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A Multi-Process Test Case to Perform Comparative Analysis of Coastal Oceanic Models

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Abstract

Due to the wide variety of choices that need to be made during the development of dynamical kernels of oceanic models, there is a strong need for an effective and objective assessment of the various methods and approaches that predominate in the community. We present here an idealized multi-scale scenario for coastal ocean models combining estuarine, coastal and shelf sea scales at midlatitude. The bathymetry, initial conditions and external forcings are defined analytically so that any model developer or user could reproduce the test case with its own numerical code. Thermally stratified conditions are prescribed and a tidal forcing is imposed as a propagating coastal Kelvin wave. The following physical processes can be assessed from the model results: estuarine process driven by tides and buoyancy gradients, the river plume dynamics, tidal fronts, and the interaction between tides and inertial oscillations. We show results obtained using the GETM (General Estuarine Transport Model) and the CROCO (Coastal and Regional Ocean Community model) models. Those two models are representative of the diversity of numerical methods in use in coastal models: GETM is based on a quasi-lagrangian vertical coordinate, a coupled space-time approach for advective terms, a TVD (Total Variation Diminishing) tracer advection scheme while CROCO is discretized with a quasi-eulerian vertical coordinate, a method of lines is used for advective terms, and tracer advection satisfies the TVB (Total Variation Bounded) property. The multiple scales are properly resolved thanks to nesting strategies, 1-way nesting for GETM and 2-way nesting for CROCO. Such test case can be an interesting experiment to continue research in numerical approaches as well as an efficient tool to allow intercomparison between structured-grid and unstructured-grid approaches. Reference : Klingbeil, K., Debreu, L., Lemarié, F., Burchard, H. : The numerics of hydrostatic structured-grid coastal ocean models: state of the art and future perspectives. Ocean Modell.
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Dates and versions

hal-01685264 , version 1 (16-01-2018)

Identifiers

  • HAL Id : hal-01685264 , version 1

Cite

Florian Lemarié, Hans Burchard, Knut Klingbeil, Laurent Debreu. A Multi-Process Test Case to Perform Comparative Analysis of Coastal Oceanic Models . AGU Fall meeting, Dec 2016, San Francisco, United States. ⟨hal-01685264⟩
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