Richardson law

Note that the Richardson law indicates a faster than diffusive separation and can also be interpreted as a scale dependent diffusion coefficient D = Ce1 v2 — r 114/3. A classic example of such length-scale dependent diffusivity is illustrated in the diagram by Okubo (1971), Fig 2.22, that is based on data from various experiments and observations on horizontal dispersion in oceanic flows. These data can be approximately described by a power law dependence of the form Deff(l) Z1-15. The deviation from the Richardson law can be seen as a consequence of the more complex structure of oceanic currents. 

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