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Basin-scale PMF Estimation by Considering Spatio-temporal Characteristics : Focused on Yongdam-dam Basin

Youngkyu Kim ORD ID 1,  YU WANSIK 2,  Kim, Yeonsu 3,  Anchul Jeong 1,  Jung, Kwansue ORD ID 1

1충남대학교
2충남대학교 국제수자원연구소
3한국수자원공사

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ABSTRACT

This study aims to estimate a basin-scaled Probable Maximum Flood(PMF) by considering both spatial-temporal characteristics of rainfall. Apart from that, the comparison of the PMF calculated from both using conventional approaches and the methodology suggested in this study were performed. The PMF is the theoretical maximum flood that poses extreme threats to the flood control of a project, in a design watershed. It is noted that the characteristics of heavy rainfall are difficult to be identified, as the directions of rainfall propagation are difficult to be recognized. Therefore, in contrast to conventional approaches, a rainfall analysis approach which considers both spatial and temporal characteristics of rainfall has been adopted to estimate the PMF for the watershed. The results indicated that the PMF estimated by considering the spatial-temporal characteristics of rainfall was lower as compared to the PMF estimated from using conventional approaches. However, it was also found that the results, from using the suggested methodology in this study, were higher as compared to the 200-year flood frequency discharge. It can be concluded that application of the spatial-temporal considered PMF estimation approach suggested in this study may prevent the over estimation of PMF for future studies.

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