Open WL Archief (OWA)

Over het archief

Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.

Dit archief wordt uitgebouwd en beheerd volgens de principes van de Open Access Movement, en het daaruit ontstane Open Archives Initiative.

Basisinformatie over ‘Open Access to scholarly information'.

[ meld een fout in dit record ]

mandje (1): toevoegen | toon

---

one publication added to basket [118469]

Influence of the turbulence closure scheme on the finite-element simulation of the upwelling in the wake of a shallow-water island Blaise, S.; Deleersnijder, E.; White, L.; Remacle, J.-F. (2007). Influence of the turbulence closure scheme on the finite-element simulation of the upwelling in the wake of a shallow-water island. Cont. Shelf Res. 27(18): 2329-2345. dx.doi.org/10.1016/j.csr.2007.06.003 In: Continental Shelf Research. Pergamon Press: Oxford; New York. ISSN 0278-4343; e-ISSN 1873-6955, meer

---

Beschikbaar in	Auteurs
VLIZ: Open Marine Archive 130383 [ download pdf ]

---

Trefwoorden

Analysis > Mathematical analysis > Numerical analysis > Finite element method Motion > Water motion > Circulation > Water circulation > Shelf dynamics Motion > Water motion > Lee eddies Motion > Water motion > Vertical water movement > Upwelling > Coastal upwelling Motion > Water motion > Water currents > Tidal currents Turbulence ISEW, Great Barrier Reef, Rattray I. [Marine Regions] Marien/Kust

Author keywords

finite element method; turbulence closure scheme; upwelling; Lee eddies; shelf dynamics; tidal currents; unstructured mesh; Australia; great barrier reef; Rattray island

---

Auteurs		Top
Blaise, S., meer Deleersnijder, E., meer White, L., meer Remacle, J.-F., meer

---

Abstract

A three-dimensional finite-element model is used to investigate the tidal flow around Rattray Island, Great Barrier Reef, Australia. Field measurements and visual observations show both stable eddies developing at rising and falling tide in the wake of the island. The water turbidity suggests intense upwelling able to carry bed sediments upwards. Based on previous numerical studies, it remains unclear at this point whether the most intense upwelling occurs near the centre of the eddies or off the island's tips, closer to the island. All these studies resorted to a very simple turbulence closure, with a zero-equation model whereby the coefficient of vertical viscosity is computed via an algebraic expression. In this work, we aim at studying the influence of the turbulence closure on model results, with emphasis on the prediction of vertical motions. The Mellor and Yamada level 2.5 closure scheme is used and an increase in the intensity of vertical transport is observed. This increase is partly explained by the fact that the Mellor and Yamada model takes into account the hysteresis effect in the time variation of turbulence variables. The influence of the advection of turbulence variables is estimated to be negligible. By a better representation of transient coastal phenomena, the Mellor and Yamada level 2.5 turbulence closure improves the model to a significant degree.

---

Alle informatie in het Integrated Marine Information System (IMIS) valt onder het VLIZ Privacy beleid

Top | Auteurs

IMIS is ontwikkeld en wordt gehost door het VLIZ.