Abstract
The soil water characteristic and hydraulic conductivity curves of Shonai sand dune soil were measured from saturation to 25-MPa matric suction. The hydraulic conductivity was measured using a steady-state flux control and an instantaneous profile method in two different matric suction ranges. The determined hydraulic conductivity varies from 10−2 to 10−13 cm/s, with change in volumetric water content from saturation to 1.0%. An empirical equation relating hydraulic conductivity with volumetric water content was developed, which fits the measured data very well. The vapor and the liquid components of hydraulic conductivity were estimated. The estimated vapor component exceeds the liquid component below 2.1% (5-MPa matric suction) water content. The measured values of hydraulic conductivity were used to test the Mualem and the Burdine predictive equations. Both equations estimate the hydraulic conductivity fairly well at water contents higher than 18%, but overestimate the conductivity at medium water contents from 5 to 18%
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