Applying dynamical systems techniques to real ocean drifters
[摘要] This paper presents the first comprehensive comparison of several differentdynamical-systems-based measures of stirring and Lagrangian coherence,computed from real ocean drifters. Seven commonly used methods (finite-timeLyapunov exponent (FTLE), trajectory path length, trajectory correlation dimension,trajectory encounter volume, Lagrangian-averaged vorticity deviation,dilation, and spectral clustering) were applied to 144 surface drifters inthe Gulf of Mexico in order to map out the dominant Lagrangian coherentstructures. Among the detected structures were regions of hyperbolic natureresembling stable manifolds from classical examples, divergent andconvergent zones, and groups of drifters that moved more coherently andstayed closer together than the rest of the drifters. Many methodshighlighted the same structures, but there were differences too. Overall, fiveout of seven methods provided useful information about the geometry of transport within the domain spanned by the drifters, whereas the path length and correlation dimension methods were less useful than others.
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[效力级别] [学科分类] 自动化工程
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