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Parameter Estimation of Unit Hydrograph for Derivation of Probable Maximum Flood

  • Crisisonomy
  • Abbr : KRCEM
  • 2013, 9(2), pp.147-162
  • Publisher : Crisis and Emergency Management: Theory and Praxis
  • Research Area : Social Science > Public Policy > Public Policy in general

Chae,Soo-Kwon 1 Maeng, Seung-jin 2 황주하 3 김태우 2 김형산 2

1을지대학교
2충북대학교
3평화엔지니어링

Accredited

ABSTRACT

In this study, optimum parameters of Unit Hydrograph for the systematic and reasonable derivation of PMF (probable Maximum Flood) were estimated using the HEC-HMS model as a rainfall-runoff model in Boryeong Dam watershed. As a result, the time of concentration was estimated to be 2.21 hr using the Kraven(Ⅱ) equation and the storage constant was estimated to be 1.92 using the Sabol equation. The CN was estimated to be 80 under AMC-Ⅲ as an antecedent moisture condition. The result of the sensitivity analysis was that the sensitivity of the time of concentration and storage constant was similar each showed a different parameter range. The experiment conditions were divided on time of concentration and storage constant, which affects the PMF regarding the Boryeong Dam watershed. In the HEC-HMS model, the optimum parameter value on the Clark Unit Hydrograph was estimated. The result using Maximum Unit Hydrograph was that the time of concentration was estimated to be 1.68 hr and the storage constant was estimated to be 1.49. Therefore, considering the recent onset of climate change, in designing large scale hydraulic, it is better to use PMF estimated based on the "Maximum Unit Hydrograph" concept under the time of concentration and storage constant condition.

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