Development of Unsteady Windblown Sand Transport |
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| Authors: | Wang Ping Zheng Xiaojing |
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| Institution: | 1. Key Laboratory of Mechanics on Disaster and Environment in Western China, MEC, Lanzhou University, Lanzhou 730000, China; 2. Department of Mechanics and Engineering Sciences, College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China |
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| Abstract: | The threshold condition and mass flux of aeolian sediment transport are the essential quantities for wind erosion prediction, dust storm modeling and geomorphological evolution, as well as the sand control engineering design. As a consequence, they have long been the key issues of windblown sand physics. Early researches on aeolian sediment transport focus mainly on steady transport process. While recently, synchronous, high frequency measurements show that wind field in atmospheric boundary layer is always unsteady, showing up as intense fluctuation of wind speed, which thus results in the intense spatial-temporal variability of aeolian sand transport. It has been proven that unsteady sand/dust transport is closely related with boundary layer turbulence and affects significantly the determination of threshold condition and the prediction of aeolian transport rate. The researches of experiment, theory analysis and numerical simulation on unsteady sand/dust transport in recent two decades are reviewed. Finally, open questions and future developments are suggested. |
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| Keywords: | Spatiotemporal ariability of transport rate Turbulence structure Wind fluctuation |
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