Post-Doc position: Impact of an offshore wind turbine mast on sediment dynamics
Le Havre, Seine-Maritime
CDD
Temps-plein
Il y a 20 jours
Offer DescriptionDuration : 18 monthsThe proposed subject is part of the “DRACCAR” project: Development of offshore Research platform to Assess physiCal and biologiCal parAmeters for offshore Renewable energy, a project coordinated by France Energies Marines (FEM):The measurement mast off the coast of Fécamp, owned by FEM, enables field data to be acquired. This mast constitutes a genuine research platform at sea where state-of-the-art instrumentation is deployed. This platform is linked to a Research and Development programme. One of the aims of this programme is to improve understanding of the interactions between offshore wind turbines and the environment. Six themes are being considered as part of the DRACCAR project, including the Hydrosedimentary Processes theme, which aims in particular to qualify the way in which the measurement mast can influence the dynamics of the surrounding seabed, and vice versa. The present subject falls within the scope of this theme.The proposed work includes a contribution to the in situ study with our partners, and physical modelling in the laboratory. This type of modelling is essential for improving our understanding of the physical processes controlling sediment dynamics. Sediment transport by bedload will be estimated using an innovative method based on the use of hydrophones. The passive acoustic method will be used at sea and in the laboratory. For the in situ approach, hydrophones will be installed on sea cages deployed near the mast off Fécamp to study the effects of the mast on bedload transport. ADCP (Acoustic Doppler Current Profiler) profilers will provide information on the hydrodynamics in the vicinity of the mast. In situ campaigns will have to be prepared, and the results must be processed and analysed. Considering the laboratory approach, the tests will be carried out in the LOMC wave and/or current channel (see Khoury et al., 2019; Vah et al., 2020, 2022).A particularly sensitive specific hydrophone will be used to estimate bedload transport. This experimental approach will make it possible to control the various hydrodynamic and sediment parameters involved.References :Khoury, A., Jarno, A., & Marin, F. (2019). Experimental study of runup for sandy beaches under waves and tide. Coastal Engineering, 144, 33-46. DOI: 10.1016/j.coastaleng.2018.12.003.Vah, M., Jarno, A., Le Bot, S., Ferret, Y., & Marin, F. (2020). Bedload transport and bedforms migration under sand supply limitation. Environmental Fluid Mechanics, 20(4), 1031-1052. DOI: 10.1007/s10652-020-09738-6.Vah, M., Khoury A., Jarno A., & Marin, F. (2022). A visual method for threshold detection of sediment motion in a flume experiment without human interference. Earth Surface Processes and Landforms, 1-12, DOI: 10.1002/esp.5346.RequirementsSpecific Requirements-Sediment dynamics-Fluid mechanics-Programming in Matlab or PythonAdditional InformationWork Location(s)Number of offers available 1 Company/Institute Le Havre Normandie University Country France City Le Havre GeofieldWhere to apply WebsiteContact WebsiteSTATUS: EXPIRED