Wind Tunnel Study of Soil Crust Area and Distribution Affecting on Wind Erosion
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S157

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    Abstract:

    Soil crust,which is an important factor affecting wind erosion,is widely distributed in arid and semi-arid regions.In this paper, taking the surface soils around the eastern mining area of the Junggar Basin as the object, wind tunnel test combined with soil wind erosion sensor were used to study the changes of soil wind erosion, sand flow structure and soil particle release under different soil crust and wind speed conditions by controlling soil crust cover rate and crust distribution. The results showed that:(1) Wind erosion increased significantly with the increase of wind speed and decreased significantly with the increase of soil crust cover rates.The wind erosion amount of uniform distribution was lower than that of centralized distribution. (2) The height of wind-sand flow increased with the increase of wind speed, and the collection at the height of 0~3 cm accounted for about 80% of the total. The wind speed of 14 m/s could make the soil saltation occur, and the soil skinning rate of 50% could effectively inhibit the saltation phenomenon of soil particles. (3) The number and energy of particle collision increased with the increase of wind speed and decreased with the increase of crust cover rates. The wind speed of the first particle collision increased with the increase of the crust cover rates; the number and energy of particle collision increased to the maximum value in the period when the wind speed continued to increase, and began to decrease after the wind speed was stable. It dropped to the stable value around 120 s, and then no obvious fluctuation occurred, and no particle collision occurred during the period when the wind speed was decreasing.

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History
  • Received:November 14,2019
  • Revised:
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  • Online: May 15,2020
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