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Unified Solution for Infiltration and Drainage with Hysteresis

Theory and Field Test

^a Soil Science Dep., Univ. of Saskatchewan, Saskatoon, SK, Canada S7N 5A8

View larger version (27K): [in a new window]   Fig. 1 A comparison of measured soil water storage, predicted soil water storage, and the predicted confidence (95%) interval during drainage using a unified solution with no hysteresis and the value of from infiltration

View larger version (20K): [in a new window]   Fig. 2 A comparison of measured soil water storage and predicted soil water storage during drainage using the Haines' Jump hysteresis model and the value of d from inverse procedures

View larger version (29K): [in a new window]   Fig. 3 Comparison of the predicted drying scanning curves from the Parlange (1976) model (dashed line) and corresponding equivalent Haines' Jump hysteresis model (dotted line) for initial water content = 0.38, 0.31, and 0.27. The Broadbridge and White (1988) Eq. [5] as the wetting curve is also shown (solid line)

View larger version (27K): [in a new window]   Fig. 4 A comparison of measured soil water storage, predicted soil water storage, and the predicted confidence interval (95%) during drainage using the Haines' Jump hysteresis model and an a priori value of estimated from Eq. [16] and the Parlange (1976) model