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Estimation of Soil Evaporation Using the Differential Temperature Method

Guo Yu Qiua, J. Ben-Asherb, T. Yanoc and K. Momiid

a Lab. of Environmental Plant Sci., National Inst. Environ. Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-0053, Japan
b The Jacob Blaustein Inst. for Desert Res., Ben-Gurion Univ., Sede Boqer Campus 84993, Israel
c Arid Land Research Center, Tottori Univ., 1390 Hamasaka, Tottori 680, Japan
d Dep. of Environ. Sci. and Technol., Kagoshima Univ., 21-24 Korimoto 1, Kagoshima 890, Japan



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  		Fig. 1 Comparison between daily energy exchange over wet and reference dry soil (a) net radiation; (b) soil heat flux; (c) sensible heat flux

 


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  		Fig. 2 Typical sampling day of (a) net radiation and (b) soil heat flux over the dry and the wet soil as a function of daytime hours

 


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  		Fig. 3 Soil evaporation transfer coefficient ha and the integrated {int}Hdt/{int}Hddt as a function of time (Arrows mark the irrigation time)

 


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  		Fig. 4 {int}Hdt/{int}Hddt as a function of ha

 


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  		Fig. 5 (a) The changes of surface temperatures with time after irrigation. (b) The soil evaporation transfer coefficient ha as a function of time after irrigation

 


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  		Fig. 6 Cumulative soil evaporation measured by a weighing lysimeter and calculated by the differential method as a function of time

 




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Journal of Natural Resources
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Copyright © 1999 by the Soil Science Society of America.