Effect of Dry Vegetation Cover on Surface Sand-carrying Wind Structure Along Highways

Dong Mei; Tu Ya; Li Juhe

doi:10.13961/j.cnki.stbctb.20230508.001

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Effect of Dry Vegetation Cover on Surface Sand-carrying Wind Structure Along Highways

- Effect of Dry Vegetation Cover on Surface Sand-carrying Wind Structure Along Highways
- Bulletin of Soiland Water Conservation Vol. 43, Issue 4, Pages: 17-23(2023)
- 作者机构：
  
  1. 内蒙古农业大学能源与交通工程学院,内蒙古,呼和浩特,010018
  2. 内蒙古农业大学机电工程学院,内蒙古,呼和浩特,010018
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.20230508.001
  CLC： S157
- Published：2023
- 稿件说明：
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Dong Mei, Tu Ya, Li Juhe. Effect of Dry Vegetation Cover on Surface Sand-carrying Wind Structure Along Highways[J]. Bulletin of Soiland Water Conservation, 2023, 43(4): 17-23.
DOI：

Dong Mei, Tu Ya, Li Juhe. Effect of Dry Vegetation Cover on Surface Sand-carrying Wind Structure Along Highways[J]. Bulletin of Soiland Water Conservation, 2023, 43(4): 17-23. DOI： 10.13961/j.cnki.stbctb.20230508.001.

摘要

[目的] 以内蒙古S105草原公路沿线地表为研究对象，探讨挟沙风作用下干枯植被覆盖度对风沙流结构的影响，旨在为防治公路两侧土壤风蚀提供理论参考依据。[方法] 采用风洞模拟试验，在0%，20%，40%和50%覆盖度水平下测定输沙率。[结果] 在挟沙风作用下，输沙率随干枯植被覆盖度的增大而递减，最大输沙率点的高度层不断上升。覆盖度为0%时，输沙率随高度的增加呈指数函数规律降低；覆盖度为20%，40%和50%时，输沙率随高度的增加呈递减→递增→递减→趋于平缓的变化规律；在85 mm高度以下符合多项式函数关系，85 mm高度以上符合指数函数关系。随覆盖度的增大总输沙量递减，最大抗风蚀效率达65.73%。[结论] 干枯植被覆盖显著影响地表风沙流结构，可削弱挟沙风侵蚀力，是抑制公路沿线地表土壤风蚀沙化的有效措施。

Abstract

[Objective] The influence of dry vegetation cover on the structure of wind-blown sand flow under the action of sand-carrying wind of S105 in Inner Mongolia Autonomous Region was studied in order to provide a theoretical reference for the prevention of soil wind erosion on both sides of a grassland highway. [Methods] Sediment transport rates were measured at 0%

20%

40%

and 50% vegetation cover levels by wind-tunnel simulation tests. [Results] Under the action of sand-carrying wind

the sediment transport rate decreased as dry vegetation cover increased

and the height of the maximum sediment transport rate rose as cover increased. When vegetation cover was 0%

the sediment transport rate decreased exponentially as height increased. As vegetation cover increased to 20%

40%

and 50%

the sediment transport rate decreased

then increased

then decreased

and then tended to be flat as height concurrently increased. These results can be described by a polynomial function below 85 mm height and by an exponential function above 85 mm height. Total sediment discharge decreased as vegetation coverage incrased

and the maximum anti-wind erosion efficiency was 65.73%. [Conclusion] Dry vegetation cover significantly affected the structure of surface wind-blown sand flow

which can weaken the erosion force of sand-carrying wind. Dry vegetation cover is an effective means of inhibiting wind erosion and desertification of surface soil along highways.

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