冲积河型形成条件的探讨

水流塑造河槽 ,河槽约束水流是河流演变的基本特点。本文分析了河槽形态与河流弯曲率的关系 ,结果表明弯曲率大的河流都具有窄深河槽 ,宽浅河流总是顺直的。河槽横断面形态对河流的演变过程起到了控制作用 ,是河流形成不同的平面形态的必要条件。不同的水沙组合虽然相差很大 ,但只要形成窄深河槽就可能发展成弯曲河流。

Discussion on Forming Conditions of the Alluvial River Patterns

It is a general frame of fluvial process that flows form river channels and the channels are constrained by flows. The relationship between river patterns and river bend curvatures shows that rivers with large bend curvatures are of narrow and deep channels and those with shallow and wide channels are always straight. Therefore, a cross-sectional shape of the river channel determines the plan form of river. Although bigger difference is observed in the different combinations of water and sediment, a meandering channel may be developed so long as a narrow and deep channel is formed.