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http://dx.doi.org/10.3741/JKWRA.2022.55.9.701

Theoretical analysis of quantification of drought frequency inflow series via K-water cumulative difference method  

Kim, Jiheun (International School of Urban Sciences, University of Seoul)
Lee, Jae Hwang (Department of Civil & Environmental Eng., Seoul National University)
Kim, Young-Oh (Department of Civil & Environmental Eng., Seoul National University)
Publication Information
Journal of Korea Water Resources Association / v.55, no.9, 2022 , pp. 701-705 More about this Journal
Abstract
Reliable drought inflow scenarios are required to plan reservoirs in response to the present severe drought-like conditions. However, the previously developed method for generating drought inflows, the K-water cumulative difference method (KCM), is considered inadequate owing to its potential for negative inflow, reversal phenomena, and overestimation. Nevertheless, the occurrence of these aspects has not been theoretically analyzed. Hence, this study employed the quantile function and frequency factor for log-normal and Gumbel distributions to quantify the contributing factors of these limitations. Consequently, it was found that the negative inflows are generated when the difference in the location parameters, during the accumulation process, exceeds that of the scale parameters. In addition, as the standard deviation decrease during the accumulation process, the reversal phenomena, and inflated values prevailed.
Keywords
K-water cumulative difference method; Drought inflow; Drought frequency analysis; Quantile function; Frequency factor;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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