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Selection of Unit Hydrograph in Soyang Stream during Flood Season

  • Crisisonomy
  • Abbr : KRCEM
  • 2013, 9(4), pp.103-116
  • Publisher : Crisis and Emergency Management: Theory and Praxis
  • Research Area : Social Science > Public Policy > Public Policy in general

김형산 1,  Seungjin Maeng 1,  심지훈 1,  김태우 1

1충북대학교

Accredited

ABSTRACT

In this study, parameters and unit hydrograph appropriate for the watershed of Soyang stream were selected using the HEC-HMS (Hydrologic Engineering Center-Hydrologic Modeling System), which is a rainfall-runoff model. The initial parameters of each unit hydrograph were estimated using an empirical formula commonly applied to domestic cases. The curve number was estimated at 84 in accordance with the antecedent moisture condition -Ⅲ (AMC-Ⅲ). The areal rainfall on the watershed at the point of Samjungilgyo around Soyang stream was estimated using the Thiessen polygon method. The parameters by unit hydrograph were calibrated by selecting flood events in 2011, and these were verified using flood events in 2012. For the runoff volume simulated through calibration and verification, each unit hydrograph was evaluated using the Relative Root Mean Square Error (RRMSE) and the Relative Absolute Error (RAE). Based on the results, errors of Clark unit hydrograph turned out to be generally smaller compared to those of other unit hydrographs. In order to select the most appropriate unit hydrograph, an analysis of variance was carried out, and the results of one-way ANOVA showed that there was no significant difference at a 5% significance level. It is expected that if an analysis is conducted using measured flow data and appropriate parameters in the future, a highly reliable unit hydrograph is to be selected.

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