A model of tidal flushing of an estuary by dipole formation

Wells, Mathew G.; Heijst, GertJan F. van

doi:10.1016/j.dynatmoce.2003.08.002

Cited by 59 publications

(87 citation statements)

References 31 publications

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“…Hydrodynamic model studies (Dale et al 2011) show the Race forming a 'vortex pair' of counterrotating eddies at its advancing head (Fig. 2;Fujiwara et al 1994, Old & Vennell 2001, Wells & van Heijst 2003. These eddies track westwards in deep water (~200 m) but largely stall as they encounter shoaling topography (~50 m) southwest of the Garvellach islands ( Figs.…”

Section: Study Sitementioning

confidence: 99%

Riding the tide: use of a moving tidal-stream habitat by harbour porpoises

Benjamins

Dale²,

Geel³

et al. 2016

Mar. Ecol. Prog. Ser.

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Tidal-stream habitats present periodically fast-flowing, turbulent conditions. Evidence suggests that these conditions benefit top predators such as harbour porpoises Phocoena phocoena, presumably allowing them to optimise exploitation of prey resources. However, clear demonstration of this relationship is complicated by the fact that strong tidal flows often occur near-simultaneously across a wide area. The Great Race of the Gulf of Corryvreckan (western Scotland, UK) is a jetting tidal system where high-energy conditions persist across a broad range of tidal phases in a localised, moving patch of water. Porpoises can therefore actively enter or avoid this habitat, facilitating study of their usage of adjacent high-and low-energy environments. The distribution of harbour porpoises was studied using passive acoustic porpoise detectors (C-PODs) deployed on static moorings (~35 d) and on Lagrangian drifters moving freely with the current (up to ~48 h). This dual approach provided complementary perspectives on porpoise presence. C-PODs moored in the path of the Great Race registered a significant increase in detections during the passing of the energetic tidal jet. Encounter durations recorded by drifting C-PODs were longer than those recorded by moored C-PODs, suggesting that porpoises tended to move downstream with the flow rather than remaining stationary relative to the seabed or moving upstream. The energetic, turbulent conditions of the Great Race are clearly attractive to porpoises, and they track its movement with time; however, their structured movements in response to the evolving tidal situation cannot simply be represented as a direct relationship between current speed and porpoise presence.

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Section: Study Sitementioning

confidence: 99%

Riding the tide: use of a moving tidal-stream habitat by harbour porpoises

Benjamins

Dale²,

Geel³

et al. 2016

Mar. Ecol. Prog. Ser.

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“…Vortex dipoles are hydrodynamic structures composed of two aggregated counter-rotating vortices that are observed in geophysical flows such as tidal estuaries (Fujiwara et al 1994;Wells and van Heijst 2003) or rip currents (Smith and Largier 1995;Peregrine 1998). The transport of pollutants or sediments by such structures is a critical environmental issue in these configurations as vortex dipoles are expected to transport mass (and momentum) over long distances.…”

Section: Introductionmentioning

confidence: 99%

Experimental characterization of the 3D dynamics of a laminar shallow vortex dipole

et al. 2009

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. Abstract Experimental results on the dynamics of a vortex dipole evolving in a shallow fluid layer are presented. In particular, the generation of a spanwise vortex at the front of the dipole is observed in agreement with previous experiments at larger Reynolds numbers. The results show that this secondary vortex is of comparable strength to the dipole. The present physical analysis suggests that the origin of this structure involves the stretching induced by the dipole of the boundary-layer vorticity generated by the dipole's advection over the no-slip bottom.

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“…The Po river is the main river of the whole Adriatic Sea to the action of tides (97%), while this influence is reduced offshore ). The tidal cycle is responsible for the formation of two opposite vorticity poles just outside the inlets and, as seen also in laboratory experiments by Wells and Heijst (2003), the geometrical structure of these channels permits the coupling of vortices in dipoles flowing offshore. In the out-flowing phase, then, coherent plume-like structures can be detected at the three inlets.…”

Section: Introductionmentioning

confidence: 96%

Hydrodynamic coastal processes in the North Adriatic investigated with a 3D finite element model

Bellafiore

Umgiesser

2009

Ocean Dynamics

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This paper deals with the interaction and small-scale processes occurring around the inlets that connect the Venice Lagoon with the Northern Adriatic Sea. In a previous paper, barotropic processes have been investigated, whereas here, the focus is on the baroclinic processes. The hydrodynamics of the area are studied by means of a 3D shallow water hydrodynamic finite-element model, suitable to describe areas of complex morphology such as the coasts and the interaction channels. This is the first work that models the 3D interaction between the Venice Lagoon and the Adriatic Sea. Three different sets of simulations have been carried out to identify the physics behind the small-scale processes and the influence of the main forcings on the study area. The first imposes different idealized forcings, such as tides, wind, and river runoff. The vorticity maps of the first two layers show the predominance of wind forcing in the coastal area and tidal forcing in the three inlets of the Lagoon. Bora wind acts homogeneously, increasing the littoral currents, while Sirocco wind mainly impacts near Chioggia inlet, with a coastal current reversal, inducing its detachment offshore. Freshwater patterns are present along the coast, near the river mouths. Rivers do not directly influence Responsible Editor:

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A model of tidal flushing of an estuary by dipole formation

Cited by 59 publications

References 31 publications

Riding the tide: use of a moving tidal-stream habitat by harbour porpoises

Riding the tide: use of a moving tidal-stream habitat by harbour porpoises

Experimental characterization of the 3D dynamics of a laminar shallow vortex dipole

Hydrodynamic coastal processes in the North Adriatic investigated with a 3D finite element model

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