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中国沙漠 ›› 2024, Vol. 44 ›› Issue (3): 1-8.DOI: 10.7522/j.issn.1000-694X.2023.00102

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基于野外移动风洞实验的沙打旺植被空气动力学特征研究

白子怡(), 董治宝(), 肖锋军, 李超, 南维鸽, 邵天杰, 孔玲玲, 马慧蓉, 池政   

  1. 陕西师范大学 地理科学与旅游学院,陕西 西安 710119
  • 收稿日期:2023-06-13 修回日期:2023-07-13 出版日期:2024-05-20 发布日期:2024-06-11
  • 通讯作者: 董治宝
  • 作者简介:董治宝(E-mail: zbdong@snnu.edu.cn
    白子怡(1994—),女,陕西榆林人,博士研究生,研究方向为风沙地貌学。E-mail: zybai@snnu.edu.cn
  • 基金资助:
    陕西省科技厅项目(2021JCW-17);国家自然科学基金面上项目(42171004);国家自然科学基金重点项目(41930641)

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   

  1. 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

摘要:

空气动力学粗糙度(Z0)和摩阻速度(u* )是反映下垫面与大气相互作用的空气动力学参数,植被对Z0u* 的调节起着重要作用。通过在野外种植沙打旺植被,设置4种植被盖度和3种植被布局,利用移动风洞进行原位测试。结果表明:(1)随着风速增大,Z0u* 存在负相关,即随着u* 增大Z0呈线性减小趋势;相同输入风速下,随着植被盖度的增加,Z0u* 存在正相关,两者增加趋势符合对数函数形式。(2)Z0与植被盖度符合对数函数变化规律,随着植被盖度增大Z0出现阈值现象。(3)不同植被布局的Z0为两行一带>交叉布局>一行一带。(4)从空气动力学角度提出沙打旺植被盖度为30%,布局为两行一带布局时,防风蚀效能较强。

关键词: 空气动力学粗糙度, 摩阻速度, 植被盖度, 植被布局, 移动风洞

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 Z0 and 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

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