My research is focused on
understanding the evolution of surfaces and near surfaces of the Earth and other planets,
including lakes on Titan, landslides on Mars and icy satellites as well as
aeolian transport on Mars, Venus and Titan.
Other planets allow us to test our understanding of geological
and climate processes under a wide range of conditions.
By combining observations from planetary
exploration missions with image processing and numerical modeling, I try to understand
what controls the evolution of continental surfaces (including planetary counterparts) and more specifically mass wasting, aeolian and hydrology processes.
At a glance
Scar geometry and topography effects on landslides dynamics
The impact of the initial scar geometry on flow and distribution of the deposits is studied here using satellite data and numerical modeling of theoretical landslides, and Martian landslides informed by geomorphological analysis, by varying the initial scar geometry from spoon‐shaped to steep wall geometry. Our results show that the runout distance is a very robust parameter that is only slightly affected by the change in the geometry of the initial scar. On the contrary, the lateral extent of the deposit is shown to be controlled by the scar geometry, providing unique insights into the initial landsliding conditions on Mars and makes it possible to accurately recover the volume initially involved, an essential ingredient for volume balance calculation.
Insights on genetic links between outflows and chasmata: Example of Ganges
Within the Valles Marineris region on Mars, systems of interconnected valleys interpreted as flood channels reveals the presence of braided channels and strong incisions into the bedrock. These channels can be used to probe the relationship between the formation of Chasmata and outflow channels. We shown that outflows predated the opening of Chasmata. In addition, possible sapping valleys were formed at the mouth indicating that a residual aquifer could have been responsible for a late hydrogeological activity after the opening and the widening of Chasmata.
A. Mangeney (IPGP, Paris, France), F. Bouchut (DMA, ENS Paris, now at LAMA,Université Paris-Est, France), O. Roche (LVM, Clermont Ferrand, France),J-P Ampuero (Caltech, Pasadena, CA, USA), C. Narteau (IPGP, Paris, France), G. Crosta (University Milano, Italia), O. Hungr (U British Columbia, Canada), P. Favreau (IPGP, Paris, France)
E. Kite (Caltech), D. Burr (UTK, USA), T. Perron (MIT, USA)
F. Ayoub (Caltech, Pasadena, USA), C. Deledalle (Telecom, Paris, France), S. Leprince (Caltech, Pasadena, USA), J-D. Durou (IRIT, Toulouse, France) N. Sabater (Technicolor, France)