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| 直立植物防沙措施粗糙特征的模拟实验 | |
| 引用本文： | 董治宝,高尚玉.直立植物防沙措施粗糙特征的模拟实验[J].中国沙漠,2000,20(3):260-263. |
| 作者姓名： | 董治宝 高尚玉 |
| 作者单位： | 1. 中国科学院,寒区旱区环境与工程研究所,甘肃,兰州,730000 2. 美国农业部,大斯普林土壤风蚀研究站,USDA-ARS,Big,Spring,TX79720-0909,U.S.A 3. 北京师范大学,资源科学研究所环境演变与自然灾害教育部重点实验室,北京,100875 |
| 基金项目： | 中国科学院“百人计划”项目!——风沙物理学及中国科学院出国留学回国人员择优基金资助 |
| 摘 要： | 通过风洞模拟实验研究了直立植物防沙措施的粗糙特征及其影响因素。实验结果表明，在各种一定风速条件下，对数风速廓线中的粗糙度Ｚ０ＳＦ值随植物密度的增加呈幂函数增加，幂函数的指数〈１；而在各种一定植物密度条件下，Ｚ０随风速的增大而减溃，遵循单分子增长风线的指数函数。根据实验结果建立的包含风速和植物密度两个因子的Ｚ０的双因子综合模型对Ｚ０的预测值与实验值吻合得比较好。对数风速郭线中的Ｚ０是一个反映近地表气 |
| 关 键 词： | 粗糙度 空气动力粗糙度 下垫面粗糙度 直立植物 |
| 修稿时间： | : |
Modeling the Roughness Effect of Blown-sand-controlling Standing Vegetation in Wind Tunnel |
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| DONG Zhi-bo,Donald W.Fryrear,GAO Shang-yu.Modeling the Roughness Effect of Blown-sand-controlling Standing Vegetation in Wind Tunnel[J].Journal of Desert Research,2000,20(3):260-263. | |
| Authors: | DONG Zhi-bo Donald WFryrear GAO Shang-yu |
| Abstract: | The roughness properties of standing vegetation and their influential factors were studied in wind tunnel by using artificial plant models. It was found that with any wind velocity the roughness factor (\%Z\-0\%) in the log law wind profile increased with the vegetation density by power function, the exponent<1; and decreased with wind velocity by some kind of exponential function. The predicted \%Z\-0\% values by the multivariate model including wind velocity and vegetation density based on experiment data matched those measured reasonably well. Therefore, the \%Z\-0\% in the log law is a physical dimension reflecting the interaction of the near surface airflow and surface conditions, correcting the common view that \%Z\-0\% is only determined by the surface conditions. It is suggested that cautions should be taken in applying the concepts of aerodynamic roughness and surface roughness. |
| Keywords: | roughness aerodynamic roughness surface roughness standing vegetation |
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