| 地形起伏对气流速度影响的风洞实验研究 |
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| 引用本文： | 李振山.地形起伏对气流速度影响的风洞实验研究[J].水土保持研究,1999,6(4):75-79. |
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| 作者姓名： | 李振山 |
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| 作者单位： | 北京大学城市与环境学系, 北京 100871 |
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| 摘 要： | 地形起伏主要通过对气流的扰动极大地影响着土壤风蚀特征。通过对4 种坡度下气流变化的风洞实验，发现坡面对气流的影响表现在两个方面，一是气流在爬坡过程中的速度除在坡角点略有下降外，整体上呈逐渐加强趋势，速度增加率与坡长呈良好的线性关系；二是在垂直方向上速度的增加率符合对数规律。前者使风蚀程度加强，后者使风蚀程度减弱，二者共同制约着坡面上土壤的风蚀特征。
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| 关 键 词： | 地形坡度 风洞实验 气流速度 风速廓线 土壤风蚀 |
Wind Tunnel Simulation of Flow Velocity on the Windward Slope |
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| Li Zhenshan.Wind Tunnel Simulation of Flow Velocity on the Windward Slope[J].Research of Soil and Water Conservation,1999,6(4):75-79. |
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| Authors: | Li Zhenshan |
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| Institution: | Department of Urban and Environmental Sciences, Beijing University Beijing 100871 |
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| Abstract: | By means of velocity perturbation of ariflow the landform has a significant effect on the soil erosion by wind.The wind tunnel simulation of the airflow on the windward slope shows that the velocity perturbs is of two change trends.Firstly the velocity increases along the up-slope;secondly the vertical rates of the velocity over the slope to that on the level surface at the same height above the bed-surface obeys by log-linear function.On the one hand the increase in the velocity strengthens the wind erosion of soil on the slope,but on the other hand the vertical rates weaken the wind erosion.Both the counter-actions control the feature of the solpes. |
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| Keywords: | the slope of landforms wind tunnel experiment airflow velocity velocity profiles soil wind erosion |
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