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http://dx.doi.org/10.3741/JKWRA.2008.41.4.405

Regional Frequency Analysis of South Korean Rainfall Data Using FORGEX Method  

Kim, Jung-Won (Korea Environment & Resources Corporation, General Environmental Research Complex)
Nam, Woo-Sung (Dept. of Civil Engrg., Yonsei University)
Shin, Ju-Young (Dept. of Civil Engrg., Yonsei University)
Heo, Jun-Haeng (School of Civil & Environmental Engrg., Yonsei University)
Publication Information
Journal of Korea Water Resources Association / v.41, no.4, 2008 , pp. 405-412 More about this Journal
Abstract
Rainfall quantiles were estimated by applying the FORGEX method. The circle network and two elliptical ones with the ratios of 1 to 1.5 and 1 to 2.0 were used and compared to find appropriate one for rainfall data. Annual maximum data were collected from 376 sites and standardized by the median. The networks were organized from the subject sites and then pooled and netmax data were collected from each network. Then, the growth curves and quantiles were estimated. When the subject site had small differences of quantiles from index flood method and at-site frequency analysis, those of the estimated quantiles from circle and elliptical networks were small. In contrast, the sites where the quantile differences are big have big differences of quantiles from circle and elliptical networks. The estimated quantiles from the elliptical network are more accurate than those from the circle network, because the ellipse network contains more sites in South Korea. Moreover, the ellipse with ratio of 1 to 2.0 shows closer quantiles to those from index flood method than one with ratio of 1 to 1.5. It is, therefore, found that the FORGEX method with 1 to 2.0 ellipse network is appropriate regional frequency analysis in South Korea.
Keywords
FORGEX; netmax; network; regional frequency analysis; index flood method; at-site frequency analysis;
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