ASTRID-Maturation - Accompagnement spécifique des travaux de recherches et d'innovation Défense : Maturation et Valorisation

Modeling the interaction of swell and inhomogeneous currents in the coastal zone – MORHOC'H 2

Submission summary

The ANR ASTRID MORHOC'H project focused on the study of the interactions between swell and current vorticity. Indeed, it is not rare to encounter such currents in coastal areas, since the combined effects of wind and bathymetry can profoundly modify their vertical profile. The physical and numerical modeling of such areas is a strategic issue, both in the civil domain (coastal security, marine renewable energy, ...) and in the military domain (landing, rescue, naval applications). The project concluded on the importance to take this new parameter into account, as it could play a major role in swell propagation in such situations.

Within the framework of this project, several advances had been obtained in terms of modeling. In particular, two results are of particular interest here. In terms of physical modeling, it was necessary to develop a very robust technique to experimentally control the vertical profile of the current, i.e. the horizontal components of vorticity. As far as analytical and numerical modeling is concerned, a new model had been developed, named CMS, to extend the field of application of phase-resolved wave propagation models in order to take into account configurations involving strong current vorticity.

The MORHOC'H 2 project therefore aims to increase the degree of maturity of these two results, in order to bring them closer to use in real conditions. First of all, the current profile control device will be extended to larger configurations, and will become applicable in three-dimensional basins. This will allow the device to be adapted to a commercial hydrodynamic test basin, the BGO FIRST, at La Seyne-sur-Mer. Thus, it will become applicable to a wide range of industrial, civil and military tests.

In addition, the CMS propagation model will be coupled with the community coastal hydrodynamic circulation code CROCO, developed by SHOM, IRD, CNRS, IFREMER, and INRIA, in order to make it usable under realistic conditions. Indeed, the existing code requires an important evolution, to be coupled with a tool modeling ocean circulation under realistic environmental conditions. A large increase in model maturity will therefore allow to obtain a demonstrator working in operational conditions.

Through this project, the two approaches in coastal modeling, physical and numerical, which are totally complementary, will both progress in degrees of maturity, and will thus become more compatible with realistic situations. The different partners of the project will therefore move towards an operational use of the two models. In addition, this project brings together a consortium involving the company Océanide, the MIO and M2C laboratories, but also SHOM, for the optional work. The project will strengthen the collaboration between these different partners, while illustrating their complementarity.

Project coordinator

Monsieur Julien Touboul (Institut Méditerranéen d'océanologie)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

Oceanide Oceanide
MIO Institut Méditerranéen d'océanologie
M2C Yolande HERVE

Help of the ANR 499,967 euros
Beginning and duration of the scientific project: January 2021 - 24 Months

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