Statistical Predictability Theory
The concepts of predictability and unpredictability have been widely used throughout the preceding chapters, and are one of the major ingredients in our definition of turbulence. When turbulence is examined from the point of view of “chaos” in dynamical systems, predictability is studied by looking at the sign of the Liapounov exponent l, with d(t) α e lt , where d(t) is an appropriate measure of the distance between two points representing the system and initially very close in phase space: a positive exponent means then an exponential separation, and implies loss of predictability.
KeywordsVortex Coherence Vorticity Sine
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