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(a) Run-1 (b) Run-2 Fig. 8 Bed relief Index (BRI) for each run had a greater effect on the bed, increasing the dynamics of the river channel. This study showed that a higher discharge enhanced the dynamics of the bed with the sediment supply upstream, and that the river was more dynamic at the downstream of the channel than in the immediate downstream of the dam, being affected more by the sediment supply. This study has some limitations to a review of the efficiency of the sediment supply method through a numerical simulation. A study on the actual implementation of the sediment supply method should be conducted in future research. ACKNOWLEDGEMENTS This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education (NRF-2017R1D1A1B03032083). REFERENCES [1] ASHIAD K., MICHUE M. Study on hydraulic resistance and bedload transport rate in alluvial streams, Proc., JSCE, 206, pp. 59-69. 1972 [2] BUNTE K. Gravel mitigation and augmentation below hydroelectric dams: a geomorphological perspective. Report to the Stream Systems Technology Center, USDA, Forest Service, Rocky Mountain Research Station, Fort Collins, CO. 2004. [3] CUI Y., PARKER G., LISLE T.E., GOTT J., HANSLER-BALL M.E., PIZZUTO J.E., ALLMENDINGER N., REED J.M. Sediment pulses in mountain rivers: 1. Experiments, Water Resour. Res., 39(9), 1239, doi:10.1029/2002WR001803. 2003. [4] GAEUMAN D. Mitigating downstream effects of dams. In Gravel-Bed Rivers: Processes, Tools, Environments, Church M, Biron P, Roy AG(eds), John Wiley and Sons: Chichester, 563. 2012. [5] HOEY T. B., SUTHERLAND A. J. Channel morphology and bedload pulses in braided rivers: A laboratory study. Earth Surf. Process. Landforms. Vol. 16, pp. 447-462. 1991. [6] IWASKI T., SHIMIZU Y., KIMURA I. Numerical simulation of bar and bank erosion in a vegetated floodplain: A case study in the Otofuke River, Advances in Water Resources, doi:10.1016/j.advwatres.2015.02.001. 2015. [7] JANG C.-L., SHIMIZU Y. Numerical simulation of relatively wide, shallow channels with erodible banks. Journal of Hydraulic Engineering, 131(7), pp. 565-575. 2005. 489