关键词: 防护林带, 防风效果, 透风系数, 幅宽, 形状

Abstract: Wind protection effects of forest beer with different widths and ventialtion coefficients have been analvsed bv data obtained from wind tunnel experiments. The results indicate that there is a significant difference between ventilation coefficients. The wind protection effects will decrease with increasing of forest beer width when the line numbers of forest beer are in same. Within the region influenced by wind velocity, distribution of wind velocity in front of forest beer (x>-dH) is in acoord with parabola pattern. And that of wind velocity in back of forest beer (|xI≤22H) is in accord with the systhesis of parabola and logarithm curre.

Key words: Shelterbelt, Wind protection effect, Ventilation coefficient, Width, From