Simon Treillou

PhD candidate

IRD-SHOM

Email : simon.treillouDear bot, you won't get my mail address@and my domain...ird.fr

LITTORAL

3rd year PhD candidate. Temporary title: "Study of 3D surfzone dynamics using a wave-resolving model (CROCO)"

CV / functions

Education

Sep. 2021 – Sep. 2024 PhD – SDU2E, University Paul Sabatier, Toulouse
2016 – 2021 Master of Science and Engineering in Applied Mathematics – INSA, Toulouse

Experience

Feb. 2021 – Jul. 2021 Internship at AMAP/CIRAD (Montpellier). Reformulation and optimization of the bio-physical model PlantBiophysics.jl coupling photosynthesis and energy balance within the leaf. Scientific paper in progress.
Jun. 2020 – Sep. 2020 Internship at LEGOS/IRD (Toulouse). Numerical modeling of internal tide generation by a seamount with CROCO

Research

The general objective of my thesis is to develop a better understanding of non-hydrostatic 3D processes and their impact on nearshore hydrodynamics. The nearshore zone includes the surf zone and a subtidal zone, the inner shelf, extending offshore to a depth of about 20 m. The nearshore zone is particularly complex, as processes of very different temporal and spatial scales coexist and interact. It is therefore essential to improve our knowledge to correctly represent the transport of biogeochemical tracers and sediments. Since most simulations of the nearshore zone are performed using depth-averaged (2D) Boussinesq models, the impact of 3D non-hydrostatic dynamics on eddies in the surf zone and offshore transport currently remains unknown. Yet, Boussinesq models struggle to describe field observations and may miss important processes.

Recently, RANS-type, 3D wave-resolving models with a free surface have been made available to researchers to study the nearshore zone. The model used here is CROCO (Coastal and Regional Ocean Community model), enriched with a compressible, non-hydrostatic solver allowing us to explicitly resolve surface waves and the transfer of motion through surfing to the three-dimensional coastal circulation (Marchesiello et al., 2021). It allows for the simulation and understanding of coastal processes with a reduced number of unknown parameters. The overall goal of the thesis is therefore to analyze the complete 3D dynamics, including eddy structure, instability mechanisms, turbulent cascades, and transport processes. As CROCO can be progressively degraded to a depth-averaged or even wave-averaged model, it is possible to evaluate the realism of simplified equations commonly used in scientific and engineering studies.

Responsibilities

PhD students’ representative on the laboratory council (2023-2024)

Publications

PEER-REVIEWED ARTICLES

Treillou, S., Marchesiello, P., & Baker, C. M. (2024). Correction of coherent interference in wave-resolving nearshore models and validation with experimental data. Ocean Modelling, 189, 102369. https://doi.org/10.1016/j.ocemod.2024.102369
Marchesiello, P., & Treillou, S. (2023). Correction of GLS turbulence closure for wave-resolving models with stratification. Ocean Modelling, 184, 102212. https://doi.org/10.1016/j.ocemod.2023.102212

CONFERENCES

Treillou, S. and Marchesiello, P.: Impact of 3D non-hydrostatic dynamics on tracer transport in the nearshore region. EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-7843, https://doi.org/10.5194/egusphere-egu23-7843, 2023.
Vezy, R., Perez, R., Treillou, S., Arsouze, T., Dauzat, J.: PlantBiophysics.jl: a set of Julia packages for fast and easy calibration, prototyping and simulation of plant models. FSPM 2023, DOI:10.13140/RG.2.2.17692.16004
Treillou S. and P. Marchesiello, 2022: Impact of 3D nonhydrostatic dynamics on tracer transport in the nearshore region. Revue Paralia. Journées Nationales Génie Côtier – Génie Civil 2022.

TALKS

Treillou S. & Marchesiello P.: “How do 3D non-hydrostatic dynamics affect transport in the nearshore region ?” UCLA, Los Angeles, USA. June 2023
Treillou S. & Marchesiello P.: “How do 3D non-hydrostatic dynamics affect transport in the nearshore region ?” Scripps Institution of Oceanography, San Diego, USA. July 2023

Teaching

2021/2022 : TD+TP modeling initiation (Matlab) for 2nd years INSA Toulouse (UF: “Mathématiques et Bases de transfert”) ~35h

Simon Treillou

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