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
Aerodynamic characteristics of Astragalus adsurgens vegetation based on mobile wind tunnel experiment
白子怡 1董治宝 1肖锋军 1李超 1南维鸽 1邵天杰 1孔玲玲 1马慧蓉 1池政1
作者信息
- 1. 陕西师范大学地理科学与旅游学院,陕西西安 710119
- 折叠
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Z0和u*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,Z0和u*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,Z0和u*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.
Abstract
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.
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Key words
aerodynamic roughness/friction velocity/vegetation coverage/vegetation layout/mobile wind tunnel引用本文复制引用
基金项目
陕西省科技厅项目(2021JCW-17)
国家自然科学基金面上项目(42171004)
国家自然科学基金面上项目(42071009)
国家自然科学基金重点项目(41930641)
出版年
2024
NETL
NSTL
万方数据