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KMID : 1024520130220010119
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Journal of the Environmental Sciences
2013 Volume.22 No. 1 p.119 ~ p.129
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Comparison of Soil Evaporation Using Equilibrium Evaporation, Eddy-Covariance and Surface Soil Moisture on the Forest Hillslope
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Gwak Yong-Seok
Kim Sang-Hyun
Kim Su-Jin
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Abstract
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We compared equilibrium evaporation(��??????) eddy-covariance(��????) with soil moisture data(�Ι냥�?????? ) which were measured with a 2 hours sampling interval at three points for a humid forest hillslope from May 5th to May 31th in 2009. Accumulations of ��????, ��?????? for the study period were estimated as 2.52, 3.28 mm and those of �Ι냥�?????? were ranged from 1.91 to 2.88 mm. It suggested that the eddy-covariance method considering the spatial heterogeneity of soil evaporation is useful to evaluate the soil evaporation. Method A, B and C were proposed using mean meterological data and daily moisture variation and the computations were compared to eddy-covariance method and equilibrium evaporation. The methods using soil moisture data can describe the variations of soil evaporation from eddy-covariance through simple moving average analysis. Method B showed a good matched with eddy-covariance method. This indicated that Dry Surface Layer (DSL) at 14:00 which was used for method B is important variable for the evaluation of soil evaporation. The total equilibrium evaporation was not significantly different to those of the others. However, equilibrium evaporation showed a problem in estimating soil evaporation because the temporal tendency of ��?????? was not related with the those of the other methods. The improved understanding of the soil evaporation presented in this study will contribute to the understandings of water cycles in a forest hillslope.
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KEYWORD
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Soil moisture, Soil evaporation, Equilibrium evaporation, Forested hillslope
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