river-bed scouring 河床冲刷
river bed scouring 河床变形
river bed scouring-siltation 河床冲淤
The test results show that the apron can reduce back flow at the dam toe, and the piers can obviously diminish river bed scouring near the scour resistant wall.
试验结果表明：护坦减轻了下游纵向围堰左侧坝趾处的回流淘刷，隔流墩明显减轻了防冲墙附近河床的冲刷，确保了坝基和下游纵向围堰的安全。
The scouring the river bed before the Three Gorges Dam with high head and huge discharge has been given a special attention.
三峡工程水头高，流量大，下游河床冲刷成为人们的关注点。
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