Giant comet marks

Details Giant comet marks Giant comet marks

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gml.....4..113f&link_type=abstract

Geo-Marine Letters, Volume 4, Issue 2, pp.113-115

Mathematics

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1

Scientific paper

Large longitudinal bedforms (comet marks) occur on the current-swept shelf off southeast Africa. They emanate from tight clusters of low rock outcrops and are as long as 135 m and as wide as 30 m. The low length/width ratio (1:4.5) is explained by lateral coalescence of several narrow tails associated with individual obstacles. They seem to form by removal of sediment from the wake region of the obstacles. Hydrodynamic considerations indicate a high probability for sonic suspension transport, yet no sand shadows occur in the velocity-defect region of the inner wake. It is concluded that shear velocities must exceed the minimal velocity required to sustain sediment transport.

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