Drainage pits in cohesionless materials - Implications for the surface of PHOBOS

Details Drainage pits in cohesionless materials - Implications for the surface of PHOBOS Drainage pits in cohesionless materials - Implications for the surface of PHOBOS

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9412433h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Sept. 10, 1989, p. 12433-12441.

Physics

27

Deimos, Mars Craters, Phobos, Satellite Surfaces, High Resolution, Satellite Imagery, Viking Orbiter Spacecraft, Mars, Satellites, Phobos, Surface, Pits, Drainage, Features, Geometry, Fractures, Origin, Formation, Hypotheses, Simulations, Viking Missions, Laboratory Studies, Experiments, Grooves, Regolith, Thickness, Orbiters, Photographs, Spacecraft Observations, Diagrams

Scientific paper

The origin of the pits and grooves on the surface of Phobos visible on the Viking orbital images of Phobos is investigated using a model of the mechanism of venting and drainage of regolith into open fractures, which is the mechanism that is best supported by image data. In this model, drainage pits and fissures are modeled experimentally by considering two rigid substrate plates placed edge to edge and covered by uniform thicknesses of dry fragmental debris (simulated regolith); fracture extension is simulated by drawing the plates apart, allowing the regolith to drain into the newly created void. The resulting experimental patterns of pits and grooves were found to have pronounced similarities with those observed on Phobos, displaying many characteristics, such as the lack of raised rims, the linearity of grooves and chains of pits, a uniform spacing of pits, and the progression from discrete pits to cuspate grooves, which are the same as those observed on Phobos.

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