Disciplines: Earth sciences, geophysics, modelling
- Cerema, ENDSUM (Evaluation Non-Destructive des Structures et des Matériaux – Non-Destructive Evaluation of Structures and Materials), Laboratoire Régional de Rouen (Rouen Regional Laboratory), Unit of Applied Electromagnetism
- INSA Rouen (Institut National des Sciences Appliquées – National Institute of Applied Science), LMI (Laboratoire de Mathématiques de l'INSA – INSA Mathematics Laboratory), EA 3226, FR CNRS 3335
Supervision: Raphaël Antoine (Cerema), Cyrille Fauchard (Cerema), Carole Le Guyader (INSA Rouen)
Under the supervision of the Ministry for the Ecological and Inclusive Transition and the Ministry for Regional Cohesion, Cerema is a centre for scientific and technical resources and expertise, providing support for the design, implementation and evaluation of public policies enacted by government departments and local authorities. The ENDSUM research team performs research in the fields of subsurface geophysics, infrastructure and materials through the use of electromagnetic methods.
The LMI (EA 3226 - FR CNRS 3335) is attached to the Mathematical and Software Engineering Department at INSA Rouen, which awards degrees to around 50 engineers each year. The LMI is also part of the Fédération de Recherche Normandie-Mathématiques (Normandy Mathematics Research Federation; FR CNRS 3335). Its research areas include modelling, digital simulation and optimisation.
The surface temperatures (or brightness) of an area of ground depend firstly on its physical properties (porosity, thermal conductivity, heat capacity), optical properties (albedo, emissivity), topography and meteorology. Restricted for a long time to military and space applications, infrared thermography (IRT), which makes it possible to observe these surface temperatures, is becoming more accessible. Indeed, the progress made in the miniaturisation of thermal sensors now allows the measurement of surface temperatures from a drone or using a smartphone. However, the quantitative use of this method in earth sciences remains limited due to difficulties in interpreting the thermal signal. Over the past few years, there have been several successful studies seeking to understand the impact of the various parameters listed above on the temperatures observed using infrared thermography (IRT) (Antoine, 2009; Lopez, 2012; Gaudin, 2012). While the influence of parameters such as thermal conductivity, emissivity and albedo is fairly well established today, that of topography on the thermal field remains to be quantified.
In the context of the TeleDETaC regional project, the objective of this postdoctoral position is to model in 2D-3D the influence of topography on the thermal field in areas with complex topography (for example, areas with peaks and troughs) using digital codes pairing a ground model with an atmospheric model. The postdoctoral researcher will be required to 1) assess the current state of the art of national/international work on this theme and 2) produce thermal surface models using free digital software such as Code_Saturne, FreeFem++ or Jules. It should be possible to apply these models to surface temperature datasets obtained for the first time in 3D on the Normandy cliffs using a thermal camera on board a drone. 3) Finally, it should be possible to compare these models to geological and geophysical data (electrical imaging, for example) obtained in situ.
Skills required: We are seeking a candidate with experience in the 3D modelling of direct and inverse problems in geophysical methods, and with an interest in Earth Science. The candidate must have an excellent command of both spoken and written English. Name and contact information of 2-3 references.
Key words: 2D-3D modelling, infrared thermography, topography, ground model, atmospheric model, digital surface model, Normandy coast
Duration: 18 months
Deadline for application: 2 February 2018
Start date: 1 April 2018
Salary: Dependent on experience and the scale for contract personnel at the Ministry for the Ecological and Inclusive Transition.
How to apply:
1. Antoine R., Baratoux D., Rabinowicz M., Fontaine F.J., Bachelery P., Staudacher T., Saracco G., Finizola A. (2009). Thermal infrared images analysis of a quiescent cone on Piton de La Fournaise volcano: Evidence for convective air flow within an unconsolidated soil. Journal of Volcanology and Geothermal Research, volume 183, issues 3-4, 2009, pages 228-244.
2. Gaudin D. (2012). Imagerie infrarouge thermique haute resolution : potentiels et limitations pour la geologie. Thesis, Universite de Bretagne Occidentale, 200 pp.
3. Lopez T., Antoine R., Baratoux D., Rabinowicz M., Kurita K., & d'Uston L. (2012). Thermal anomalies on pit craters and sinuous rilles of Arsia Mons: Possible signatures of atmospheric gas circulation in the volcano. Journal of Geophysical Research: Planets, 117 (E9).Lire la suite