Other
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusm.p32a..04b&link_type=abstract
American Geophysical Union, Spring Meeting 2005, abstract #P32A-04
Other
5430 Interiors (8147), 5455 Origin And Evolution, 5480 Volcanism (8450), 6225 Mars <!: : : : : : : : : : >, 1625 Geomorphology And Weathering (1824, 1886), 1729 Planetology, 5415 Erosion And Weathering, 5460 Physical Properties Of Materials
Scientific paper
The physics of particle movement is distinctly different for aeolian ripples and dunes. Ripples are the result of both saltation and reptation of individual sand grains, and their interaction with the curtain of blowing sand. Dunes, on the other hand, are influenced by the drag on the wind imposed by the presence of saltating sand along with the modified wind flow over or around the sand pile. Intermediate between ripples and dunes are mega-ripples comprised of a bimodal mixture of sand with a surface layer of either granules or pebbles, where the large particles are rolled across the surface through impact creep. We have obtained detailed topographic profiles across both ripples and dunes in an effort to quantify the shape of the landforms produced by these distinct sediment transport conditions. Our profiles cover more than four orders of magnitude of length scale (taken here to be the bedform wavelength ), collected from several aeolian sites throughout the southwestern United States. There is a regular progression in the bedform profile from the asymmetric sand ripples through both symmetric and asymmetric granule and pebble ripples to more symmetric profiles across transverse dunes. There is also a progressive increase in the width of the surface area exposed between the bedforms themselves, from virtually no inter-ripple regions for sand ripples to inter-ripple flats comparable to the bedform length for granule and pebble ripples to inter-dune flats that are much larger the bedform itself in transverse dunes. When scaled to wavelength, these bedform patterns represent a suite against which remotely derived bedform shapes can be compared. We are optimistic that such length-scaled bedform profiles will prove useful as a method for attempting to resolve the current ambiguity that exits regarding whether the ubiquitous transverse aeolian ridges visible in high resolution Mars Orbiter Camera images are the result of ripple or dune formation mechanisms.
Breuer Doris
Schumacher Stefan
Spohn Tilman
Williams Steven H.
Zimbelman James R.
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