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http://dx.doi.org/10.3741/JKWRA.2022.55.4.257

Temporal distritution analysis of design rainfall by significance test of regression coefficients  

Park, Jin Heea (Department of Civil Engineering, Kumoh National Institute of Technology)
Lee, Jae Joon (Department of Civil Engineering, Kumoh National Institute of Technology)
Publication Information
Journal of Korea Water Resources Association / v.55, no.4, 2022 , pp. 257-266 More about this Journal
Abstract
Inundation damage is increasing every year due to localized heavy rain and an increase of rainfall exceeding the design frequency. Accordingly, the importance of hydraulic structures for flood control and defense is also increasing. The hydraulic structures are designed according to its purpose and performance, and the amount of flood is an important calculation factor. However, in Korea, design rainfall is used as input data for hydrological analysis for the design of hydraulic structures due to the lack of sufficient data and the lack of reliability of observation data. Accurate probability rainfall and its temporal distribution are important factors to estimate the design rainfall. In practice, the regression equation of temporal distribution for the design rainfall is calculated using the cumulative rainfall percentage of Huff's quartile method. In addition, the 6th order polynomial regression equation which shows high overall accuracy, is uniformly used. In this study, the optimized regression equation of temporal distribution is derived using the variable selection method according to the principle of parsimony in statistical modeling. The derived regression equation of temporal distribution is verified through the significance test. As a result of this study, it is most appropriate to derive the regression equation of temporal distribution using the stepwise selection method, which has the advantages of both forward selection and backward elimination.
Keywords
Huff's temporal distribution; Polynomial regression equation; Stepwise selection; Principle of modeling parsimony;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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