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Selection of Unit Hydrograph in Sinheung Stream during Flood Season

  • Crisisonomy
  • Abbr : KRCEM
  • 2013, 9(3), pp.1-16
  • 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, a systematic and rational parameter of rainfall-runoff during the flood season was estimated using HEC-HMS (Hydrologic Engineering Center - Hydrologic Modeling System), a rainfall-runoff model, and unit hydrographs appropriate for the Sinheungcheon basin were selected. The initial parameter of Clark, SCS and Snyder hydrograph was estimated using an empirical formula commonly applied to domestic cases, and the curve number was estimated to be 81 in accordance with antecedent moisture condition-Ⅲ (AMC-Ⅲ). The optimized parameters were estimated by calibrating the parameters using the unit hydrograph on 2011 flood events, and the parameters 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), the statistical variance. From its results, errors of Snyder unit hydrograph were found to be generally smaller compared to those of other unit hydrographs. In addition, one-way ANOVA was conducted to determine the significance level of each unit hydrograph. According to the one-way (Analysis of Variance, ANOVA) results, each unit hydrograph showed no significant difference at a 5% significance level. It is expected that if measured flow rate data of high quality as well as optimized parameter and unit hydrograph selected is used, more reliable runoff volume can be simulated.

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