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Improving the Parameterisation of Horizontal Density Gradient in One-dimensional Water Column Models for Estuarine Circulation : Volume 4, Issue 4 (19/11/2008)

By Blaise, S.

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Book Id: WPLBN0004020359
Format Type: PDF Article :
File Size: Pages 8
Reproduction Date: 2015

Title: Improving the Parameterisation of Horizontal Density Gradient in One-dimensional Water Column Models for Estuarine Circulation : Volume 4, Issue 4 (19/11/2008)  
Author: Blaise, S.
Volume: Vol. 4, Issue 4
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2008
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Deleersnijder, E., & Blaise, S. (2008). Improving the Parameterisation of Horizontal Density Gradient in One-dimensional Water Column Models for Estuarine Circulation : Volume 4, Issue 4 (19/11/2008). Retrieved from http://www.ebooklibrary.org/


Description
Description: Université catholique de Louvain, Unité de Génie Civil et Environnemental, Louvain-la-Neuve, Belgium. A new parameterisation of horizontal density gradient for a one-dimensional water column estuarine model, inspired by the first-order finite-difference upwind scheme, is presented. This parameterisation prevents stratification from growing indefinitely, a deficiency usually referred to as runaway stratification. It is seen that, using this upwind-like parameterisation, the salinity must remain comprised between upper and lower bounds set a priori and that any initial over- or under-shooting is progressively eliminated. Simulations of idealised and realistic estuarine regimes indicate that the new parameterisation lead to results that are devoid of the runaway stratification phenomenon, as opposed to previously used models.

Summary
Improving the parameterisation of horizontal density gradient in one-dimensional water column models for estuarine circulation

Excerpt
Blaise, S., Deleersnijder, E., White, L., and Remacle, J.-F.: 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, 2329–2345, 2007.; Burchard, H.: Recalculation of surface slopes as forcing for numerical water column models and tidal flow, Appl. Math. Mod., 23, 737–755, 1999.; Burchard, H. and Baumert, H.: The formation of estuarine turbidity maxima due to density effects in the salt wedge. A hydrodynamic process study, J. Phys. Oceanogr., 28, 309–321, 1998.; Deleersnijder, E. and Luyten, P.: On the practical advantages of the quasi-equilibrium version of the Mellor and Yamada level 2.5 turbulence closure applied to marine modelling, App. Math. Mod., 18, 281–287, 1994.; Deleersnijder, E., Campin, J.-M., and Delhez, E. J M.: The concept of age in marine modelling I. Theory and preliminary model results, J. Mar. Sys., 28, 229–267, 2001.; Galperin, B., Kantha, L., Hassid, S., and Rosati, A.: A quasi-equilibrium turbulent energy model for geophysical flows, J. Atmos. Sci., 45, 55–62, 1988.; Hanert, E., Deleersnijder, E., Blaise, S., and Remacle, J.-F.: Capturing the bottom boundary layer in finite element ocean models, Ocean Model., 17, 153–162, 2007.; Gourgue, O., Deleersnijder, E., and White, L.: Toward a generic method for studying water renewal, with application to the epilimnion of Lake Tanganyika, Estuarine, Coastal and Shelf Science, 74, 764–776, 2007.; Hanert, E., Deleersnijder, E., and Legat, V.: An adaptative finite element water column model using the Mellor-Yamada level 2.5 turbulence closure scheme, Ocean Model., 12, 205–223, 2006.; Hetland, R D. and Geyer, W R.: An idealized study of the structure of long, partially mixed estuaries, J. Phys. Oceanogr., 34, 2677–2691, 2004.; Jay, D A. and Musiak, J D.: Particle trapping in estuarine tidal flows, J. Geophys. Res., 99, 445–461, 1994.; Legrand, S., Deleersnijder, E., Hanert, E., Legat, V., and Wolanski, E.: High-resolution, unstructured meshes for hydrodynamic models of the Great Barrier Reef, Australia, Estuarine, Coastal and Shelf Science, 68, 36–46, 2006.; Lewandowski, R.: Analyse Mathématique et Océanographie, Masson, Paris, 281 p., 1997.; Linden, P F. and Simpson, J E.: Gravity-driven flows in a turbulent fluid, J. Fluid Mech., 172, 481–497, 1986.; Linden, P F. and Simpson, J E.: Modulated mixing and frontogenesis in shallow seas and estuaries, Cont. Shelf Res., 8, 1107–1127, 1988.; Lucas, L V., Cloern, J E., Koseff, J R., Monismith, S G., and Thompson, J K.: Does the Sverdrup critical depth model explain bloom dynamics in estuaries?, J. Mar. Res., 56, 375–415, 1998.; Lucas, L V., Koseff, J R., Cloern, J E., Monismith, S G., and Thompson, J K.: Processes governing phytoplankton blooms in estuaries. I: The local production-loss balance, Marine Ecology Progress Series, 187, 1–15, 1999.; Mellor, G L. and Yamada, T.: A hierarchy of turbulence closure models for planetary boundary layers, J. Atmos. Sci., 31, 1791–1806, 1974.; Mellor, G L. and Yamada, T.: Development of a turbulence closure model for geophysical fluid problems, Review of Geophysics and Space Physics, 20, 851–875, 1982.; Monismith, S G. and Fong, D A.: A simple model of mixing in stratified tidal flows, J. Geophys. Res., 101, 28 583–29 595, 1996.; Monismith, S G., Burau, J R., and Stacey, M T.: San Francisco Bay: The Ecosystem, chap. Stratification dynamics and gravitational circulation in Northern San Francisco Bay, pp. 123–153, American Association for the Advancement of Science, San Francisco, 1996.; Nunes Vaz, R A. and Simpson, J H.: Turbulence closure modeling of estuarine stratification, J. Geophys. Res., 99, 16 143–16 160, 1994.; Scott, C F.: A prescriptive bulk model of periodic estuarine stratification driven by density currents and tidal straining, Environmental Modeling and Assessment, 9, 13–22, 2004.; Sharples, J. and Simpson, J H.: Periodic frontogenesis in a region of freshwater influence, Es

 

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