DIVERSION OF FLOOD FLOW ASSOCIATED WITH A LARGE AMOUNT OF SEDIMENT TRANSPORT INTO THE HII RIVER FLOODWAY AND MEASURES REDUCING INFLOW SEDIMENT DISCHARGE

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  • 大量の土砂を伴う洪水流の斐伊川放水路への分流と土砂流入抑制に関する研究

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 In the Hii River with braided channels, developments and deformations of sand waves during a flood affect flood flows and sediment transports. The Hii River floodway has a settling pond at the river bifurcation point for reducing sediment discharge to the downstream. For managements of the Hii River bifurcation section and the floodway, reduction of inflow sediment discharge into the floodway is required. The General Bottom Velocity Computation method was employed for computation of flood, which took account of time series of observed water surface profiles. We estimated flood discharges, bed variations and sediment transports in the river bifurcation section and the floodway during the flood of Sept. 2012. In addition, we propose reduction measures of inflow sediment discharge into the floodway.

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