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http://dx.doi.org/10.3741/JKWRA.2015.48.7.567

Flood Frequency Analysis Considering Probability Distribution and Return Period under Non-stationary Condition  

Kim, Sang Ug (Department of Civil Engineering, Kangwon National University)
Lee, Yeong Seob (Department of Civil Engineering, Kangwon National University)
Publication Information
Journal of Korea Water Resources Association / v.48, no.7, 2015 , pp. 567-579 More about this Journal
Abstract
This study performed the non-stationary flood frequency analysis considering time-varying parameters of a probability density function. Also, return period and risk under non-stationary condition were estimated. A stationary model and three non-stationary models using Generalized Extreme Value(GEV) were developed. The only location parameter was assumed as time-varying parameter in the first model. In second model, the only scale parameter was assumed as time-varying parameter. Finally, the both parameters were assumed as time varying parameter in the last model. Relative likelihood ratio test and Akaike information criterion were used to select appropriate model. The suggested procedure in this study was applied to eight multipurpose dams in South Korea. Using relative likelihood ratio test and Akaike information criterion it is shown that the inflow into the Hapcheon dam and the Seomjingang dam were suitable for non-stationary GEV model but the other six dams were suitable for stationary GEV model. Also, it is shown that the estimated return period under non-stationary condition was shorter than those estimated under stationary condition.
Keywords
flood frequency analysis; non-stationarity; return period; risk; GEV distribution;
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