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Accuracy Analysis of HEC-RAS for Unsteady Flow Simulation considering the Flow Pattern Variations over the Side-weir of Side-Weir Detention Basin
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 Title & Authors
Accuracy Analysis of HEC-RAS for Unsteady Flow Simulation considering the Flow Pattern Variations over the Side-weir of Side-Weir Detention Basin
Kim, Sanghyuk; Yoon, Byungman; Kim, Dongsu; Kim, Seojun;
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 Abstract
Accurate quantitative assessment of flood control effect of side-weir detention basin as a flood countermeasure was highly required, in which one-dimensional HEC-RAS model has been widely utilized in practice. When the submerged overflow occurred particularly driven by limited storage capacity of a given detention basin, HEC-RAS model could not be sufficiently applicable by guaranteeing acceptable accuracy without reliable benchmark dataset. From this perspective, a dedicated unsteady experiment was planned and carried out to physically realize such submerged overflow for accommodating better accuracy. Subsequently, the experimental results were applied to validate and calibrate HEC-RAS unsteady modeling to provide flood control effect of the detention basin for various inflow scenarios. After following this procedure, the modelled results indicated that there appeared within -5% of difference in stage height and maximum 2.4% accuracy to assess the flood control effect, thereby ensuring the calibrated HEC-RAS unsteady model to be accurate with practically acceptable error range.
 Keywords
HEC-RAS;unsteady flow experiment;side-weir detention basin;submerged overflow;error analysis;
 Language
Korean
 Cited by
 References
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