Wind and Structures

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The motion rule of sand particles under control of the sand transportation engineering

  • Xin, Lin-gui (College of Water Resources and Architectural Engineering, Shihezi University) ;
  • Cheng, Jian-jun (College of Water Resources and Architectural Engineering, Shihezi University) ;
  • Chen, Bo-yu (College of Water Resources and Architectural Engineering, Shihezi University) ;
  • Wang, Rui (College of Water Resources and Architectural Engineering, Shihezi University)
  • Received : 2017.12.06
  • Accepted : 2018.07.10
  • Published : 2018.10.25
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Abstract

In the desert and Gobi regions with strong wind and large sediment discharge, sand transporting engineering is more effective than sand blocking and sand fixing measures in sand prevention. This study uses the discrete phase model of 3D numerical simulation to study the motion trail, motion state and distribution rule of sand particles with different grain diameters when the included angle between the main shaft of the feather-row lateral transportation sand barrier and the wind direction changes, and conducts a comparison in combination with the wind tunnel test and the flow field rule of common sand barrier. According to the comparison, when wind-sand incoming flow passes through a feather-row sand barrier, sand particles slow down and deposit within the deceleration area under the resistance of the feather-row sand barrier, move along the transportation area formed by the transportation force, and accumulate as a ridge at the tail of the engineering. With increasing wind speed, the eolian erosion of the sand particles to the ground and the feather-row sand barrier is enhanced, and the sand transporting quantity and throw-over quantity of the feather-row sand barrier are both increased. When sand particles with different grain diameters bypass the feather-row sand barrier, the particle size of the infiltrating sands will increase with the included angle between the main shaft of the feather-row sand barrier and the wind direction. The obtained result demonstrates that, at a constant wind speed, the flow field formed is most suitable for the lateral transportation of the wind-drift flow when the included angle between the main shaft of the feather-row sand barrier lateral transportation engineering and the wind speed is less than or equal to $30^{\circ}$.

Keywords

Acknowledgement

Supported by : National Natural Sciences Foundation of China, China Postdoctoral Science Foundation

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