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http://dx.doi.org/10.3741/JKWRA.2009.42.9.725

Evaluation of Flood Severity Using Bivariate Gumbel Mixed Model  

Lee, Jeong-Ho (Dept of Civil and Environmental Eng., Hanyang Univ.)
Chung, Gun-Hui (Research Center for Disaster Prevention Science and Technology, Korea Univ.)
Kim, Tae-Woong (Dept. of Civil & Environmental System Eng., Hanyang Univ.)
Publication Information
Journal of Korea Water Resources Association / v.42, no.9, 2009 , pp. 725-736 More about this Journal
Abstract
A flood event can be defined by three characteristics; peak discharge, total flood volume, and flood duration, which are correlated each other. However, a conventional flood frequency analysis for the hydrological plan, design, and operation has focused on evaluating only the amount of peak discharge. The interpretation of this univariate flood frequency analysis has a limitation in describing the complex probability behavior of flood events. This study proposed a bivariate flood frequency analysis using a Gumbel mixed model for the flood evaluation. A time series of annual flood events was extracted from observations of inflow to the Soyang River Dam and the Daechung Dam, respectively. The joint probability distribution and return period were derived from the relationship between the amount of peak discharge and the total volume of flood runoff. The applicability of the Gumbel mixed model was tested by comparing the return periods acquired from the proposed bivariate analysis and the conventional univariate analysis.
Keywords
Gumbel mixed model; Bivariate flood frequency analysis; Flood evaluation;
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Times Cited By KSCI : 2  (Citation Analysis)
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