中国沙漠 ›› 2020, Vol. 40 ›› Issue (1): 166-172.DOI: 10.7522/j.issn.1000-694X.2019.00070

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亢力强, 高咏晴, 张文, 邹学勇   

  1. 北京师范大学 地理科学学部 地表过程与资源生态国家重点实验室/防沙治沙教育部工程研究中心, 北京 100875
  • 收稿日期:2019-07-05 修回日期:2019-08-22 出版日期:2020-01-20 发布日期:2020-01-18
  • 作者简介:亢力强(1976-),男,河北人,博士,研究方向为风沙物理。
  • 基金资助:

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

摘要: 风沙流中沙粒运动在来流风速不变时也会表现出非稳态特征。在风洞内利用粒子图像测速系统(PIV)测量了风沙运动的时间序列,并基于PIV测量技术提出风沙流中沙粒平均直径、数密度、平均水平速度和输沙通量等参数在某一时刻的计算方法,其中输沙通量的计算考虑沙粒大小垂向分布的影响。结果表明:来流风速不变时,沙粒平均直径、数密度、平均水平速度和输沙通量随时间具有明显的波动性;沙粒平均直径和平均水平速度的标准偏差一般随高度增加而增加,沙粒数密度和输沙通量标准偏差随高度增大而减小;这些参数的相对标准偏差均随高度增加而增大。

关键词: 风沙流, 瞬态输沙, 风洞实验

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