Rennes Geosciences research support staff contribute to platforms certified by the University of Rennes 1
Contact : Virginie Vergnaud-Ayraud
The Geohelis platform is a university-certified platform for improving the readability of the institution’s technical resources. It brings together a centre of analytical resources devoted to the analysis of major chemical and trace elements (inorganic anions/cations, dissolved carbon) of environmental samples (mainly water but also certain minerals, biological samples, etc.) and a second devoted to the elementary and/or isotopic analysis (radiogenic isotopes) of rocks and/or minerals to study the origin, the history and age of terrestrial rocks and of the associated minerals.
Contact : Marc Poujol
We are developping processing methods for massive 3D data sets (classification, segmentation, change detection, etc.) from differents sensors e.g. airborne and terrestrial lidars or SFM systems in relation with challenges in the geosciences: natural risks evaluation (lanslides, floods), environmental monitoring (soil erosion, geomorphological analysis). We aim at making these algorithms available to the community and at teaching their usage to the users.
We have an airborne topo-bathymetric lidar sensor unique in France allowing a simultaneous 3D measurement of topography, vegetation and shallow submerged surfaces.
Contact : paul [dot] leroyuniv-rennes1 [dot] fr (Paul Leroy)
Context: The ImaGéo platform "Bio-Géo-Physical systems experimental imagery", created in early 2022 and led by Joris Heyman (CR CNRS, Géosciences Rennes) and Francesco Gomez (IE CNRS, UAR OSUR), aims to federate, promote and develop OSUR’s experimental imaging techniques to characterize complex environmental systems, including :
• deforming solid environments such as tectonic plates, granular flows, avalanches...
• surface flowing fluids such as rivers, erosion and alluvial and wind transport
• fluids flowing below the surface into porous and fractured environments, and their coupling to physical (erosion, heat) and bio-geochemical (bacterial activity and reactivity) processes.
Expertise: Multi-dimensional imaging of the dynamics of deformation, flow and transport, and fluid mixing is essential to quantify, understand and model the functioning of natural surface and sub-surface processes. Specific imaging techniques are needed to achieve both spatial and temporal resolutions specific to microscopic processes operating at small scales, while capturing the heterogeneity that emerges at larger scales. The experimental reproduction of models analogous to the conditions of natural environments (in particular, the state of pressures, temperatures, flows) is at the heart of ImaGéo’s expertise.
Structure: ImaGéo is organized in 5 specialized technical stages, 4 of which are from the Rennes Geosciences laboratories:
- Milli-porous tray (resp Y. Méheust, GR, MCF)
- Micro-Group tray (resp T. Le Borgne, GR, CNAP)
- Tectonic and Geomophological modelling (resp B. Guillaume, GR, MCF)
- Granular tray (resp A. Valance, IPR, DR CNRS)
- Geophysical tray (resp Y. Le Gonidec, GR, CR CNRS)
How it works: The platform offers many imaging services, at academic rates. For more information, visit the platform’s dedicated website, or contact its manager
Contact : Joris Heyman