The membrane conductance decreases by several orders of magnitude as the soil dries, and increases following a wetting process. A power function seems to represent quite well the relationship between the membrane relative conductance and the soil relative hydraulic conductivity.

¹ This study was supported partly by the U.S. National Science Foundation through research project ENG7-800845, and partly by the Seagram Center for Soil and Water Sciences at the Hebrew University of Jerusalem, Rehovot, Israel.

² Associate Professor of Soil Physics, the Hebrew University of Jerusalem, Faculty of Agriculture, Rehovot, Israel; and Soil Scientist, USDA-ARS, and Professor of Soils, Colorado State University, Ft. Collins, CO, respectively.