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http://dx.doi.org/10.3741/JKWRA.2004.37.9.707

An Analysis of PMF and Critical Duration for Design of Hydraulic Structure  

Lee, Sang-Jin (한국수자원공사 수자원연구원)
Choi, Hyun (부산대학교 공과대학 생산기술연구소)
Shin, Hee-beom (삼안건설기술공사 수자원사업부)
Park, Sang-Kil (부산대학교 공과대학 토목공학과)
Publication Information
Journal of Korea Water Resources Association / v.37, no.9, 2004 , pp. 707-718 More about this Journal
Abstract
This study is to analyze the Probable Maximum Flood(PMF) as a part of counterplan for the disaster prevention of hydraulic structures such as dams, according to recent unfavorable weather conditions. During the period of typhoon RUSA in August 2002, the rainfall recorded in Gang-loeng Province was 880mm a day and exceeded the scale of PMP made in 2001. Accordingly, the reconsideration of hydrologic criteria for dam design was inevitable. In the design of dams for flood controls, the design flood must be determined by introducing the concept of maximum values. When the duration of design rainfall is determined, it needs to use the critical duration which causes the maximum flood by the maximum runoff. In this study, we Investigate the variation of critical duration with hydrologic parameters used in three different synthetic unit hydrographs(Clark, Nakayasu and SCS methods). As a result, the total runoff calculated from 24-hour duration is larger than that calculated from the critical duration. We calculate also the hydrographs with three different time distribution models(Huff's 4-quartile, IDF curve and Mononobe) and compare those with measured hydrograph data. From this comparison, we propose that the Huff's 4-quartile model must be used to obtain the desirable data in the hydrologic design of dams.
Keywords
PMP; PMF; critical duration; time distribution model; unit hydrograph;
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Times Cited By KSCI : 1  (Citation Analysis)
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