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www.ocean-sci-discuss.net/5/187/2008/
doi:10.5194/osd-5-187-2008
© Author(s) 2008. This work is distributed
under the Creative Commons Attribution 3.0 License.
A new parameterisation of salinity advection to prevent stratification from running away in a simple estuarine model
1Université catholique de Louvain, Unité de Génie Civil et Environnemental, Louvain-la-Neuve, Belgium
2Université catholique de Louvain, Centre for Systems Engineering and Applied Mechanics, Louvain-la-Neuve, Belgium
Abstract. A new parameterisation of horizontal salinity advection 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 numerical artefact 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 artefact, as opposed to previously used models.
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Citation: Blaise, S. and Deleersnijder, E.: A new parameterisation of salinity advection to prevent stratification from running away in a simple estuarine model, Ocean Sci. Discuss., 5, 187-211, doi:10.5194/osd-5-187-2008, 2008. Bibtex EndNote Reference Manager XML
