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http://dx.doi.org/10.3741/JKWRA.2017.50.9.627

Estimating design floods in ungauged watersheds through regressive adjustment of flood quantiles from the design rainfall - runoff analysis method  

Chae, Byung-Seok (Department of Civil and Environmental Engineering, Hanyang University)
Lee, Jin-Young (Department of Civil and Environmental Engineering, Hanyang University)
Ahn, Jae-Hyun (Department of Civil and Architectural Engineering, Seokyeong University)
Kim, Tae-Woong (Department of Civil and Environmental Engineering, Hanyang University (ERICA))
Publication Information
Journal of Korea Water Resources Association / v.50, no.9, 2017 , pp. 627-635 More about this Journal
Abstract
It is required to estimate reliable design floods for hydraulic structures in order to respond more effectively to recent climate change. In this study, differences of design floods that were estimated the flood frequency analysis (FFA) and the design rainfall-runoff analysis (DRRA) were analyzed. In Korea, due to lack of measured flood data, the DRRA method is used in practice to determine the design floods. However, assuming the design floods estimated by the FFA as true values, the DRRA method over estimated the design floods by 79%. Thus, this study proposed a practical method to estimated design flood in ungauaged watersheds through regressive adjustment of flood quantiles estimated from the DRRA method. To this end, after investigating the differences between design floods acquired from the FFA and the DRRA method, nonlinear regression analyses were performed to develop the adjustment formulas for 8 large-dam watersheds. Applying the adjustment formula, the accuracy was improved by 65.0% on average over the DRRA method. In addition, when considering the watershed size, the adjustment formula increases the accuracy by 2.1%p on average over when not considering the watershed size.
Keywords
Adjustment formula; Flood frequency analysis; Design flood; Design rainfall;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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