Analysis of variations in the saltating sand grain transport velocity
- 33 Downloads
A technique is developed for retrieving the vertical profile of the mass saltation flux from measurements of the saltating sand mass concentration and wind velocity in the surface air layer. The technique is based on the solution of direct and inverse problems of the saltation sand dynamics and aimed at determining the sliding coefficient of sand grains. The calculation results for the sliding coefficient of sand grains are compared with data of measurements in wind channels. The conditions under which saltating sand trajectories fall in the height ranges from 5 to 10 mm and from 10 to 20 mm are revealed. The effect of variations in the diameter, lift-off velocity and angle, and friction velocity on the sliding coefficient of sand grains is analyzed. The sliding coefficient for 100-μm diameter sand particles is estimated for the first time.
Keywordssaltation dynamics direct and inverse problems mass saltation flux sliding coefficient retrieval method
Unable to display preview. Download preview PDF.
- 1.R. A. Bagnold, The Physics of Blown Sand and Desert Dunes (Methuen, London, 1941).Google Scholar
- 3.A. N. Zolotokrylin, Climatic Dessrtification (Nauka, Moscow, 2003) [in Russian].Google Scholar
- 4.E. K. Byutner, Dynamics of the Surface Air Layer (Gidrometeoizdat, Leningrad, 1978) [in Russian].Google Scholar
- 5.Y. Shao, Physics and Modeling of Wind Erosion (Springer, New York, 2008).Google Scholar
- 7.O. E. Semenov, Introduction in Experimental Meteorology and Climatology of Desert Storms (KazNIIEK, Almaty, 2011) [in Russian].Google Scholar
- 9.G. I. Gorchakov, V. M. Kopeikin, A. V. Karpov, D. V. Buntov, and A. V. Sokolov, “Specific charge of saltating sand particles on desertified areas,” Dokl. Akad. Nauk 456 (4), 476–480 (2014).Google Scholar
- 14.G. I. Gorchakov, D. V. Buntov, A. V. Karpov, I. A. Zlobin, and A. V. Sokolov, “Saltation of sand particles in the surface air layer on desertied areas,” in Proc. of VII Conf. “Natural and Anthropogenic Aerosols” (SPbGU, St. Petersburg, 2011), p. 293–298 [in Russian].Google Scholar
- 19.A. M. Obukhov, Atmospheric Turbulence and Dynamics (Gidrometeoizdat, Leningrad, 1988) [in Russian].Google Scholar
- 20.A. F. Kurbatskii, Introduction in Simulation of the Turbulent Transfer of Pulse and Scalar (GEO, Novosibirsk, 2007) [in Russian].Google Scholar
- 21.L.-T. Fu, T.-L. Bo, H.-H. Gu, and X.-J. Zheng, “Incident angle of saltating particles in wind-blown sand,” PLOS ONE 8 (7) (2013).Google Scholar