The extreme hypotheses is common law followed the self-adjusting mechanism of alluvial channels in riverbed evolution presently.
冲积河流的自我调整作用所遵循的规律，目前在河床演变学中比较常用的是极值假说。
The productive embankments on the watercourse bottomland disturb the water-sediment lateral exchange between bottomland and main flume, which have great influence on the riverbed evolution.
河道主槽两侧修建的生产堤影响滩槽泥沙横向交换，对河床演变带来很大影响。
Evolution characteristics of riverbed in fluctuating backwater area.
变动回水区河床演变特性。
The relationship between the particular features of scouring and deposition of riverbed and evolution of ice jam in He-qu Reach has been obtained.
总结出冰塞河段的河床演变特点与冰塞演变的相互关系，得出了河床冲淤及水内冰堆积计算的经验关系式及河床冲淤平衡的临界水力参数。
The relationship between the particular features of scouring and deposition of riverbed and evolution of ice jam in He-qu Reach has been obtained.
总结出冰塞河段的河床演变特点与冰塞演变的相互关系，得出了河床冲淤及水内冰堆积计算的经验关系式及河床冲淤平衡的临界水力参数。
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