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 experimen

作　　者：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 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)

机构地区：[1]陕西师范大学地理科学与旅游学院,陕西西安710119

出　　处：《中国沙漠》2024年第3期1-8,共8页Journal of Desert Research

基　　金：陕西省科技厅项目(2021JCW-17);国家自然科学基金面上项目(42171004,42071009);国家自然科学基金重点项目(41930641)。

摘　　要：空气动力学粗糙度(Z_(0))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Z_(0)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,Z_(0)和u^(*)存在负相关,即随着u^(*)增大Z_(0)呈线性减小趋势;相同输入风速下,随着植被盖度的增加,Z_(0)和u^(*)存在正相关,两者增加趋势符合对数函数形式。(2)Z_(0)与植被盖度符合对数函数变化规律,随着植被盖度增大Z_(0)出现阈值现象。(3)不同植被布局的Z_(0)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。Aerodynamic roughness(Z_(0))and friction velocity(u^(*))reflect the interaction between underlying surface properties and the atmosphere,and vegetation plays an important role in regulating Z_(0) 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 Z_(0) and u^(*),that is,as u^(*)increases,Z_(0) shows a linear decreasing trend;Under the same input wind speed,as vegetation coverage increases,there is a positive correlation between Z_(0) and u^(*),which conforms to the logarithmic function form.(2)Z_(0) follows a logarithmic function variation pattern with vegetation coverage,and as vegetation coverage increases,there is a threshold phenomenon in Z_(0).(3)The size of Z_(0) 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.

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 

分 类 号：K903[历史地理—人文地理学]