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http://dx.doi.org/10.17663/JWR.2019.21.s-1.90

Estimation of Mega Flood Using Mega Rainfall Scenario  

Han, Daegun (Department of Civil Engineering, Inha university)
Kim, Deokhwan (Department of land, Water and Environment Research Korea institute of Civil Engineering and Building Technology(KICT))
Kim, Jungwook (Department of Civil Engineering, Inha university)
Jung, Jeawon (Department of Civil Engineering, Inha university)
Lee, Jongso (Korea Research Institute for Human Settlements)
Kim, Hung Soo (Department of Civil Engineering, Inha university)
Publication Information
Journal of Wetlands Research / v.21, no.spc, 2019 , pp. 90-97 More about this Journal
Abstract
In recent years, flood due to the consecutive storm events have been occurred and property damage and casualties are in increasing trend. This study calls the consecutively occurred storm events as a mega rainfall scenario and the discharge by the scenario is defined as a mega flood discharge. A mega rainfall scenario was created on the assumption that 100-year frequency rainfall events were consecutively occurred in the Gyeongancheon stream basin. The SSARR (Streamflow Synthesis and Reservoir Regulation) model was used to estimate the mega flood discharge using the scenario in the basin. In addition, in order to perform more reasonable runoff analysis, the parameters were estimated using the SCE_UA algorithm. Also, the calibration and verification were performed using the objective functions of the weighted sum of squared of residual(WSSR), which is advantageous for the peak discharge simulation and sum of squared of residual(SSR). As a result, the mega flood discharge due to the continuous occurrence of 100-year frequency rainfall events in the Gyeongan Stream Basin was estimated to be 4,802㎥/s, and the flood discharge due to the 100-year frequency single rainfall event estimated by "the Master Plan for the Gyeongancheon Stream Improvement" (2011) was 3,810㎥/s. Therefore, the mega flood discharge was found to increase about 992㎥/s more than the single flood event. The results of this study can be used as a basic data for Comprehensive Flood Control Plan of the Gyeongan Stream basin.
Keywords
Meteorological drought; Agricultural drought; Reservoir water storage rate; ROC analysis; SSARR; SCE_UA; WSSR;
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Times Cited By KSCI : 5  (Citation Analysis)
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