Li Zhenshan.Wind Tunnel Simulation of Flow Velocity on the Windward Slope[J].Research of Soil and Water Conservation,1999,6(04):75-79.
地形起伏对气流速度影响的风洞实验研究
- Title:
- Wind Tunnel Simulation of Flow Velocity on the Windward Slope
- Keywords:
- the slope of landforms; wind tunnel experiment; airflow velocity; velocity profiles; soil wind erosion
- 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。
- 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.
参考文献/References:
1 雅克波夫Tφ.土壤风蚀及其防止.北京:农业出版社,1955
2 Frank A,Kocurek G.Airflow up the Stoss Slope of Sand Dunes:Limitations of Current Understanding.Geomorphology,1996,17(1):47～54
3 Howard A D,Morton J B,Gad-el-Hak M et al.Sand Transport Model of Barchan Dune Equilibrium.Sedimentlolgy,1978,25:307～338
4 Mulligan K R.Velocity Profiles Measured on the Windward Slope of A Transverse Dune.Earth Surface Processes and Landforms,1988,13:573～582
5 Weng W S.Hunt J C R,Carruthers D J et al.Airflow and Sand Transport over Sand.Acta Mechanica,Supplement 1999,2:1～22.
6 Wings G S,Livingstone I,Warren A.The Role of Streamline Curvature in Sand Dune Dynamics.Geomorphology.1996,17:29～46
备注/Memo
收稿日期:1999-9-25
基金项目:国家自然科学基金（批准号49601002）