Meven PHILIPPE

IMG 9341Email: meven.philippe@univ-nantes.fr

Research interests

Keywords: Mars, Earth, geomorphology, periglacial processes, water/water ice, GIS, remote sensing, analogue modelling

- Our recent study gave evidence for the presence of ice-wedge thermal-contraction polygons in Utopia Planitia (Mars). We are now trying to understand what the characteristics of those polygons can tell about the properties of the substrate, using geomorphological mapping. We are showing that strong constraints can be obtained on the origin of polygon-bearing units, with parameters calculated from the density/types of polygons. The method is currently being applied in other polygon-bearing places in the mid-latitudes of Mars.

- Evaluate experimentally the differences in terms of sediment transport between water and brine flows under martian conditions. We highlight that both water and brine can transport sediment by boiling, although it is expected that they would produce different morphologies under the martian low gravity. Conditions compatible with such processes can be reached under certain conditions in the current martian climate.

- Understand for the first time the formation of molards - i.e. the degradation of an ice-cemented block of sediment into a debris cone - by creating analogical models and following their degradation with a time-lapse photogrammetry system. Ultimately, this is intended to differentiate molards from other perglacial conical morphologies, in order to accurately point out areas where permafrost is actively thawing.