PhD offer: Sediment transport in the presence of cohesive and non-cohesive sediments

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PhD offer: Sediment transport in the presence of cohesive and non-cohesive sediments

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Job description

Offer DescriptionThis project concerns sediment transport in coastal zones. It has direct applications to coastal erosion. This is particularly important in the context of climate change, with a predicted rise in sea level and increased vulnerability of the coastline. The proposed study also has applications for sediment management in waterways and ports. The seabed is often made up of fine particles (clay, silt), leading to a cohesive nature of the seabed, and larger particles (sand, gravel, etc.), which are non-cohesive. The study of the response of a sediment bed to hydrodynamic forcing (tidal current, waves, combined waves and current flows) is very important in the coastal environment. Sediment transfers take place between the coast and the open sea; however, the physical processes driving these transfers are poorly understood. Most previous studies have been carried out in the context of sand-type sediments (Durafour et al. 2015, Khoury et al. 2019, Marin 2016, Vah et al. 2020, 2022), and the current state of knowledge on the impact of the presence of fine particles, which are very often observed in situ, on seabed erosion thresholds and on particle transport when these thresholds are exceeded, is very limited. The rheological properties of sediments are crucial for the erosion resistance of a cohesive sediment bed. It has recently been shown that a small proportion of clay in a non-cohesive environment can significantly reduce sediment transport (Bougouin et al., 2022).This subject falls within the scope of theme 1 “Territories, logistics, environment and complex systems” of the science policy of Le Havre Normandie University, and within the Civil Engineering, Composites, Coastal Environment (GCE) theme of the LOMC laboratory, UMR 6294 CNRS. The proposed work is in line with the SELINE (Normandy coastal sediments; 2018-2021) RIN (Normandy Interest Network)) project, and the hydro-sediment component of the TIGER (Tidal Stream Industry Energiser; 2019-2023) Interreg contract.The proposed work will provide a better understanding of the physical processes driving sediment transport in coastal areas, improve estimates of this transport and thus help to anticipate the risks associated with coastal erosion. The approach used will be physical modelling based on flume tests at the LOMC laboratory, UMR 6294 CNRS, Le Havre Normandie University. This experimental approach makes it possible to control the various hydrodynamic and sediment parameters involved. The results obtained will be very valuable for modelers using the numerical approach.

References:Bougouin, A., Benamar, A., Jarno, A., Marin, F., & Pantet, A. (2022). Rheological behaviour of pure clay and coarse-grained clay suspensions using an inclined blade vane-in-cup. Journal of Non-Newtonian Fluid Mechanics, 300, 104714. DOI : 10.1016/j.jnnfm.2021.104714.Durafour, M., Jarno, A., Le Bot, S., Lafite, R., & Marin, F. (2015). Bedload transport for heterogeneous sediments. Environmental Fluid Mechanics, 15(4), 731-751. DOI: 10.1007/s10652-014-9380-1.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.Marin F. (2016). Hydrodynamique Marine, Editeur: Ellipses, ISBN : 9782340013353, 160 pages.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.RequirementsResearch Field Engineering » Maritime engineering Education Level Master Degree or equivalentSkills/QualificationsFluid mechanics, sediment dynamics, Matlab or Python software, experimental approachSpecific RequirementsSerious, motivationLanguages ENGLISH Level GoodResearch Field EngineeringAdditional InformationBenefits

• Funding for the 3 years of the thesis is acquired

• Joining a recognised team in the field

• State-of-the-art instrumentation

Selection processSend:-CV with academic background and internships
– Letter of motivation
– Transcripts and rankings (including Semester 3 of the Master’s degree), if applicable from engineering schools
– Letters of recommendation (including that of the internship supervisor of the 4th Semester of the Master, or if applicable that of the end-of-study internship supervisor in an engineering school)to:Once we have received these documents, you may be selected for an audition.Work Location(s)Number of offers available 1 Company/Institute LOMC laboratory, LeHavre Normandy University Country France City LeHavre Postal Code 76600 Street 53 rue de Prony GeofieldWhere to apply E-mailfrancois.marin@univ-lehavre.frContact CityLe Havre WebsiteStreet53, rue de Prony Postal Code76600 E-Mailfrancois.marin@univ-lehavre.frSTATUS: EXPIRED

Expected salary

Location

Le Havre, Seine-Maritime

Job date

Wed, 17 Apr 2024 23:05:14 GMT

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