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http://dx.doi.org/10.3741/JKWRA.2022.55.11.887

Multi parameter optimization framework of an event-based rainfall-runoff model with the use of multiple rainfall events based on DDS algorithm  

Yu, Jae-Ung (Department of Civil and Environmental Engineering, Sejong University)
Oh, Se-Cheong (Water Resources Facilities Maintenance Department, Korea Water Resources Corporation)
Lee, Baeg (Rural Research Institute of Korea Rural Community Corporation)
Kwon, Hyun-Han (Department of Civil and Environmental Engineering, Sejong University)
Publication Information
Journal of Korea Water Resources Association / v.55, no.11, 2022 , pp. 887-901 More about this Journal
Abstract
Estimation of the parameters for individual rainfall-rainfall events can lead to a different set of parameters for each event which result in lack of parameter identifiability. Moreover, it becomes even more ambiguous to determine a representative set of parameters for the watershed due to enhanced variability exceeding the range of model parameters. To reduce the variability of estimated parameters, this study proposed a parameter optimization framework with the simultaneous use of multiple rainfall-runoff events based on NSE as an objective function. It was found that the proposed optimization framework could effectively estimate the representative set of parameters pertained to their physical range over the entire watershed. It is found that the difference in NSE value of optimization when it performed individual and multiple rainfall events, is 0.08. Furthermore, In terms of estimating the observed floods, the representative parameters showed a more improved (or similar) performance compared to the results obtained from the single-event optimization process on an NSE basis.
Keywords
Rainfall-Runoff model; Parameter; Clark unit hydrograph; DDS algorithm;
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Times Cited By KSCI : 3  (Citation Analysis)
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