从宏观规律入手，采用概化方法研究了蜿蜒性河流的演变机理。在观察分析蜿蜒性河流演变规律的基础上，提出了弯曲河流的演变过程，即河流演变初期表现为沿轴线左右摆动，因受柯氏力的影响轴线逐渐弯曲，由于摆幅的增大和轴线曲率半径减小，使河流呈现出由顺直-微弯-蜿蜒-裁弯的演变过程。

On the basis of observing and analyzing the data of evolution of meandering rivers, the process of river evolution was studied from macroscopic view in generalized condition. It is discovered that a river occurs to waver along a river axis at initial stage, then the axis bends gradually;due to Coriolis Force action, the center of curvature is usually located at the south side of the river and the bending reach of south side develops quicker than its north side;as a result, the bending radius of axis reduces and wavering extent increases, thus the typical evolution process must be developed gradually from straight stream→tiny bending river→meandering river and to cut-off finally.