按河流演变的自然规律，黄河已达到其河床演变的临界值，很可能会再次改道。
In the natural river succession, the Yellow river course is in its critical situation and will probably change again.
这些足以说明，在自然状况下，河流演变在沙丘群和沙地形成演化中起着非常重要的促进作用。
Therefore, river evolution has very vital initiative and promoting effects on the formation and development of sand-dune groups and sandy land in natural conditions.
挟沙力沿河宽分布的变化是造成游荡型河道主流频繁摆动的主要原因之一，掌握其变化规律是研究游荡型河流演变规律的关键。
The law of sediment carrying capacity transverse distribution in braided river, which is the one of the key factors to research on the evolution rule of braided river, is presented.
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