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Offre de Thèse : Morphodynamisme de la Baie de Somme
L'approche est basée sur le couplage de mesures multi-échelles et multi-capteurs pour étudier la topo-bathymétrie et la couverture sédimentaire 3D de la baie (images satellites multi-spectrales, LiDAR aéroporté et drone avec caméras hyperspectrales et thermiques, LiDAR Terrestre, sondages bathymétriques multi-faisceaux, mesures sismiques, analyses en laboratoire sur des échantillons de surface et des carottes courtes incluant caméra hyperspectrale et mesures radiométriques in situ).
Les candidatures sont attendues jusqu'au 1er juin 2022 en envoyant CV et lettre de motivation aux 3 personnes suivantes Julien Deloffre (Univ. Rouen), Sophie Lebot (Univ. Rouen) et Charles Verpoorter (Univ. du Littoral Côte d'Opale).
L'annonce rédigée en anglais est reprise ci-dessous
- Subject area: Sedimentology, Remote Sensing, Fluid mechanics, Data science. Salary: 1450 net/month, with social security medical coverage
- Duration: 3 years
- Application deadline: 01st June 2022
- Laboratories:
Sujet
Coastal areas are strongly impacted by climate change (e.g., sea level rise, changes in storm regimes), which leads to changes in the frequency and intensity of flooding as well as coastline retreat. These consequences are well modelled at global scale, they remain complex to understand at local/regional scales. In this context, the development of coastal models is a major challenge for predicting responses to such disturbances and therefore adopting optimal risk management strategies.
The Bay of the Somme (North of France), a system little impacted by man, is a sandy mouth in a mixed tidal and swell environment of the Eastern English Channel. The objective of this PhD thesis is to determine both the morphological and the sedimentary evolutions of this particular coastal system in response to hydro-meteorological and marine forcings by integrating multi-scale and multi-sensor measurements including:
- Topo-bathymetry: analyses of multi-spectral satellite images, airborne LiDAR and drone with hyperspectral and thermal cameras, LiDAR Terrestrial, bathymetric multibeam soundings and seismic measurements.
- Sedimentary cover: lab analyses on surface samples and short cores (including hyperspectral camera) and in situ radiometric measurements.
- Analyses of the evolution of hydrodynamic conditions by coupling re-analysis models (multi-decadal scale) and short-term field campaigns (monthly scale).
This methodological coupling will make it possible to:
- Assess the sediment accretion/erosion rates and their spatio-temporal variability,
- Characterize the evolution of the sediment coverage into the 3 spatial dimensions, and
- Calculate the sediment budget. In addition, results will also help to calibrate/validate hydro-sedimentary numerical models specifically designed for the Bay of the Somme.
Profile
Training in earth sciences, and in particular in sedimentology, hydrodynamics/fluid mechanics and/or sediment dynamics. Knowledge of coastal environments. Experience in remote sensing analysis and/or in situ measurements is required to apply for this position.
