特别是在与冲积物相比较时，河流沉积趋向于分选得很好，因为河流提供了较稳定的搬运作用。
Fluvial deposits tend to be well sorted, especially in comparison with alluvial deposits, because of the relatively steady transport provided by rivers.
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 extreme hypotheses is common law followed the self-adjusting mechanism of alluvial channels in riverbed evolution presently.
在一些强冲积性河流特别是河口区，由于洪水或洪水和潮流共同作用，河床的冲淤变化十分剧烈。
Due to the effect of flood or flood and tidal currents, in some strong alluvial river particular in estuary, the erosion in riverbed is severe.
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