The influence of vegetation coverage on the wind sand flow structure and sediment transport rate
Received date: 2023-05-19
Revised date: 2023-06-19
Online published: 2024-03-19
Soil wind erosion is an important threat to the global ecological and environmental security of arid and semi-arid area. Vegetation can effectively reduce the risk of soil wind erosion by reducing wind speed and capturing soil particles. At present， people's understanding of the optimal pattern and coverage of vegetation controlling soil wind erosion still needs to be deepened. With the help of a mobile wind tunnel in the field， this article measured the response of surface sediment transport rate and wind sand flow structure to the coverage of herbaceous plants （Astragalus adsurgens）. The results show that： （1） When the vegetation coverage is small， the distribution curve of wind sand flow structure follows the exponential function distribution law. With the increase of vegetation coverage， the curve shape appears differentiation. （2） Vegetation coverage can effectively reduce the intensity of soil wind erosion and raise the height of sand transport. （3） The surface aerodynamic roughness and vegetation coverage follow a logarithmic function variation law， and their growth rate gradually decreases and eventually approaches zero with the increase of vegetation coverage. There is a threshold phenomenon in the aerodynamic roughness of the underlying surface. （4） The optimal coverage of Astragalus adsurgens for controlling soil wind erosion is about 30%， which can effectively suppress about 90% of wind erosion below a height of 20 cm.
Ziyi Bai , Zhibao Dong , Weige Nan , Fengjun Xiao , Chao Li , Tianjie Shao , Lingling Kong , Xiaokang Liu , Aiming Liang , Zheng Chi . The influence of vegetation coverage on the wind sand flow structure and sediment transport rate[J]. Journal of Desert Research, 2024 , 44(2) : 25 -34 . DOI: 10.7522/j.issn.1000-694X.2023.00088
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