Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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Application of a Non-stationary Frequency Analysis Method for Estimating Probable Precipitation in Korea

전국 확률강수량 산정을 위한 비정상성 빈도해석 기법의 적용

  • 김광섭 (경북대학교 건축토목공학부) ;
  • 이기춘 (경북대학교 건축토목공학부)
  • Received : 2012.07.05
  • Accepted : 2012.09.10
  • Published : 2012.09.30
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Abstract

In this study, we estimated probable precipitation amounts at the target year (2020, 2030, 2040) of 55 weather stations in Korea using the 24 hour annual maximum precipitation data from 1973 through 2009 which should be useful for management of agricultural reservoirs. Not only trend tests but also non-stationary tests were performed and non-stationary frequency analysis were conducted to all of 55 sites. Gumbel distribution was chosen and probability weighted moment method was used to estimate model parameters. The behavior of the mean of extreme precipitation data, scale parameter, and location parameter were analyzed. The probable precipitation amount at the target year was estimated by a non-stationary frequency analysis using the linear regression analysis for the mean of extreme precipitation data, scale parameter, and location parameter. Overall results demonstrated that the probable precipitation amounts using the non-stationary frequency analysis were overestimated. There were large increase of the probable precipitation amounts of middle part of Korea and decrease at several sites in Southern part. The non-stationary frequency analysis using a linear model should be applicable to relatively short projection periods.

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References

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  1. Non-Stationary Frequency Analysis of Future Extreme Rainfall using CMIP5 GCMs over the Korean Peninsula vol.18, pp.3, 2018, https://doi.org/10.9798/KOSHAM.2018.18.3.73