Question about Lagrangian Coherent Structures (LCS)

[ATY]

Has somebody a paper, text, (whatever), which explains the Lagrangian Coherent Structures ? I want an explanation by words and not all the mathematical stuff. All I can find about LCS is
1. They organize flow
2. you can detect them with the Lyapunov exponents.

But I want to understand what LCS are and why people care about them.
I hope that somebody can help me.
best wishes
ATY

PS: I have no clue if this is the right part of the forum to ask this question.

 

[Valerie Park]

The concept of Lagrangian Coherent Structures (LCS) was introduced in the late 2000s as a tool to analyze fluid flows. The basic idea behind LCS is that they are structures in the flow which remain coherent, or roughly speaking, remain in the same place, over long timescales. This is in contrast to the more traditional approach of analyzing fluid flows, which looks at the instantaneous structure of the flow at a given time.LCS can be used to identify the preferred pathways through which particles move within a flow. This is particularly useful for applications such as tracking the movement of ocean eddies, understanding the formation and evolution of tornadoes, or quantifying the transport of pollutants in the atmosphere.LCS can be detected using several methods, such as the Finite Time Lyapunov Exponent (FTLE) technique. The FTLE method identifies regions in a fluid flow where fluid particles move away from each other most quickly. These regions are then identified as the locations of LCS.