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A Simple Method for Estimating Water Diffusivity of Unsaturated Soils

^a State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences, Yangling, 712100
^b Institute of Water Resources Research, Xi'an University of Technology, Xi'an 710048, China
^c Institute of Geographical Sciences and Natural Resources Research (Beijing 100101) and Institute of Soil and Water Conservation (Yangling, 712100) of Chinese Academy of Sciences, China
^d Dep. of Agronomy, Iowa State University, Ames, IA 50011

View larger version (11K): [in a new window]   Fig. 1. Cumulative infiltration versus the wetting front distance for three soils ([a] Yulin Sand, [b] Shuide Loam, and [c] Xian Silt Loam).

View larger version (13K): [in a new window]   Fig. 2. Infiltration rate versus the inverse wetting front distance for three soils ([a] Yulin Sand, [b] Shuide Loam, and [c] Xian Silt Loam).

View larger version (11K): [in a new window]   Fig. 3. Comparison of the simple method with the Bruce and Klute method ([a] Yulin Sand, [b] Shuide Loam, and [c] Xian Silt Loam; the solid points represent the Bruce and Klute method, the solid curves represent the new method for large soil columns, and the diamonds the new method for a small soil column).

View larger version (16K): [in a new window]   Fig. 4. Estimated soil water diffusivities for different wetting front distances in a soil column.