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G. I. Gorchakov A. V. Karpov V. M. Kopeikin A. V. Sokolov D. V. Buntov 《Doklady Earth Sciences》2016,467(1):314-319
Quasi-horizontal trajectories of salting sand grains were found using high-speed video-recording in the desertified territory of the Astrakhan region. The sizes and displacement velocities of the saltating sand grains were determined. A piecewise logarithmic approximation of the wind profile in a quasi-stationary wind–sand flow is suggested, which is consistent with the data of observations and modeling. It was established that, in the regime of stationary saltation, the wind profile in the lower saltation layer of the wind–sand flow depends only slightly on the wind profile variations in the upper saltation layer. The vertical profiles of the horizontal wind component gradient in a quasi-stationary wind–sand flow were calculated and plotted. It was shown using high-speed video recording of the trajectory of a sand grain with an approximate diameter of 95 μm that the weightlessness condition in the desertified territory of the Astrakhan region in a stationary wind–sand flow is satisfied at a height of approximately 0.15 mm. The electric parameters of a wind–sand flow, which can provide for compensation of the force of gravity by the electric force, were estimated. In particular, if the specific charge of a sand grain is 100 μC/kg, the force of gravity applied to the sand grain can be compensated by the electric force if the vertical component of the electric field in a wind–sand flow reaches approximately 100 kV/m. It was shown that the quasi-horizontal transport of sand grains in the lower millimeter saltation layer observed in the desertified territory can be explained by the joint action of the aerodynamic drag, the force of gravity, the Saffman force, the lift force, and the electric force. 相似文献
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Gorchakov G. I. Kopeikin V. M. Karpov A. V. Gushchin R. A. Datsenko O. I. Buntov D. V. 《Izvestiya Atmospheric and Oceanic Physics》2022,58(5):466-475
Izvestiya, Atmospheric and Oceanic Physics - Measurements of electric currents of saltation in the wind-sand flux and currents caused by the wind transport of dust aerosol particles have been... 相似文献
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Gorchakov G. I. Kopeikin V. M. Karpov A. V. Gushchin R. A. Datsenko O. I. Buntov D. V. 《Doklady Earth Sciences》2022,505(1):483-488
Doklady Earth Sciences - Using the measurement data in a wind–sand flux on the desertified areas of Astrakhan oblast and Kalmykia, it has been established that the time variability of... 相似文献
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Gorchakov G. I. Karpov A. V. Gushchin R. A. Datsenko O. I. Buntov D. V. 《Doklady Earth Sciences》2021,496(2):119-124
Doklady Earth Sciences - Vertical profiles of the total saltating particle concentration have been constructed for a range of wind speed changes in the surface layer of the atmosphere from 5.5 to... 相似文献
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Gorchakov G. I. Karpov A. V. Gushchin R. A. Datsenko O. I. Buntov D. V. 《Izvestiya Atmospheric and Oceanic Physics》2021,57(5):486-494
Izvestiya, Atmospheric and Oceanic Physics - Measurements in a desertified area in Astrakhan oblast at heights from 3 to 15 cm under almost nonintermittent saltation on August 23 and September 9,... 相似文献
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Gorchakov G. I. Buntov D. V. Karpov A. V. Kopeikin V. M. Mirsaitov S. F. Gushchin R. A. Datsenko O. I. 《Doklady Earth Sciences》2019,488(1):1103-1106
Doklady Earth Sciences - The saltating particle aleurite mode has been discovered in the wind–sand flux over a desertified area. The approximation of the measured saltating particle... 相似文献
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