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		一个基于粗糙元方向比率和空气动力学粗糙度的起动摩阻风速模式
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			An improved scheme for modeling wind friction threshold velocity dependent on the aspect ratio of individual element and aerodynamic roughness length
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| 图2. 风洞跃移起动观测实景(1-摄像头, 2-胶带纸,3-皮托管) | 
| Fig.2. A picture of observation on saltation threshold (1- small camera, 2- sticky tape, 3- Pitot tubes) | 
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