中国地理科学(英文版) ›› 2012, Vol. 22 ›› Issue (2): 178-187.

• 论文 • 上一篇    下一篇

Thermodynamic Effects on Particle Movement: Wind Tunnel Simulation Results

NIU Qinghe1, 2, 3, QU Jianjun1, 2, 3, ZHANG Kecun1, 2, 3, LIU Xianwan1, 2, 3   

  1. (1. Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences, Lanzhou 730000, China; 2. Dunhuang Gobi and Desert Research Station, Cold and AridRegions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Dunhuang 736200, China;
    3. Gansu Center for Sand Hazard Reduction Engineering and Technology, Lanzhou 730000, China)
  • 出版日期:2012-03-05 发布日期:2012-04-10

Thermodynamic Effects on Particle Movement: Wind Tunnel Simulation Results

NIU Qinghe1, 2, 3, QU Jianjun1, 2, 3, ZHANG Kecun1, 2, 3, LIU Xianwan1, 2, 3   

  1. (1. Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences, Lanzhou 730000, China; 2. Dunhuang Gobi and Desert Research Station, Cold and AridRegions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Dunhuang 736200, China;
    3. Gansu Center for Sand Hazard Reduction Engineering and Technology, Lanzhou 730000, China)
  • Online:2012-03-05 Published:2012-04-10

摘要:

Sand/dust storms are some of the main hazards in arid and semi-arid zones. These storms also influence global environmental changes. By field observations, empirical statistics, and numerical simulations, pioneer researchers on these natural events have concluded the existence of a positive relationship between thermodynamic effects and sand/dust storms. Thermodynamic effects induce an unsteady stratified atmosphere to influence the process of these storms. However, studies on the relationship of thermodynamic effects with particles (i.e., sand and dust) are limited. In this article, wind tunnel with heating was used to simulate the quantitative relationship between thermodynamic effects and particle movement on different surfaces. Compared with the cold state, the threshold wind velocity of particles is found to be significantly decrease under the hot state. The largest decrease percentage exceedes 9% on fine and coarse sand surfaces. The wind velocity also has a three-power function in the sand transport rate under the hot state with increased sand transport. Thermodynamic effects are stronger on loose surfaces and fine particles, but weaker on compacted surfaces and coarse particles. 

关键词: thermodynamic effect, threshold wind velocity, drifting sand flux structure, sand transport rate, wind tunnel simulation

Abstract:

Sand/dust storms are some of the main hazards in arid and semi-arid zones. These storms also influence global environmental changes. By field observations, empirical statistics, and numerical simulations, pioneer researchers on these natural events have concluded the existence of a positive relationship between thermodynamic effects and sand/dust storms. Thermodynamic effects induce an unsteady stratified atmosphere to influence the process of these storms. However, studies on the relationship of thermodynamic effects with particles (i.e., sand and dust) are limited. In this article, wind tunnel with heating was used to simulate the quantitative relationship between thermodynamic effects and particle movement on different surfaces. Compared with the cold state, the threshold wind velocity of particles is found to be significantly decrease under the hot state. The largest decrease percentage exceedes 9% on fine and coarse sand surfaces. The wind velocity also has a three-power function in the sand transport rate under the hot state with increased sand transport. Thermodynamic effects are stronger on loose surfaces and fine particles, but weaker on compacted surfaces and coarse particles. 

Key words: thermodynamic effect, threshold wind velocity, drifting sand flux structure, sand transport rate, wind tunnel simulation