connection between encounter volume and diffusivity in geophysical flows
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ID: 221625
2018
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Abstract
Trajectory encounter volume – the volume of fluid that passes close to a
reference fluid parcel over some time interval – has been recently
introduced as a measure of mixing potential of a flow. Diffusivity is the
most commonly used characteristic of turbulent diffusion. We derive the
analytical relationship between the encounter volume and diffusivity under
the assumption of an isotropic random walk, i.e., diffusive motion, in one
and two dimensions. We apply the derived formulas to produce maps of
encounter volume and the corresponding diffusivity in the Gulf Stream region
of the North Atlantic based on satellite altimetry, and discuss the mixing
properties of Gulf Stream rings. Advantages offered by the derived formula
for estimating diffusivity from oceanographic data are discussed, as well as
applications to other disciplines.
| Reference Key |
rypina2018nonlinearconnection
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|---|---|
| Authors | ;I. I. Rypina;S. G. Llewellyn Smith;L. J. Pratt |
| Journal | BMC research notes |
| Year | 2018 |
| DOI |
10.5194/npg-25-267-2018
|
| URL | |
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