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Isothermal and Nonisothermal Evaporation from Four Sandy Soils of Different Water Repellency

^a Institute of Soil Science, Univ. of Hannover, Herrenhaeuser Str. 2, 30419 Hannover, Germany
^b Dep. of Agronomy, Iowa State Univ., Ames, Iowa 50011-1020

View larger version (26K): [in a new window]   Fig. 1. Schematics of a column.

View larger version (19K): [in a new window]   Fig. 2. Water retention curve and unsaturated hydraulic conductivity of Soil BW (contact angle <5°), Soil AW (contact angle 45°), Soil AH (contact angle 93°), and Soil BH (contact angle 110°) at 20°C. Symbols do not represent data but are shown to identify the curves.

View larger version (17K): [in a new window]   Fig. 3. Measured cumulative amount of evaporated water (squared) versus time for all soils. All values are averages of the two experiments.

View larger version (149K): [in a new window]   Fig. 4. Salt residues after evaporation of a saturated NaCl-KCl salt solution in a wettable and a hydrophobic glass beaker.

View larger version (30K): [in a new window]   Fig. 5. Measured and simulated isothermal and nonisothermal cumulative evaporation (upper graphs) and measured and simulated residual volumetric water content after 195 d (lower graphs) for the wettable Soil BW. All values are averages of the two experiments.

View larger version (29K): [in a new window]   Fig. 6. Measured and simulated isothermal and nonisothermal cumulative evaporation (upper graphs) and measured and simulated residual volumetric water content after 195 d (lower graphs) for the water repellent Soil BH. All values are averages of the two experiments.