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KMID : 1024520210300080613
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Journal of the Environmental Sciences
2021 Volume.30 No. 8 p.613 ~ p.619
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Impacts of Initial Soil Moisture on Hydrologic Outflow in a Distributed FLO-2D Model
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Lee Khil-Ha
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Abstract
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Soil water enters the atmosphere via evapotranspiration, where it transforms into atmospheric water vapor and plays important role in the surface-atmosphere energy exchange. Soil conditions have a direct influence on the effective rainfall, and initial soil moisture conditions are important for quantitatively evaluating the effective rainfall in a watershed. To examine the sensitivity of the initial saturation to hydrologic outflow, a two-dimensional distributed FLO-2D hydrologic model was applied to a small watershed. The initial saturation was set to 0.3, 0.5, and 0.7 and the obtained results were compared. The Green-ampt model was chosen to calculate the penetration loss. Depending on the initial soil moisture, the peak flow rate varied by up to 60%, and the total water volume in the watershed by approximately 40%.
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KEYWORD
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Soil moisture, FLO-2D, Rainfall
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