Using the two-way nesting technique AGRIF with MARS3D V11.2 to improve hydrodynamics and estimate environmental indicators

Type Article
Date 2023-02
Language English
Author(s) Petton SébastienORCID1, Garnier ValerieORCID2, Caillaud Matthieu3, Debreu Laurent4, Dumas Franck5
Affiliation(s) 1 : Ifremer, Univ Brest, CNRS, IRD, LEMAR, 11 Presqu’île du Vivier, F-29840 Argenton, France
2 : Ifremer, Univ Brest, CNRS, IRD, LOPS, 1625 Route de Sainte-Anne, F-29280 Plouzané, France
3 : Ifremer, DYNECO, 1625 Route de Sainte-Anne, F-29280 Plouzané, France
4 : INRIA, Univ Grenoble Alpes, CNRS, LJK, F-38000 Grenoble, France
5 : SHOM / STM / REC, 13 Rue de Châtellier CS 92803, 29228 Brest CEDEX 2, France
Source Geoscientific Model Development (1991-959X) (Copernicus GmbH), 2023-02 , Vol. 16 , N. 4 , P. 1191-1211
DOI 10.5194/gmd-16-1191-2023
WOS© Times Cited 2

Abstract. In the ocean, meso / submesoscale structures and coastal processes are associated with fine scales. The simulation of such features thus requires the hydrodynamic equations to be solved at high-resolution (from a few hundred meters down to a few tens of meters). Therefore, local mesh refinement is a primary issue for regional and coastal modelling. As over structured grids, AGRIF (Adaptive Grid Refinement In Fortran) library is committed to tackle this challenge. It has been implemented in MARS3D, which is a numerical model developed by Ifremer (the French research institute for the exploitation of the sea) for coastal environmental researches and studies. The present paper describes how the dedicated implementation preserves some essential principles (mass conservation, constant preserving…) along with the induced constraints. The use and the performance of this new tool are detailed over two configurations that illustrate the wide range of scales and resolutions typically targeted by coastal applications. The first one is based on multiple high-resolution (500 m) grids that pave the coastal ocean over thousands of kilometres, allowing a continuum between the regional and coastal scales. The second application is more local and has a finer resolution (50 m). It targets a recurrent question for semi-enclosed bays: the renewal time indicator. Throughout these configurations, the paper intends at comparing the two-way nesting method with the traditional one-way approach and highlights how MARS3D-AGRIF tool proves to be an efficient way significantly improve the physical hydrodynamics and bring it biological issues.

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Petton Sébastien, Garnier Valerie, Caillaud Matthieu, Debreu Laurent, Dumas Franck (2023). Using the two-way nesting technique AGRIF with MARS3D V11.2 to improve hydrodynamics and estimate environmental indicators. Geoscientific Model Development, 16(4), 1191-1211. Publisher's official version : , Open Access version :