Author(s): Chang-Lae Jang; Tae Hye Baek

Linked Author(s): Chang-Lae Jang

Keywords: Numerical simulation; Unsteady flow; Phase lag; Bed deformation; Bar migration speed

Abstract: In this study, a two-dimensional numerical model (Nays2DH) was applied to analyze the process of morphological changes in the river channel bed depending on the changes in the amount of flooding after fully opening the Sejong weir, which was constructed upstream of the Geum River. For this, numerical simulations were performed by assuming the flow conditions, such as a non-uniform flow(NF), unsteady flows (single flood event, SF), and a continuous flood event(CF). Here, in the cases of the SF and CF, the normalized hydrograph was calculated from real flood events, and then the hydrograph was reconfigured by the peak flow discharge according to the scenario, and then it was employed as the flow discharge at the upstream boundary condition. To quantitatively evaluate the morphological changes, we analyzed the time changes in the bed

DOI: https://doi.org/10.64697/iahr.proc.ise2026.abs.128

Year: 2026