Pair-particle separation statistics of drifters in tidal shallow water
Suara, Kabir Adewale, Brown, Richard, Chanson, Hubert, & Borgas, Michael (2016) Pair-particle separation statistics of drifters in tidal shallow water. In Ivey, G (Ed.) Proceedings of the 20th Australasian Fluid Mechanics Conference (AFMC). Australasian Fluid Mechanics Society, Australia, pp. 1-4.
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Description
In estuaries and natural water channels, the estimate of turbulent diffusivity is important to the modelling of scalar transport and mixing. Data from multiple deployments of low and high resolution clusters of GPS-drifters are used to examine dispersive behaviour of a small tidal estuary. Relative dispersion from pair-particle separation and finite scale Lyapunov exponents (FSLEs) are employed. Relative dispersion within the natural channel indicates weaker than Richardson’s power law exponent in the range of 1 – 2. The FLSE scales as λ ~ δ-2/3 in a small spatial scale range of δ ~ 2 – 10 m. The FSLE analysis suggests the presence of exponential dispersive behaviour, i.e. chaotic mixing at medium to large spatial scales. The results provide insights into accurately parameterizing unresolved mixing processes in typical tidal shallow bounded estuary.
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| ID Code: | 102342 | ||||
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| Item Type: | Chapter in Book, Report or Conference volume (Conference contribution) | ||||
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| Measurements or Duration: | 4 pages | ||||
| Event Title: | Australasian Fluid Mechanics Conference | ||||
| Event Dates: | 2016-12-05 - 2016-12-08 | ||||
| Event Location: | Perth, Australia | ||||
| Keywords: | Estuary, Field experiment, Lagrangian drifters, Lyaponuv exponent, Mixing and advection, Relative dispersion, Shear flow, Tide | ||||
| Pure ID: | 32992533 | ||||
| Divisions: | Past > Institutes > Institute for Future Environments Past > QUT Faculties & Divisions > Science & Engineering Faculty |
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| Copyright Owner: | Consult author(s) regarding copyright matters | ||||
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| Deposited On: | 12 Dec 2016 08:53 | ||||
| Last Modified: | 22 Apr 2026 22:09 |
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