河床河岸地质结构对河流地质作用的制约主导着河道演变的趋势。
The restraint of geologic structure of river bed and bank on the rivers geologic action controls the river evolution trend.
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.
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