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Sensitivity Analysis of RMA2 Model Parameter Variation with Hydraulic Characteristics of Stream Junction Area
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 Title & Authors
Sensitivity Analysis of RMA2 Model Parameter Variation with Hydraulic Characteristics of Stream Junction Area
Ahn, Seung-Seop; Yim, Dong-Hee; Seo, Myung-Joon; Lee, Hyo-Jung;
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 Abstract
The purpose of this study is to analyze the sensitivity of the RMA2 model parameters reflecting the flow characteristics of stream junction and thus understand the hydraulic characteristics of the channel confluence flow. This study dealt with the input parameters of the RMA-2 model, a two-dimensional numerical analysis model widely used for researches both at home and abroad. The parameters of the RMA-2 model are roughness coefficient, turbulent diffusion coefficient, Coriolis forces latitude, Density, and mesh size. This study those parameters estimated from actual heavy rainfall, and varied the parameter size by (-)30%+30% to review the characteristics of the flow characteristics of the channel section. Weobserved that when the ratio of the channel width was relatively small, the smaller the approaching angle was, the farther from the junctions became the generating place of the maximum flow velocity, however, when the ratio of the channel width was relatively large, the larger the approaching angle was, the farther the generating place of the maximum flow velocity from the junctions became. In particular, the distance between junctions and the place where the maximum flow velocity generated showed an absolute correlationover 90% of the relative channel width, but an inverse relationwas found when the distance to the place where the flow velocity generated was shortened as relative the channel width between the main channel and tributary increased.
 Keywords
RMA2 model parameter variation;Sensitivity analysis;Hydraulic characteristics;Stream junction;
 Language
Korean
 Cited by
1.
하도 합류부의 정류.부정류해석에 따른 수리학적 변화 특성 분석,안승섭;임동희;박노삼;곽태화;

Journal of Environmental Science International, 2008. vol.17. 9, pp.957-968 crossref(new window)
2.
염분수지 및 EFDC 모형을 이용한 간척 담수화호 염도변화모의,성충현;

한국농공학회논문집, 2014. vol.56. 6, pp.139-147 crossref(new window)
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