arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1202.0350nlin.CDphysics.ao-ph
收藏

地球物理急流中的混沌混合和分形

Chaotic mixing and fractals in a geophysical jet current

M. V. Budyansky, S. V. Prants

摘要:

我们模型拉格朗日横向混合和被动标量在曲折的海洋急流的二维平流方程的运动流函数与时间相关的振幅的曲折强加。在这样一个模型中的平流被称为是混乱的曲流的特性在很大范围内。我们研究了随机层中的混沌输运,证明了它是反常的。混合的几何形状进行检查,并显示是分形的。散射特性(捕获时间的平流粒子和他们周围的椭圆点的旋转数)被发现有一个分层的分形结构作为初始粒子的位置的函数。建立了流动中物质线的演化与分形元素之间的对应关系。

英文摘要:

We model Lagrangian lateral mixing and transport of passive scalars in meandering oceanic jet currents by two-dimensional advection equations with a kinematic stream function with a time-dependent amplitude of a meander imposed. The advection in such a model is known to be chaotic in a wide range of the meander's characteristics. We study chaotic transport in a stochastic layer and show that it is anomalous. The geometry of mixing is examined and shown to be fractal-like. The scattering characteristics (trapping time of advected particles and the number of their rotations around elliptical points) are found to have a hierarchical fractal structure as functions of initial particle's positions. A correspondence between the evolution of material lines in the flow and elements of the fractal is established.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑