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Flow Characteristics and Riverbed Changes Simulation for the Upstream and Downstream Sections of Gongju Bridge  

Shin, Kwang-Seob (공주대학교 대학원 건설환경공학과)
Jeong, Sang-Man (공주대학교 공과대학 건설환경공학부)
Lee, Joo-Heon (중부대학교 공과대학 토목공학부)
Song, Pum (대림산업(주))
Publication Information
Journal of the Korean Society of Hazard Mitigation / v.8, no.2, 2008 , pp. 119-127 More about this Journal
Abstract
The flow characteristics and the aspects of riverbed changes were analyzed for the upstream and downstream sections of Gongju Bridge. The upstream and downstream had complex topography, and the sections had the confluence of tributaries and several structures. In order to simulate the flow characteristics of the target sections, 1D HEC-RAS and 2D RMA2 were applied. As a result, the longitudinal water level of the target sections matched the results of simulated 1D and 2D samples. Also, 2D SED2D were applied to predict riverbed changes. As a result of the simulation, quantitative analysis was able to be performed for longitudinal riverbed changes from the sections of sudden change, bridges, the confluence of tributaries, and bends. Also, the distribution of riverbed changes on the main sections was in close relation to flow velocity. As a result of evaluating the sensitivity of SED2D, the concentration of suspended sediment, the thickness of sand beds, and the size of sand grains affected riverbed changes sensitively. These results will be used to apply the models of riverbed changes in the future.
Keywords
HEC-RAS; RMA2; SED2D; Riverbed changes; Sensitivity analysis;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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