植被条件对近地表风速垂线分布的影响

The Effect of Vegetation Condition on Wind Velocity Perpendicular Line Distribution in the Near Ground

本文对有无植被时近地表风速垂线分布进行了对比,定量地研究了植被条件对近地表风速垂线分布的影响,确定了不同植被条件与风速减小率之间的关系.通过研究发现:不同高度上的风速减小率随着植被模型行距或株距的增加均呈减小的趋势,高度为10cm和5cm的植被模型,其4cm高度的风速减小率均随行距和株距的变化均服从相似的指数函数形式,通过对比拟合曲线方程系数可知,株距的变化对风速的改变影响更大.不同高度上的风速减小率随植被侧影盖度均呈指数递增的趋势,通过两种高度的植被模型之间的对比可知,植株高度较高,密度较小植被的防风蚀效果可由植株高度较矮、种植密度大的植被达到.

The text has carried on the contrast to the wind velocity perpendicular line distribution in the near ground, has studied the effect of vegetation condition on wind velocity perpendicular line distribution in the near ground , has confirmed the relationship between different vegetation conditions and wind speed reduction rate through the research which shows that the wind speed reduction rate that in different heights presents the trend reduced as the row or stem spacing of the vegetation model increase, the vegetation model height of 10cm and 5cm with the row spacing and stem spacing changing. At the height of 4cm, the wind speed reduction rate all obey the similar exponential function form. Through comparing with fit curve equation coefficients, the changes of row spacing influence wind speed heavier. The wind speed reduction rate that in different height with vegetation silhouette degree present the trend that the index increases progressively. Through the contrast between the vegetation models of two kinds of height know that with regard to the effect of proofing wind corrode, the short planting and the large density vegetation are better than the high planting and the little density vegetation.