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Temperature Dependence of Water Retention Curves for Wettable and Water-Repellent Soils

^a Institute of Soil Science, Univ. of Hannover, Herrenhaeuser Str. 2, 30419, Hannover, Germany
^b Dep. of Agronomy, Iowa State Univ., Ames, IA 50011
^c U.S. Army Cold Regions Research and Engineering Lab., 72 Lyme Rd., Hanover, NH 03755

View larger version (47K): [in a new window]   Fig. 1. Schematic representation of an instrumented soil column.

View larger version (36K): [in a new window]   Fig. 2. Drying-wetting measured capillary pressure – water content (–) data points for all column depths, and fitted van Genuchten water retention model for the hydrophobic soil SLphob (upper graphs) and the hydrophobic sand (SDphob) (lower graphs).

View larger version (16K): [in a new window]   Fig. 3. Temperature parameter, ß0, versus water content, , (drying) for the hydrophobic soil (SLphob). Mean value of ß0 estimated from local analysis (mean of all depths) is -365 ± 35 K. Note that the value of ß0 for pure water is -766.45 K.

View larger version (43K): [in a new window]   Fig. 4. Global fit of the temperature-dependent van Genuchten function for the hydrophobic soil (SLphob) (drying and wetting).

View larger version (16K): [in a new window]   Fig. 5. Apparent contact angle, A, derived from drying water retention curves at 5°C, for the hydrophobic soil (SLphob).