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http://dx.doi.org/10.3741/JKWRA.2021.54.11.955

Regionalization of rainfall-runoff model parameters based on the correlation of regional characteristic factors  

Kim, Jin-Guk (Department of Hydro Science and Engineering Research, Korea Institute of Civil Engineering and Building Technology)
Sumyia, Uranchimeg (Department of Civil and Environmental Engineering, Sejong University)
Kim, Tae-Jeong (Planning & Management Division, Korea Institute of Hydrological Survey)
Kwon, Hyun-Han (Department of Civil & Environmental Engineering, Sejong University)
Publication Information
Journal of Korea Water Resources Association / v.54, no.11, 2021 , pp. 955-968 More about this Journal
Abstract
A water resource plan is routinely based on a natural flow and can be estimated using observed streamflow data or a long-term continuous rainfall-runoff model. However, the watershed with the natural flow is very limited to the upstream area of the dam. In particular, for the ungauged watershed, a rainfall-runoff model is established for the gauged watershed, and the model is then applied to the ungauged watershed by transferring the associated parameters. In this study, the GR4J rainfall-runoff model is mainly used to regionalize the parameters that are estimated from the 14 dam watershed via an optimization process. In terms of optimizing the parameters, the Bayesian approach was applied to consider the uncertainty of parameters quantitatively, and a number of parameter samples obtained from the posterior distribution were used for the regionalization. Here, the relationship between the estimated parameters and the topographical factors was first identified, and the dependencies between them are effectively modeled by a Copula function approach to obtain the regionalized parameters. The predicted streamflow with the use of regionalized parameters showed a good agreement with that of the observed with a correlation of about 0.8. It was found that the proposed regionalized framework is able to effectively simulate streamflow for the ungauged watersheds by the use of the regionalized parameters, along with the associated uncertainty, informed by the basin characteristics.
Keywords
Rainfall-runoff model; GR4J; Regionalization; Uncertainty;
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Times Cited By KSCI : 3  (Citation Analysis)
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