- Volume 4 Issue 5
In order to discuss the differences among the SMP(Surface Moisture Availability Parameter), by previous researchers on the basis of their own theoretical and empirical background, we assessed the SMP 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 0.07m3m-3 for sand, 0.l1m3m-3 for loam, 0.12 for clay, and 0.13m3m-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 SMP 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. Key words : SMAP(Surface Moisture Availability Parameter), Paddy field, Volumetric soil water content, Evaporation, Capillary potential.
- 한국환경과학회지 v.3 no.2 지표면 열수지의 강수응답성에 관한 연구 황수진;진병화
- 農業環境實驗法 渡部一郞
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- J. of Appl. Meteo. v.18 A Paramiterization of the Evaporaion from Non-saturated Surfaces Barton,I.J.
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- J. of Appl. Meteo. v.30 Analysis of Soil Moisture from Near-Surface Parameters: A Feasibility Study Mahfouf,J.F.
- Mon. Wea. Rev. v.117 A Simple Parameterization of Land Surface Processes for Meterological Models Noilhan,J.;S.Planton
- J. of Meteo. v.14 Evaporation, and Moisture and Heat Fields in the Soil Philip J.R.
- J. of Appl. Meteo. Soc. of Japan v.66 no.5 Parameterization of Evaporation from a Nonsaturated Bare Surface for Application in Numerical Prediction Models Toya,T.;N.Yasuda
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- J. of Appl. Meteo. v.16 Parameterization of Surface Evaporation Rate for Use in Numerical Modeling Yu,T.W.