Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv

Jeon, Myeonho

Kim, Tae-Wong

Shin, Ji-Yae

English

Hydraulic Engineering Repository

Conference Paper, Published VersionShin, Ji-Yae; Jeon, Myeonho; Kim, Tae-WongNon-Stationarity of Streamflow in South Korea: Focus onthe Effect on Flood FrequencyZur Verfügung gestellt in Kooperation mit/Provided in Cooperation with:Kuratorium für Forschung im Küsteningenieurwesen (KFKI)Verfügbar unter/Available at: https://hdl.handle.net/20.500.11970/109806Vorgeschlagene Zitierweise/Suggested citation:Shin, Ji-Yae; Jeon, Myeonho; Kim, Tae-Wong (2012): Non-Stationarity of Streamflow inSouth Korea: Focus on the Effect on Flood Frequency. In: Hagen, S.; Chopra, M.; Madani,K.; Medeiros, S.; Wang, D. (Hg.): ICHE 2012. Proceedings of the 10th InternationalConference on Hydroscience & Engineering, November 4-8, 2012, Orlando, USA.Standardnutzungsbedingungen/Terms of Use:Die Dokumente in HENRY stehen unter der Creative Commons Lizenz CC BY 4.0, sofern keine abweichendenNutzungsbedingungen getroffen wurden. Damit ist sowohl die kommerzielle Nutzung als auch das Teilen, dieWeiterbearbeitung und Speicherung erlaubt. Das Verwenden und das Bearbeiten stehen unter der Bedingung derNamensnennung. Im Einzelfall kann eine restriktivere Lizenz gelten; dann gelten abweichend von den obigenNutzungsbedingungen die in der dort genannten Lizenz gewährten Nutzungsrechte.Documents in HENRY are made available under the Creative Commons License CC BY 4.0, if no other license isapplicable. Under CC BY 4.0 commercial use and sharing, remixing, transforming, and building upon the materialof the work is permitted. In some cases a different, more restrictive license may apply; if applicable the terms ofthe restrictive license will be binding.The 10th Int.  Conf. on Hydroscience and Engineering (ICHE-2012), Nov. 4 – Nov. 8, Orlando, FL, USA  19       NON-STATIONARITY OF STREAMFLOW IN SOUTH KOREA: FOCUS ON THE EFFECT ON FLOOD FREQUENCY   Ji-Yae Shin1, Myeonho Jeon2, and Tae-Wong Kim3   In South Korea, hydro-climatic disasters including localized heavy storms, typhoons, and flooding are a main concern every rainy season. During the last decades, the average annual rainfall increases 9.1% compared to the long-term average during the last 30 years. Especially, the localized convective heavy storms result in rapid flood in urban areas across South Korea, leading to serious damages in both life and property. Due to the lack of discharge data, nonstationary rainfall frequency analysis, as shown in Figure 1, is sometimes employed to derive design floods under the nonstationary condition.   1972 1976 1980 1984 1988 1992 1996 2000 2004 2008Year50100150200250300Rainfall(mm)Geochang(D=24hr)ObservationsLinear FitY=2.127X-4092.0R2=0.2434    10 10020 30 50 200Return Period (Year)200240280320360400Rainfall(mm)Geochang (D=24hr)SGM(2008)CI of SGM(2008)NSGM(2020)NSGM(2030)NSGM(2040)NSGM(2050)                                              (a)                                                                           (b)   Figure 1 Annual maximum rainfalls (a) and nonstationary rainfall frequency curves at Geochang station in South Korea (Seo et al., 2012).  Nowadays gradually over 30 years discharge data are accumulated at several gauging stations in South Korea which motivates us to develop a statistical scheme to appropriate design floods under the changing world.  This study focuses on identifying the non-stationarity in the streamflow measured in large river basin in South Korea due to climate change and variability. The steamflow data were collected from four large dams, as listed in Table 1, in South Korea. Changes of statistics such as mean and variance of observed streamflows and significant linear and/or nonlinear trend embedded in observations are identified through various statistical testing methods.  Table 1 Basic information of multi-purpose large dams in South Korea (Lee et al., 2011).                                                  1 Graduate Research Assistant, Department of Civil and Environmental Engineering, Hanyang University, Seoul, 133-791, Korea (email: jiyaeshin@naver.com) 2 Graduate Research Assistant, Department of Civil and Environmental Engineering, Hanyang University, Seoul, 133-791, Korea (email: dektol79@gmail.com) 3 Corresponding Author, Associate Professor, Department of Civil and Environmental Engineering, Hanyang University, Ansan, 426-791, Korea (email: twkim72@hanyang.ac.kr) The 10th Int.  Conf. on Hydroscience and Engineering (ICHE-2012), Nov. 4 – Nov. 8, Orlando, FL, USA  20   Name of Dam River Const' Period Watershed Area(㎢) Scale of Watershed ① Chungju Han River ‘78~‘86 6,648.0  Large Scale (1,500㎢ ~) ② Daecheong Guem River ‘75~‘81 4,134.0  ③ Soyanggang Han River ‘67~‘73 2,703.0  ④ Namgang Nakdong River ‘87~‘03 2,285.0  ⑤ Andong Nakdong River ‘71~‘77 1,584.0  ⑥ Imha Nakdong River ‘84~‘93 1,361.0  Medium Scale (500~1,500㎢) ⑦ Juam Seomjin River ‘84~‘92 1,010.0  ⑧ Yongdam Guem River ‘90~‘06 930.0  ⑨ Hapcheon Nakdong River ‘82~‘89 925.0  ⑩ Seomjingang Seomjin River ‘61~‘66 763.0  ⑪ Hoengseong Han River ‘90~‘02 209.0  Small Scale (~ 500㎢) ⑫ Boryeong Others ‘90~‘00 163.6  ⑬ Juam Regulation Seomjin River ‘84~‘96 134.6  ⑭ Milyang Nakdong River ‘90~‘02 95.4  ⑮ Buan Others ‘90~‘96 59.0   In addition, the effect of the non-stationarity of observed streamflows in the frequency of flood is investigated in this study. This study expects that extreme floods have similar tendency of non-stationary to precipitation data which is already reported in many studies, as shown in Figure 1 and 2.    REFERENCES  Lee, J. H., Lee, J.-K., and Kim, T.-W. (2011) “Comparative study on calculation method for design flood discharge of dam”, Journal of Korea Water resources Association, Vol. 44, No. 12, pp.941-954. Seo, L., Kim, T.-W., Choi, M., and Kwon, H.-H. (2012) “Constructing rainfall depth-frequency curves considering a linear trend in rainfall observations”, Stochastic Environmental Research and Risk Assessment, DOI 10.1007/s00477-011-0549-6. 

Non-Stationarity of Streamflow in South Korea: Focus on the Effect on Flood Frequency

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Non-Stationarity of Streamflow in South Korea: Focus on the Effect on Flood Frequency

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