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KMID : 1024520150240040393
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Journal of the Environmental Sciences
2015 Volume.24 No. 4 p.393 ~ p.401
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A Proposal of Unit Hydrograph Using Statistical Analysis in Oedo Stream, Jeju
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Lee Jun-Ho
Yang Sung-Kee
Jung Woo-Yul
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Abstract
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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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KEYWORD
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HEC-HMS, Clark, Snyder, SCS, One-way ANOVA, Unit hydrograph
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