Aerodynamic characteristics of Astragalus adsurgens vegetation based on mobile wind tunnel experiment

doi:10.7522/j.issn.1000-694X.2023.00102

Journal of Desert Research ›› 2024, Vol. 44 ›› Issue (3): 1-8.DOI: 10.7522/j.issn.1000-694X.2023.00102

Aerodynamic characteristics of Astragalus adsurgens vegetation based on mobile wind tunnel experiment

Ziyi Bai(), Zhibao Dong(), Fengjun Xiao, Chao Li, Weige Nan, Tianjie Shao, Lingling Kong, Huirong Ma, Zheng Chi

School of Geography and Tourism，Shaanxi Normal University，Xi'an 710119，China

Received:2023-06-13 Revised:2023-07-13 Online:2024-05-20 Published:2024-06-11
Contact: Zhibao Dong

Abstract

Abstract:

Aerodynamic roughness （Z₀） and friction velocity （u^* ） reflect the interaction between underlying surface properties and the atmosphere， and vegetation plays an important role in regulating Z₀ and u^* . This experiment was conducted by planting vegetation（Astragalus adsurgens）in the field， setting up four vegetation coverage 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 Z₀and u^*， that is， as u^* increases， Z₀ shows a linear decreasing trend； Under the same input wind speed， as vegetation coverage increases， 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 increases， 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 adsurgens vegetation coverage is 30%， and its wind erosion prevention efficiency is strong when the layout is two rows and one belt.

Key words: aerodynamic roughness, friction velocity, vegetation coverage, vegetation layout, mobile wind tunnel

CLC Number:

K903

Ziyi Bai, Zhibao Dong, Fengjun Xiao, Chao Li, Weige Nan, Tianjie Shao, Lingling Kong, Huirong Ma, Zheng Chi. Aerodynamic characteristics of Astragalus adsurgens vegetation based on mobile wind tunnel experiment[J]. Journal of Desert Research, 2024, 44(3): 1-8.

Figures/Tables 10

Fig.1 Overview of wind tunnel experimental section

Fig.2 Overview of experimental equipment and experimental places

Fig.3 Variation of u* and Z0 under different wind speeds （three layouts， four coverage）

Fig.4 Variation of Z0 and u* under different vegetation coverage （four wind speeds）

Fig.5 Variation of u* and Z0 under different vegetation coverage （three layouts， four wind speeds）

Fig.6 Variation of u* and Z0 under different wind speeds （three layouts， four coverage）

Fig.7 Variation of aerodynamic roughness with vegetation coverage （three layouts， four wind speeds）

Table 1 Fitting function of aerodynamic roughness and vegetation coverage

风速/(m·s^-1)	一行一带	两行一带	交叉布局
7	y = 3.6385ln(x) + 10.099	y = 5.6949ln(x) + 14.364	y = 5.2472ln(x) + 12.557
7	R2 = 0.7574	R2 = 0.9573	R2 = 0.9951
9	y = 4.1391ln(x) + 10.239	y = 5.5931ln(x) + 13.987	y = 4.9812ln(x) + 12.093
9	R2 = 0.8839	R2 = 0.968	R2 = 0.9995
11	y = 4.2854ln(x) + 10.201	y = 5.4816ln(x) + 13.664	y = 4.9067ln(x) + 11.905
11	R2 = 0.8627	R2 = 0.9661	R2 = 0.998
13	y = 4.3141ln(x) + 10.149	y = 5.8139ln(x) + 14.036	y = 5.3915ln(x) + 12.475
13	R2 = 0.8387	R2 = 0.95	R2 = 0.9998

Fig.8 Variation of aerodynamic roughness with vegetation coverage （three layouts， four mean wind speeds）

Fig.9 Variation of aerodynamic roughness with vegetation coverage under different layouts （four wind speeds）

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Aerodynamic characteristics of Astragalus adsurgens vegetation based on mobile wind tunnel experiment

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