Abstract
The analysis of the real-time simultaneous measurement data of the sand flux and wind speed fluctuations in the aeolian sand is carried out. Our results show that in the aeolian sand, the stream-wise wind speed fluctuations with a period (T) greater than 30 s has a small contribution to the turbulent kinetic energy, but its dominant sand flux plays an important role in the sand flux fluctuation intensity. Sand flux fluctuations (T > 30 s) with particle size smaller than 200 μm respond well to the stream-wise wind speed fluctuations. Sand flux fluctuations at different height (T > 30 s) have a higher correlation. Sand flux fluctuations with T < 30 s are not only poorly correlated along the height, but also poorly correlated with the sand flux fluctuations of different particle sizes. The results indicate that if the aeolian sand model is to be used to predict the spatial distribution of sand flux along the stream-wise direction, the stream-wise wind speed fluctuation with T > 30 s need to be considered in the model. The results of this paper have important guiding significance for the accurate prediction of dust storms and the design of sand control measures.
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Acknowledgements
This work was supported by a grant from the Ningxia Hui Autonomous Region Key Research and Development Project (No. 2021BEG03029 and 2020BEB04015), and National Natural Science Foundation of China (No. 12062023), as well as the helpful comments from referees which lead to a significant improvement of our work, the authors express their sincere appreciation to the support. The data that support the findings of this study are available from the corresponding author upon reasonable request.
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Bo, TL., He, Q. Characteristics of sand transport fluctuation in near-neutral atmospheric surface layer. Granular Matter 25, 13 (2023). https://doi.org/10.1007/s10035-022-01301-y
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DOI: https://doi.org/10.1007/s10035-022-01301-y