Improving the parameterisation of horizontal density gradient in one-dimensional water column models for estuarine circulation
Blaise, S.; Deleersnijder, E. (2008). Improving the parameterisation of horizontal density gradient in one-dimensional water column models for estuarine circulation. Ocean Sci. 4(4): 239-246
In: Ocean Science. Copernicus: Göttingen. ISSN 1812-0784; e-ISSN 1812-0792, meer
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 "run-away 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.
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