Fluid dynamical implications of anastomosing slope streaks on Mars

Hideaki Miyamoto, James M. Dohm, Ross A. Beyer, Victor Baker

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

The Mars Global Surveyor mission has imaged slope streaks, some of which have formed in periods as short as 109 days. These features are one of the most currently active surface processes on Mars. Some slope streaks have flow-like morphologic characteristics, which include anastomosing patterns influenced by small topographic barriers. In order to understand what processes gave rise to these specific features, we applied viscoplastic flow numerical modeling techniques to simulated Martian surfaces. We simulate Martian surfaces with observed slope streaks by using Mars Orbiter Laser Altimeter measurements to obtain large-scale slope measurements and a photoclinometry technique on Mars Orbiter Camera images to obtain meter-scale topographic information. Our numerical simulations of slow-moving plastic flows show that a fluid rheology and a short formation period are necessary to explain these features. We estimate that the typical values of bulk viscosity and bulk yield strength are less than 10 Pa s and less than 10 Pa, respectively. The fluid rheology can be explained by a water-related flow with a solid content less than about 20%. An alternative explanation is a dry grain flow with extremely low cohesion and friction angle supported by dispersive pressure or a lubricant, such as electric conditions of particles. The continuous nature of anastomosing slope streaks that originate from point sources is best explained by continuous discharges of material or lubricant. In this case, the estimated flow rate is less than several cubic meters per second, and the flow duration is estimated to be less than a day.

Original languageEnglish (US)
JournalJournal of Geophysical Research: Space Physics
Volume109
Issue number6
DOIs
StatePublished - Jun 25 2004

Fingerprint

mars
Mars
Mars Global Surveyor
slopes
Rheology
Fluids
Lubricants
fluid
fluids
lubricants
Aneroid altimeters
rheology
lubricant
barriers (landforms)
Plastic flow
Yield stress
viscoplasticity
Cameras
Flow rate
photogrammetry

Keywords

  • Mars
  • Slope streak
  • Water

ASJC Scopus subject areas

  • Oceanography
  • Astronomy and Astrophysics
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences (miscellaneous)
  • Geophysics
  • Geochemistry and Petrology

Cite this

Fluid dynamical implications of anastomosing slope streaks on Mars. / Miyamoto, Hideaki; Dohm, James M.; Beyer, Ross A.; Baker, Victor.

In: Journal of Geophysical Research: Space Physics, Vol. 109, No. 6, 25.06.2004.

Research output: Contribution to journalArticle

Miyamoto, Hideaki ; Dohm, James M. ; Beyer, Ross A. ; Baker, Victor. / Fluid dynamical implications of anastomosing slope streaks on Mars. In: Journal of Geophysical Research: Space Physics. 2004 ; Vol. 109, No. 6.
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