Author(s): Robert H. A. Janssen; Hsieh Wen Shen

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Abstract: Hydraulic flushing and sediment-pass-through have been proposed as ways of preserving reservoir storage capacity. Both require full reservoir drawdown using low-level outlets, leading to incision of a flushing channel in the sediment bed. In wide reservoirs, the flushing channel slope and width vary along its length. Three stages of channel widening and incision during reservoir drawdown were identified from a physical model. Initially, when the water surface slope is small, little erosion and channel widening occurs. Then, when the flow through the reservoir achieves riverine conditions, the flushing channel widens and incises rapidly. Finally, when the flow through the reservoir is confined to the flushing channel, the channel incises more slowly into the sediment bed, and widens intermittently by bank failure processes.

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Year: 1997