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Scaling laws for liftoff velocity for wind-transported particles during particle-bed collisions
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  • ChanWen JIANG,
  • Zhengcai Zhang,
  • Zhibao Dong,
  • Xiaoyan Wang,
  • Fengjun Xiao
Weinan Normal University

Corresponding Author:[email protected]

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Zhengcai Zhang
Northwest Institute of Eco-environment and Resources, Key Laboratory of Desert and Desertification, Chinese Academy of Sciences
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Zhibao Dong
School of Geography and Tourism, Shaanxi Normal University
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Xiaoyan Wang
College of Agricultural Business, Weinan Normal University
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Fengjun Xiao
Shaanxi Normal University
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We performed wind tunnel studies of sand–bed collisions with natural sand particles and found an impact angle of 10.5o over a loose bed, and calculated the critical impact velocity (vic ≅ 1.2027 m s-1). The number of splashing particles (Ns) increased linearly with vi, but the coefficient of restitution CoR decreased linearly with vi. The momentum lost through frictional processes αlost was insensitive to vi, with a value of 0.2466. The mean splash velocity increased with vi for vi < 7 m s-1, and gradually reached its maximum value (0.7534 m s-1) at vi = 7 m s-1, whereas decreased slowly with vi for vi> 7 m s-1 and gradually approached a constant (0.6137 m s-1). In addition, we developed a probability distribution model for liftoff velocity. Our results emphasize the crucial role of the impact angle and have significant consequences for modeling sand–bed collisions in a natural environment.