논문 상세보기
pp.427-436
In order to discuss the differences among the SMAP(Surface Moisture Availability Parameter), by previous researchers on the basis of their own theoretical and empirical background, we assessed the SMAP according to the soil types and volumetric soil water contents. The results are as follows. There are differences among all the five SMAPs. There`s a tendency that the larger grain size, the higher value of parameters. And they divided into two groups for their value: one group has parameters with exponential function and the other with cosine and linear function. The maximum difference between the two groups appears when the volumetric soil water contents are 0.07㎥m^-3 for sand, 0.11㎥m^-3 for loam, 0.12 for clay, and 0.13㎥m^-3 for silt loam. So, these differences must be considered when we estimate the surface evaporation rate. From field data, the paddy field soil around Junam reservoir is classified as a silt, has high wetness, 0.56. So, the parameter obtained from the field measurement is much higher than that of Clapp and Hornberger(1978)`s Table. This study treated the SMAP for a certain point of time in winter season. But if we measured the soil water contents continuously, we could obtain better time-dependent parameter.
