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http://dx.doi.org/10.3741/JKWRA.2021.54.6.419

Calculation of future rainfall scenarios to consider the impact of climate change in Seoul City's hydraulic facility design standards  

Yoon, Sun-Kwon (Department of Disasters Prevention Research, Seoul Institute of Technology)
Lee, Taesam (ERI, Department of Civil Engineering, Gyeongsang National University)
Seong, Kiyoung (ERI, Department of Civil Engineering, Gyeongsang National University)
Ahn, Yujin (ERI, Department of Civil Engineering, Gyeongsang National University)
Publication Information
Journal of Korea Water Resources Association / v.54, no.6, 2021 , pp. 419-431 More about this Journal
Abstract
In Seoul, it has been confirmed that the duration of rainfall is shortened and the frequency and intensity of heavy rains are increasing with a changing climate. In addition, due to high population density and urbanization in most areas, floods frequently occur in flood-prone areas for the increase in impermeable areas. Furthermore, the Seoul City is pursuing various projects such as structural and non-structural measures to resolve flood-prone areas. A disaster prevention performance target was set in consideration of the climate change impact of future precipitation, and this study conducted to reduce the overall flood damage in Seoul for the long-term. In this study, 29 GCMs with RCP4.5 and RCP8.5 scenarios were used for spatial and temporal disaggregation, and we also considered for 3 research periods, which is short-term (2006-2040, P1), mid-term (2041-2070, P2), and long-term (2071-2100, P3), respectively. For spatial downscaling, daily data of GCM was processed through Quantile Mapping based on the rainfall of the Seoul station managed by the Korea Meteorological Administration and for temporal downscaling, daily data were downscaled to hourly data through k-nearest neighbor resampling and nonparametric temporal detailing techniques using genetic algorithms. Through temporal downscaling, 100 detailed scenarios were calculated for each GCM scenario, and the IDF curve was calculated based on a total of 2,900 detailed scenarios, and by averaging this, the change in the future extreme rainfall was calculated. As a result, it was confirmed that the probability of rainfall for a duration of 100 years and a duration of 1 hour increased by 8 to 16% in the RCP4.5 scenario, and increased by 7 to 26% in the RCP8.5 scenario. Based on the results of this study, the amount of rainfall designed to prepare for future climate change in Seoul was estimated and if can be used to establish purpose-wise water related disaster prevention policies.
Keywords
Climate change; Annual maximum precipitation; Temporal disaggregation; Probable precipitation;
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