下荆江蜿蜒河道分形弯曲的物理机制探讨——Ⅱ.随机性

Explorations of the Physical Mechanism of Fractal Sinuosity of the Lower Jingjiang:Ⅱ: Randomness

河流水沙时间序列是随机过程,为探讨它们对蜿蜒河流分形结构形成和演变的影响,分析计算了这些随机过程的数值特征和涨落规律。研究发现,这些随机过程的涨落及二阶矩随时间变化的幂律振荡在下荆江这类蜿蜒河流分形结构的形成和演变中具有重要的调制作用。

River water and sediment time sequences are random processes .In order to study their effects on the formation and evolution of the fractal structure of the winding river ,the author calculates the numerical characteristics and the law of fluctuation of these random processes .The results show that the fluctuation and power law oscillation of the second moment changing with the time of these random processes play an important role in modulating the fractal structure in its formation and evolution of a meandering river such as the Lower Jingjiang .