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风速大小、林带疏透度及高度都会对林带周围气流产生影响,使气流在林带两侧发生分离或积聚,从而形成不同的防护功能区。为探求林带结构对防风效应的影响机理,选取10组高度和疏透度不同的林带模型,对其防风效应进行了风洞模拟实验,通过绘制加速率等值线图及其变化趋势线、防风效应图,并计算不同结构单排林带的有效防护距离,进而揭示风速、林带疏透度和高度对林带上风向和下风向风速、防风效应和有效防护距离的影响规律。
The size of the wind speed, the density and the height of the forest belt all affect the airflow around the forest belt, causing the airflow to separate or accumulate on both sides of the forest belt, thus forming different protective function zones. In order to explore the mechanism of shelterbelt effect on windbreak effect, 10 groups of shelterbelt models with different heights and degrees of penetration were selected to simulate wind-sheltering effects in wind tunnel. Through drawing up the isoline map and its trend line, And the effective protection distances of single-row shelterbelts with different structures are calculated, and then the influence laws of wind speed, shelter and height of shelterbelts on the wind speed, windward effect and effective protection distance on wind direction and downwind wind direction are revealed.