ROMS-AGRIF two-way nesting algorithms: latest developments

Laurent Debreu (INRIA and Laboratoire Jean Kuntzmann, France)

Local mesh refinement (nesting) capabilities have now been added to a number of numerical ocean models. In its crudest form, a high resolution grid is embedded in and interacts with a coarser resolution grid which usually covers the area of interest. The aim of this presentation is to review existing two-way grid embedding algorithms. First, the basic algorithms and their applications to ocean modelling are described. Then, several important issues will be addressed including: barotropic coupling, conservation properties, design of interpolation/restriction operators, and noise control techniques. Finally, results of some numerical experiments with the latest version of the ROMS-AGRIF model are presented.