Implications of the landslide scarp geometry on the flow spreading: Application on Terrestrial and Martian landslides

Details Implications of the landslide scarp geometry on the flow spreading: Application on Terrestrial and Martian landslides Implications of the landslide scarp geometry on the flow spreading: Application on Terrestrial and Martian landslides

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.h41k..08l&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #H41K-08

Mathematics

Logic

1625 Geomorphology And Weathering (0790, 1824, 1825, 1826, 1886), 1810 Debris Flow And Landslides, 1849 Numerical Approximations And Analysis, 5415 Erosion And Weathering, 5419 Hydrology And Fluvial Processes

Scientific paper

Landslides take part in weathering and transport processes on Earth as well as on Mars. Prediction of their dynamic remains awkward in spite of many experimental and numerical studies. Numerous numerical works have been carry out on real landslides cases using DTM (Digital Topographic Model) so as to improve our understanding of the behavior by comparing results with field observations. Generally, previously studies are based on runout analysis dealing with mean dissipation calibration such as friction coefficient. Nevertheless, the shape of the initial scarp is generally unknown for real cases. It is perilous in this context to get good predictions of spreading in a given geological setting. We thus tried here to clear up the potential error on mean dissipation because of the uncertainty related to the unkown geometry of the initial scarp. In addition, from the field observations of final stage (e.g. landslide's deposits) we tried to get feeback on initial conditions such as geometry and volume of mass involved. This study is focused on the effect of the scarp geometry on the spreading flow using a numerical model able to take into account the curvature matrix of the bottom topography. Using these capabilities, a benchmarking analysis involving theorical scarp geometries (e.g. 2D and 3D) have been performed. We then combined a geomorphological analysis on real cases. Our results show that the runout distance is not affected by the initial shape of the scarp, whatever the friction coefficient. Otherwise, we observed on 3D tests that the shape of the final deposits is a function of the scarp geometry. As consequences, from final deposits, we are able to get information on both, initial geometries and initial volume involved in the mass spreading. We validated these results with terrestrial examples for which the scarp geometry and friction coefficient are well known. then, as from these results, we tried to apply a feedback analysis on Martian landslides. We get good agreement between geomorphological analysis and modeling, allowing us to explore deeper in initial conditions of landslides on Mars. As conlusions, we developped a feedback analysis process able to give information on volume and shape of the initial mass involved in landslides.

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