Aerodynamic characteristics of Astragalus adsurgens vegetation based on mobile wind tunnel experiment
Aerodynamic roughness(Z0)and friction velocity(u*)reflect the interaction between underlying sur-face properties and the atmosphere,and vegetation plays an important role in regulating Z0 and u*.This experi-ment was conducted by planting vegetation(Astragalus adsurgens)in the field,setting up four vegetation cover-age and three vegetation layouts,and using a mobile wind tunnel for field experiments.The experimental results showed that:(1)As the input wind speed increases,there is a negative correlation between Z0 and u*,that is,as u* increases,Z0 shows a linear decreasing trend;Under the same input wind speed,as vegetation coverage in-creases,there is a positive correlation between Z0 and u*,which conforms to the logarithmic function form.(2)Z0 follows a logarithmic function variation pattern with vegetation coverage,and as vegetation coverage in-creases,there is a threshold phenomenon in Z0.(3)The size of Z0 with different vegetation layouts is in the order of two rows＞cross layout＞one row.(4)From the perspective of aerodynamics,it is proposed that Astragalus ad-surgens vegetation coverage is 30％,and its wind erosion prevention efficiency is strong when the layout is two rows and one belt.
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