Formation of Mangala Valles outflow channel, Mars: Morphological development and water discharge and duration estimates

Details Formation of Mangala Valles outflow channel, Mars: Morphological development and water discharge and duration estimates Formation of Mangala Valles outflow channel, Mars: Morphological development and water discharge and duration estimates

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jgre..11208003l&link_type=abstract

Journal of Geophysical Research, Volume 112, Issue E8, CiteID E08003

Physics

11

Planetary Sciences: Solid Surface Planets: Hydrology And Fluvial Processes, Hydrology: Geomorphology: Fluvial (1625), Hydrology: Floods, Planetary Sciences: Solar System Objects: Mars

Scientific paper

The morphology of features on the floor of the Mangala Valles suggests that the channel system was not bank-full for most of the duration of its formation by water being released from its source, the Mangala Fossa graben. For an estimated typical 50 m water depth, local slopes of sin α = ~0.002 imply a discharge of ~1 × 107 m3 s-1, a water flow speed of ~9 m s-1, and a subcritical Froude number of ~0.7-0.8. For a range of published estimates of the volume of material eroded from the channel system this implies a duration of ~17 days if the sediment carrying capacity of the ~15,000 km3 of water involved had been 40% by volume. If the sediment load had been 20% by volume, the duration would have been ~46 days and the water volume required would have been ~40,000 km3. Implied bed erosion rates lie in the range ~1 to ~12 m/day. If the system had been bank-full during the early stages of channel development the discharge could have been up to ~108 m3 s-1, with flow speeds of ~15 m s-1 and a subcritical Froude number of ~0.4-0.5.

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