Low-Flow Channel Variation and Effects of Grain Sorting due to Sediment Augmentation

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A sediment replenishment technology has been developed which involves the conveyance of part of the sediments excavated and/or dredged from reservoirs to the river below the corresponding dam. This technology has been implemented on a trial basis in several dam. However, this technique is in the development stage because there are many unknown factors. Therefore, systematic investigations are necessary in order to enable practical implementation and management of this technology. In this study, the effects of the location of replenished sediment on sediment flushing and on control of degradation are investigated by means of flume experiments and two-dimensional numerical simulations. The effects of grain size distribution (uniform and non-uniform sediments) on them are also discussed. The flushing process of replenishment sediments were investigated first, and then its effect on river bed degradation was analyzed.