The MORHOC’H 2 research project is a follow-up to the ANR ASTRID MORHOC’H project, which focused on studying processes that have a significant impact on wave propagation in the presence of a vertically sheared current. Indeed, it is not uncommon to encounter such currents in coastal areas, since the combined effects of wind and bathymetry can profoundly modify their vertical profile.
However, the modelling, both physical and numerical, of such areas is a strategic challenge, both in the civilian field (coastal security, renewable marine energy, etc.) and in the military field (landing, rescue, naval applications).
Two outcomes, resulting from the project, are the focus of our attention here. Thus, the MORHOC’H project lead us developing a particularly robust experimental device aimed at experimentally controlling the vertical structure of a hydrodynamic channel current. In addition, a new model has been developed, named CMS, to extend the scope of wave propagation models with resolved phase to take into consideration configurations involving high current vorticity.
The MORHOC’H 2 project therefore aims to increase the degree of maturity of these two results, bringing them closer to use in real conditions. First, the current profile control device will be extended to larger configurations and will become applicable in three-dimensional basins. Many industrial actors, operators of hydrodynamic test tanks, will then have access to it. 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, to make it usable under realistic conditions. Thus, the improvements resulting from the initial project will become accessible to realistic environments. The two approaches in coastal modelling, physical and numerical, will thus become more efficient and will be able to describe more realistic situations.
Description du poste
This position focuses on the realistic environment, the Alderney Race, where the stronger tidal currents of western Europe (up to 5 m/s) are located. The Alderney Race current is sheared by marine turbulence (Mercier et al., 2020 ; Bennis et al., 2021a) and ocean wave effects (Bennis et al.,
2020, 2021b). The successful applicant will be responsible for evaluating the CROCO model (hydrostatic and non-hydrostatic versions) enriched with CMS using the one-year of in-situ data (ADCP, wave buoy, tidal gauge) and numerical simulations obtained with the wave-averaged coupled
model (CROCO-WAVEWATCH-III). Due to the large amount of in-situ data (Furgerot et al., 2020), not all of the data has been post-processed yet. Therefore, the post-doctoral researcher will need to post-process the required data.
- A.-C. Bennis, L. Furgerot, P. Bailly du Bois, F. Dumas, T. Odaka, C. Lathuilère, J.-F. Filipot. Numerical modelling of three-dimensional interactions in a complex environment: application to Alderney Race. Applied Ocean Research, 2020.
- A.-C. Bennis, F. Adong, M. Boutet, F. Dumas. LANS-alpha turbulence modelling for coastal sea: an application to Alderney Race. Journal of Computational Physics, 2021a.
- A.-C. Bennis, L. Furgerot, P. Bailly du Bois, E. Poizot, Y. Méar, F. Dumas. A winter storm in Alderney Race: impacts of 3D wave-current interactions on the hydrodynamic and tidal stream energy. Applied Ocean Research (submitted), 2021b.
- L. Furgerot, A. Sentchev, P. Bailly du Bois, G. Lopez, M. Morillon, E. Poizot, Y. Méar, A.-C. Bennis. One year measurements in Alderney Race: what did we learn ? Phil. Trans. R. Soc. A., 2020.
- P. Mercier, M. Grondeau, S. Guillou, J. Thiébot, E. Poizot. Numerical study of the turbulent eddies generated by the seabed roughness. Case study at a tidal power site, Applied Ocean Research, 2020.
Collaborations: MIO, Shom, LEGOS, Océanide, LUSAC-Intechmer
Modalités de candidature
How to apply:
Please send a CV, a letter of motivation (up to one page long), and the names of two potential referees, to email@example.com and firstname.lastname@example.org
Application deadline: 30/10/2022