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Journal of Desert Research ›› 2020, Vol. 40 ›› Issue (1): 166-172.DOI: 10.7522/j.issn.1000-694X.2019.00070

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Characteristics of instantaneous sediment transport in steady aeolian sand transport

Kang Liqiang, Gao Yongqing, Zhang Wen, Zou Xueyong   

  1. State Key Laboratory of Earth Surface Processes and Resource Ecology/Engineering Center of Desertification and Blown-Sand Control of Ministry of Education, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
  • Received:2019-07-05 Revised:2019-08-22 Online:2020-01-20 Published:2020-01-18

Abstract: In aeolian sand transport, the movement of sand particles shows unstable characteristics even though the freestream wind speed is constant. In this paper, the sand movement over a period of time is measured by PIV (particle image velocimetry) in wind tunnel. Then the calculated method of instantaneous parameters such as mean particle diameter, particle number density, mean horizontal particle velocity and sand flux are also proposed based on the PIV technology, in which the vertical distribution of mean particle size is considered for the calculation of sand flux. The results show that when the freestream wind speed is constant, the time series of mean particle diameter, particle number density, mean horizontal particle velocity and sand flux show an obvious fluctuation. The standard deviations of mean particle diameter and mean horizontal particle velocity increase with increasing height, while the standard deviations of particle number density and sand flux decrease with height. The relative standard deviations of these parameters increase with increasing height.

Key words: aeolian sand transport, instantaneous transport, wind tunnel experiment

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