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Analysis of Characteristics for a Dividing Flow in Open Channels  

Park, Seong-Soo (한양대학교 대학원 건설환경공학과)
Lee, Jin-Woo (한양대학교 대학원 건설환경공학과)
Cho, Yong-Sik (한양대학교 공과대학 건설환경공학과)
Publication Information
Journal of the Korean Society of Hazard Mitigation / v.9, no.2, 2009 , pp. 53-57 More about this Journal
Abstract
The dividing flow in an open channel has a number of distinctive characteristics. One of these is that the separation zone interacts with a secondary motion along the inner wall of a branch channel, generating sediment accumulation. To investigate this phenomenon, a two-dimensional numerical model based on the shallow-water equations, RMA2, which calculates water surface elevations and horizontal-velocity components, was used to analyze the dividing flow. The obtained numerical results fully coincide with the laboratory measurements reported by Hsu et al.(2002). For the analysis of the numerical results, a separation zone-discharge rate relationship was proposed. To reduce the size of a separation zone, the topographies of diagonal and curved edges were proposed, smoothly connecting the upstream corner to branch channel.
Keywords
Dividing flow; Separation zone; RMA2; Shape factor;
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