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.
结合这些流场与泥沙计算方法及河床形态调整技术，作者提出一个准三维河流动力学模型。
Combining the computation of velocity field and sediment transportation with the adjusting technique of river geometry, a quasi_3D dynamic model for fluvial processes have been proposed.
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