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http://dx.doi.org/10.3741/JKWRA.2013.46.9.921

Spatial Extension of Runoff Data in the Applications of a Lumped Concept Model  

Kim, Nam Won (Hydrology Research Div., Korea Institute of Construction Technology)
Jung, Yong (Hydrology Research Div., Korea Institute of Construction Technology)
Lee, Jeong Eun (Hydrology Research Div., Korea Institute of Construction Technology)
Publication Information
Journal of Korea Water Resources Association / v.46, no.9, 2013 , pp. 921-932 More about this Journal
Abstract
Runoff data availability is a substantial factor for precise flood control such as flood frequency or flood forecasting. However, runoff depths and/or peak discharges for small watersheds are rarely measured which are necessary components for hydrological analysis. To compensate for this discrepancy, a lumped concept such as a Storage Function Method (SFM) was applied for the partitioned Choongju Dam Watershed in Korea. This area was divided into 22 small watersheds for measuring the capability of spatial extension of runoff data. The chosen total number of flood events for searching parameters of SFM was 21 from 1991 to 2009. The parameters for 22 small watersheds consist of physical property based (storage coefficient: k, storage exponent: p, lag time: $T_l$) and flood event based parameters (primary runoff ratio: $f_1$, saturated rainfall: $R_{sa}$). Saturated rainfall and base flow from event based parameters were explored with respect to inflow at Choongju Dam while other parameters for each small watershed were fixed. When inflow of Choongju Dam was optimized, Youngchoon and Panwoon stations obtained average of Nash-Sutcliffe Efficiency (NSE) were 0.67 and 0.52, respectively, which are in the satisfaction condition (NSE > 0.5) for model evaluation. This result is showing the possibility of spatial data extension using a lumped concept model.
Keywords
runoff data; spatial extension; lumped concept model;
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Times Cited By KSCI : 4  (Citation Analysis)
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