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Soil Water Storage and Antecedent Precipitation Index at Gwangneung Humid-Forested Hillslope
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 Title & Authors
Soil Water Storage and Antecedent Precipitation Index at Gwangneung Humid-Forested Hillslope
Gwak, Yong-Seok; Kim, Su-Jin; Lee, Eun-Hyung; Hamm, Se-Yeong; Kim, Sang-Hyun;
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The temporal variation of soil water storage is important in hydrological modeling. In order to evaluate an antecedent wetness state, the antecedent precipitation index (API) has been used. The aim of this article is to compare observed soil water storage with APIs calculated by widely used four equations, to configure the relationship between soil water storage and API by a regression model for one-year(2009), and to predict the soil water storage for the next two years(2010~2011). The soil water storage was evaluated from the observed soil moisture dataset in soil depths of 10, 30, 60cm at 21 locations by TDR measurement system for 3 years. As a result, API with the exponential function among the four equations can describe the variation of the observed soil water storage. Monthly optimized parameters of the API's equations seemed to be roughly related with the (potential) evapotranspiration (PET). Using revised monthly optimized parameters of APIs considering the seasonal pattern of PET, we characterize the relationship between API and the observed soil water storage for one year, which looks better than those of other researches.
Soil moisture;Antecedent precipitation index (API);Soil storage;
 Cited by
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