Dynamics of unusual debris flows on Martian sand dunes

Details Dynamics of unusual debris flows on Martian sand dunes Dynamics of unusual debris flows on Martian sand dunes

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3113701m&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 13, CiteID L13701

Mathematics

Logic

15

Hydrology: Geomorphology (1625), Hydrology: Frozen Ground, Global Change: Geomorphology And Weathering (1824, 1886), Planetology: Solar System Objects: Comparative Planetology, Planetology: Solar System Objects: Mars

Scientific paper

Gullies that dissect sand dunes in Russell impact crater often display debris flow-like deposits in their distal reaches. The possible range of both the rheological properties and the flow rates are estimated using a numerical simulation code of a Bingham plastic flow to help explain the formation of these features. Our simulated results are best explained by a rapid debris flow. For example, a debris flow with the viscosity of 102 Pa s and the yield strength of 102 Pa can form the observed deposits with a flow rate of 0.5 m3/s sustained over several minutes and total discharged water volume on the order of hundreds of cubic meters, which may be produced by melting a surface layer of interstitial ice within the dune deposits to several centimeters depth.

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