28 Jun 2022
28 Jun 2022

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

Sébastien Petton1, Valérie Garnier2, Matthieu Caillaud3, Laurent Debreu4, and Franck Dumas5 Sébastien Petton et al.
  • 1Ifremer, Univ Brest, CNRS, IRD, LEMAR, 11 Presqu’île du Vivier, F-29840 Argenton, France
  • 2Ifremer, Univ Brest, CNRS, IRD, LOPS, 1625 Route de Sainte-Anne, F-29280 Plouzané, France
  • 3Ifremer, DYNECO, 1625 Route de Sainte-Anne, F-29280 Plouzané, France
  • 4INRIA, Univ Grenoble Alpes, CNRS, LJK, F-38000 Grenoble, France
  • 5SHOM / STM / REC, 13 Rue de Châtellier CS 92803, 29228 Brest CEDEX 2, France

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.

Sébastien Petton et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-337', Anonymous Referee #1, 02 Aug 2022
    • AC1: 'Reply on RC1', Sebastien Petton, 21 Oct 2022
  • RC2: 'Comment on egusphere-2022-337', Anonymous Referee #2, 18 Aug 2022
    • AC2: 'Reply on RC2', Sebastien Petton, 21 Oct 2022

Sébastien Petton et al.

Sébastien Petton et al.


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Short summary
The nesting AGRIF library is implemented in the MARS3D hydrodynamic model. Two applications at regional and coastal scale are introduced. A comparison of the two-nesting to the classic offline one-way approach based on in situ dataset is presented. The two-way nesting is an efficient mean to significantly improve the physical hydrodynamics and bring it biological issues.