抄録
The balk transfer method is one of the evaporation estimation methods. The amount of evaporated water from bare ground surfaces can be estimated from the general meteorological data using the method. A moisture exchange speed, ga, and evaporation efficiency, β are important parameters of the method, and they are influenced by volumetric water content in unsaturated soil. The authors have proposed the estimation method of the exchange speed considering the soil thermal capacity, ga,soil. In this paper, the evaporation efficiencies are obtained from our proposed procedure, the relationship between volumetric water content and evaporation efficiency of unsaturated sandy soil is discussed based on the experimental results. As the results, the properties of evaporation efficiency depend on volumetric water content are clearly explained.
