Recent bright gully deposits on Mars: Wet or dry flow?

Details Recent bright gully deposits on Mars: Wet or dry flow? Recent bright gully deposits on Mars: Wet or dry flow?

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008geo....36..211p&link_type=abstract

Geology, vol. 36, Issue 3, p.211-214

Physics

26

Scientific paper

Bright gully sediments attributed to liquid water flow havebeen deposited on Mars within the past several years. To testthe liquid water flow hypothesis, we constructed a high-resolution(1 m/pixel) photogrammetric digital elevation model of a craterin the Centauri Montes region, where a bright gully depositformed between 2001 and 2005. We conducted one-dimensional (1-D)and 2-D numerical flow modeling to test whether the depositmorphology is most consistent with liquid water or dry granularflow. Liquid water flow models that incorporate freezing canmatch the runout distance of the flow for certain freezing ratesbut fail to reconstruct the distributary lobe morphology ofthe distal end of the deposit. Dry granular flow models canmatch both the observed runout distance and the distal morphology.Wet debris flows with high sediment concentrations are alsoconsistent with the observed morphology because their rheologiesare often similar to that of dry granular flows. As such, thepresence of liquid water in this flow event cannot be ruledout, but the available evidence is consistent with dry landsliding.

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