Mathematics – Logic
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmng43a..01k&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #NG43A-01
Mathematics
Logic
0305 Aerosols And Particles (0345, 4801, 4906), 1622 Earth System Modeling (1225), 1631 Land/Atmosphere Interactions (1218, 1843, 3322), 3307 Boundary Layer Processes, 3311 Clouds And Aerosols
Scientific paper
Wind-blown sand, or 'saltation,' is an important geological process, as well as the primary source of atmospheric dust aerosols. Despite its importance in geological and atmospheric processes, saltation is not well understood yet. We present here the first physically based model of saltation that is rigorously tested with data from field measurements. The model explicitly simulates the trajectories of sand grains moved by wind, calculates the wind profile resulting from the transfer of wind momentum to saltating grains, and accounts for the impact of saltating grains with the soil bed, including the ejection of surface grains. The results of the model, verified by field measurements of saltation mass flux profiles, reveal some surprising deficiencies in the classical understanding of saltation. Model results strongly suggest that the common assumption that particle speed scales linearly with the wind shear velocity (Bagnold, 1941) is incorrect. Moreover, the common hypothesis that the fluid shear stress at the surface remains at the threshold value for particle entrainment results in large discrepancies between model results and experiments. This classical hypothesis, proposed by Owen (1964), is thus probably incorrect. Our model is general and can be adapted to study saltation under a variety of physical conditions, including on sloped terrain such as sand dunes, and on other planetary bodies such as Mars, Venus, and Titan.
Kok Jasper F.
Renno Nilton O.
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