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Comparison of Particle-Size Distribution Models for Estimating Water Retention Characteristic  

황상일 (미국 클락슨대학교 토목환경공학과)
Publication Information
Journal of Soil and Groundwater Environment / v.7, no.3, 2002 , pp. 103-114 More about this Journal
Abstract
Knowledge of soil water retention characteristic is essential for many problems involving water flow and organic solute transport in unsaturated soils. A physico-empirical approach based on the translation of the particle-size distribution (PSD) into a corresponding water retention curve has been accomplished by others using the concept that the pore-size distribution is directly related to PSD. This approach implies that details of a PSD curve may affect the estimation of water retention characteristic (WRC). To determine whether the WRC estimation using the Arya-Paris model could be affected by the selection of a PSD model, four PSD models with one to four fitting parameters were used. The Jaky model with only one fitting parameter had greater WRC estimation ability than other models with greater number of fitting parameters. The better performance of the Jaky model may be explained by the effect of soil structure in field soils.
Keywords
Particle-size distribution; water retention characteristic; Arya-Paris model; Jaky model;
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