HR: 1340h
AN: P23A-1090    [Abstracts]
TI: Mobility and topographic effects for large Valles Marineris landslides on Mars
AU: * Lucas, A
EM: lucas@ipgp.fr
AF: Institut de Physique du Globe de Paris, UMR-CNRS 7154, Université Denis Diderot, 4 place Jussieu, Paris, 75252, France
AU: * Lucas, A
EM: lucas@ipgp.fr
AF: Laboratoire de Planétologie et de Géodynamique, UMR-CNRS 6112, Université de Nantes, 2 rue de la Houssinière, Nantes, 44233, France
AU: Mangeney, A
EM: mangeney@ipgp.fr
AF: Institut de Physique du Globe de Paris, UMR-CNRS 7154, Université Denis Diderot, 4 place Jussieu, Paris, 75252, France
AU: Mangeney, A
EM: mangeney@ipgp.fr
AF: Intitute for Nonlinear Science, University of California, La Jolla, San Diego, CA 92037, United States
AB: Recent experiments on dry granular flows over horizontal plane bare some similarities with large Martian landslides observed in Valles Marineris (VM). However, Martian normalized runout are twice as large as those that observed in dry granular flow experiments. Numerical simulations on theoretical 2D and real 3D topographies reconstructed from remote sensing data show that slope effects significantly reduce the shift between experimental results and Martian observation. However, topography effects are not strong enough to explain the high mobility of Martian landslides. As a result, other physical and/or geological processes should play a key role into the dynamics of Martian landslides. A new mobility is defined that makes it possible to characterize the dynamics of the flow regardless of the geometry of the released mass and of the underlying topography.
DE: 0545 Modeling (4255)
DE: 5415 Erosion and weathering
DE: 5419 Hydrology and fluvial processes
DE: 5464 Remote sensing
DE: 6225 Mars
SC: Planetary Sciences [P]
MN: 2007 Fall Meeting