摘要
林带的防风效能既与林带本身的结构因子如:林带结构类型、疏透度或透风系数、截面形状、高度、宽度等有关,也受天气和地面状况等因子的影响。因此,通过野外观测研究,弄清单因子对不同透风系数、幅宽对林带的防风效能的影响很困难,采用风洞模型模拟试验,可以取得满意的结果。本试验于1989年6月在日本北海道大学环境研究科风洞试验室进行。
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.
出处
《林业科学》
EI
CAS
CSCD
北大核心
1991年第5期550-554,共5页
Scientia Silvae Sinicae
关键词
防护林带
防风效果
数字模拟
Shelterbelt
Wind protection effect
Ventilation coefficient
Width
From
