Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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A Proposal of Unit Hydrograph Using Statistical Analysis in Oedo Stream, Jeju

통계적 기법을 적용한 외도천의 단위유량도 제안

  • Lee, Jun-Ho (Department of Civil Engineering, Jeju National University) ;
  • Yang, Sung-Kee (Department of Civil Engineering, Jeju National University) ;
  • Jung, Woo-Yul (Department of Civil Engineering, Jeju National University)
  • Received : 2015.01.14
  • Accepted : 2015.04.13
  • Published : 2015.04.30
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Abstract

Rainfall-runoff model of Jeju Oedo Stream was used to compute the optimal unit hydrograph by HEC-HMS model that reflecting on watershed characteristics. Each rainfall event was comparatively analyzed with the actual flow measurement using Clark, Snyder and SCS synthetic methods for derived unit hydrograph. Subsequently, the null hypothesis was established as p-value for peak flow and peak time of each unit hydrograph by one-way ANOVA(Analysis of variance) was larger than significance level of 0.05. There was no significant difference in peak flow and peak time between different methods of unit hydrograph. As a result of comparing error rate with actual flow measurement data, Clark synthetic unit graph best reflected in Oedo Stream as compared to other methods, and error rate of Clark unit hydrograph was 0.02~1.93% and error rate at peak time was 0~2.74%.

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