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2022 Vol.55, Issue 3

Research Article

Application of a large-scale ensemble climate simulation database for estimating the extreme rainfall

극한강우량 산정을 위한 대규모 기후 앙상블 모의자료의 적용

Youngkyu Kima*
,
Minwoo Sonb
김 영규a*
,
손 민우b
aResearcher, Department of Civil Engineering, Chungnam National University, Daejeon, Korea
bProfessor, Department of Civil Engineering, Chungnam National University, Daejeon, Korea
a충남대학교 토목공학과 연구원
b충남대학교 토목공학과 교수
*Corresponding Author
31 March 2022. pp. 177-189
PDF XML Citation
Abstract

The purpose of this study is to apply the d4PDF (Data for Policy Decision Making for Future Change) constructed from a large-scale ensemble climate simulation to estimate the probable rainfall with low frequency and high intensity. In addition, this study analyzes the uncertainty caused by the application of the frequency analysis by comparing the probable rainfall estimated using the d4PDF with that estimated using the observed data and frequency analysis at Geunsam, Imsil, Jeonju, and Jangsu stations. The d4PDF data consists of a total of 50 ensembles, and one ensemble provides climate and weather data for 60 years such as rainfall and temperature. Thus, it was possible to collect 3,000 annual maximum daily rainfall for each station. By using these characteristics, this study does not apply the frequency analysis for estimating the probability rainfall, and we estimated the probability rainfall with a return period of 10 to 1000 years by distributing 3,000 rainfall by the magnitude based on a non-parametric approach. Then, the estimated probability rainfall using d4PDF was compared with those estimated using the Gumbel or GEV distribution and the observed rainfall, and the deviation between two probability rainfall was estimated. As a result, this deviation increased as the difference between the return period and the observation period increased. Meanwhile, the d4PDF reasonably suggested the probability rainfall with a low frequency and high intensity by minimizing the uncertainty occurred by applying the frequency analysis and the observed data with the short data period.

Keywords
d4PDF data
A large-scale ensemble climate simulations
Probable rainfall
Frequency analysis
Return period

본 연구는 저빈도·고강도의 확률강우량 산정을 위해, 대규모 기후 앙상블 모의실험으로 생성된 d4PDF (Data for Policy Decision Making for Future Change)를 적용하는 것을 목적으로 수행되었다. 또한, d4PDF를 이용하여 산정된 확률강우량과 관측 자료 및 빈도해석을 통해서 산정된 확률강우량을 비교함으로써 빈도해석 과정의 적용에 따라 발생하는 불확실성을 분석하였다. 이와 같은 연구는 금산, 임실, 전주, 장수 관측소를 대상으로 수행되었다. d4PDF 자료는 총 50개의 앙상블로 구성되어있으며, 하나의 앙상블은 60년동안의 기상자료를 제공하기 때문에 한 지점에서 3,000개의 연 최대 일 강우량을 수집하는 것이 가능했다. 이와 같은 d4PDF의 특징을 토대로 본 연구는 빈도해석 방법을 적용하지 않고, 3000개의 연 최대 일 강수량을 비모수적 접근법(Non-parametric approach)에 따라 규모별로 나열하여, 10년부터 1000년의 재현기간을 갖는 확률강우량을 산정했다. 그 후, 관측 자료와 Gumbel 및 GEV (General extreme value) 분포를 토대로 산정된 확률강우량과의 편차를 산정하였다. 그 결과, 재현기간과 관측 기간의 차이가 증가할수록 이 편차가 증가하였으며, 이 결과는 짧은 관측 기간과 빈도해석의 적용은 재현기간이 증가할수록 신뢰하기 어려운 확률강우량을 제시한다는 것을 의미한다. 반면에, d4PDF는 대규모 표본을 이용함으로써 이와 같은 불확실성을 최소화시켜 합리적인 저빈도·고강도의 확률강우량을 제시하였다.

키워드
d4PDF
대규모 기후 앙상블 모의실험
확률강우량
빈도해석
재현기간
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Information
  • Publisher :KOREA WATER RESOURECES ASSOCIATION
  • Publisher(Ko) :한국수자원학회
  • Journal Title :Journal of Korea Water Resources Association
  • Journal Title(Ko) :한국수자원학회 논문집
  • Volume : 55
  • No :3
  • Pages :177-189
  • Received Date : 2021-10-21
  • Revised Date : 2022-01-13
  • Accepted Date : 2022-01-27
  • DOI :https://doi.org/10.3741/JKWRA.2022.55.3.177
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