Fate of large-scale vortices in idealized tidal lagoons
| Autor: | Matthew D. Piggott, Carolanne V. M. Vouriot, Stephan C. Kramer, Athanasios Angeloudis |
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| Přispěvatelé: | Natural Environment Research Council (NERC), Engineering & Physical Science Research Council (EPSRC) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
DYNAMICS
Technology FLOW 0208 environmental biotechnology Tidal lagoons CIRCULATION Environmental Sciences & Ecology Geometry 02 engineering and technology HYDRODYNAMIC IMPACTS Mechanics Oceanography 01 natural sciences 09 Engineering 010305 fluids & plasmas Physics::Geophysics Physics::Fluid Dynamics RESOURCE 0103 physical sciences Meteorology & Atmospheric Sciences Environmental Chemistry Bathymetry 01 Mathematical Sciences Water Science and Technology geography Science & Technology 02 Physical Sciences geography.geographical_feature_category Vortices Vorticity Dissipation Environmental impacts Inlet Horizontal plane Tidal modeling 020801 environmental engineering Vortex MODEL Circulation (fluid dynamics) WATER-QUALITY Physical Sciences Water Resources Life Sciences & Biomedicine Environmental Sciences Geology Dimensionless quantity |
| Zdroj: | Vouriot, C V M, Angeloudis, A, Kramer, S C & Piggott, M D 2019, ' Fate of large-scale vortices in idealized tidal lagoons ', Environmental Fluid Mechanics, vol. 19, no. 2 . https://doi.org/10.1007/s10652-018-9626-4 |
| DOI: | 10.1007/s10652-018-9626-4 |
| Popis: | The generation and evolution of tidally-induced vortices in coastal and estuarine regions can influence water quality and sedimentary processes. These effects must be taken into consideration in the development of coastal reservoirs, barrages and lagoons, among other environmental flow applications. Results are presented here on the fate of large-scale vortices within confined tidally-forced domains. A computational approach is employed using the Thetis depth-averaged coastal ocean modeling framework. Initially, two test cases serve to demonstrate model capability in capturing the formation of dipoles downstream of oscillatory flow channels. Diagnostic quantities of vorticity and localized circulation are used to track the 2-D vortex evolution and dissipation. This approach is then applied to tidal lagoon geometries, where flows through the inlet induce a pair of counter rotating vortices (dipoles). Idealized model geometries and inlet conditions are used to determine the impact of three design parameters on large-scale vortical structures: (a) the lagoon geometry aspect ratio in the horizontal plane, (b) the inlet width and (c) the bathymetry profile as the coastline is approached. The dependence of vortex flushing behavior on the dimensionless ratio $${}^{W_\text{i}}\!/_{UT}$$ (where $$W_\text{i}$$ is the width of the inlet channel, U is the maximum velocity and T is the tidal period) is reaffirmed, while the side walls and the sloping bathymetry are found to affect the vortex dissipation process. |
| Databáze: | OpenAIRE |
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