林带下风防护区中风速水平分布的研究

本文通过对林带、风障等多次观测,论证出在风与林带垂直时,因林带阻摩作用引起的林后风速水平变化,服从对数分布规律。即:本文在建立林后风速水平分布方程同时,还给出了有关参数的计算、预测方法,以及利用公式的若干应用实例。     

RESEARCH ON THE HORIZONTAL DISTRIBUTION OF WIND SPEED IN THE WIND-PROTECTION AREA OF THE SHELTERBELT

Observations of shelterbelts and windbreaks have demonstrated that the horizontal variations of the wind speed at the leeward of the shelterbelt caused by the friction of the shelterbelt abide by the law of logarithmic distribution,i.e.when the wind direction is perpendicular to the shelterbelt.Meanwhile, calculation of the relative parameters, the protecting methods and some examples of practical applications of the formula have also been described in the article.     

林网中的风速分布规律和防风效应

本文从单林带防护区中风速分布模式出发,推导了林网网格中风速分布的规律:网格中风矢量的分量服从误差函数分布模式或二元幂函数的对数模式;风矢量本身服从这些模式的矢量合成模式。利用网格中风速矢量合成模式,可以计算出任何林带特征,任意网格面积、形状和任意风偏角条件下网格中的风速分布和防风效应。野外模型试验结果与理论计算结果有较为一致的关系。     

WIND SPEED DISTRIBUTION REGULARITY AND WIND REDUCTION EFFECT OF SHELTER NET

Wind speed distribution regularities in a shelter mesh (S. M.) have been deduced from the wind speed distribution in the sheltered area of a single shelter beh (S. B.).The components of a wind vector in a mesh follow the error function distribution model or the logarithmic model of 2-variable power function.The wind vector itself follows the vector composition model of these models.We can calculate the wind speed distribution and wind reduction effect of a mesh under the conditions of any shelter-belt characteristics, any size and shape of a mesh and any wind inclination angle with this model. The results of our field model experiment are in better agreement with the theoretically calculated results.