In this article, we investigate the regulation of wind regime by windbreaks of different designs formed by thinning. In particular, we look at the effects of thinning in 52–67 years old oak stands. Based on our results, different windbreaks designs of foliage and aphyllous states influence wind regime of adjacent fields. This research shows that windbreaks of sieve-looking and blown designs with an average optical porosity of 20–25% between the trunks and 5–10% in the crowns have better aerodynamic properties than windbreaks of dense design. The uniformity coefficient of reduction in the airflow ranged between 0.42 and 0.76. There is a clear tendency to decrease wind velocity at a distance of 15H in the leeward side, which has a beneficial effect on agronomic productivity of the surrounding areas. With the transition of windbreaks from full foliage to aphyllous state the optical trunk porosity of plantations increases 1.8–3.0 times, and in crowns—2.5–4.0 times. The windbreaks of blown and sieve-looking designs in the aphyllous state with an average porosity between trunks of 40–50% and in the crowns of 20–30%, regulate more effectively the wind regime in comparison with windbreaks of dense design. According to our findings, the windbreaks of blown design with porosity 40–50% between the trunks and 0–10% in crowns and sieve-looking design have the best ameliorative properties in the region.

中文翻译：

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乌克兰中部减薄形成的各种设计防风林的空气动力学特性

在本文中，我们研究了由减薄形成的不同设计的防风林对风况的调节。我们特别研究了 52-67 年橡木林分间伐的影响。根据我们的研究结果，树叶和无叶状态的不同防风林设计会影响相邻田地的风况。这项研究表明，与密集设计的防风林相比，具有 20-25% 的树干之间和 5-10% 的树冠平均光学孔隙率的筛状和吹制设计的防风林具有更好的空气动力学特性。气流减少的均匀系数介于 0.42 和 0.76 之间。背风侧 15H 处有明显的风速降低趋势，对周边地区的农艺生产力有有利影响。随着防风林从全叶状态过渡到无叶状态，人工林的光学树干孔隙率增加了 1.8-3.0 倍，而在树冠中则增加了 2.5-4.0 倍。与密集设计的防风林相比，在树干之间的平均孔隙率为 40-50% 和树冠之间的平均孔隙率为 20-30% 的吹制和筛状设计的防风林，可以更有效地调节风况。根据我们的研究结果，树干之间孔隙率为 40-50% 和冠部孔隙率为 0-10% 的吹制设计的防风林和筛状设计在该地区具有最好的改善特性。与密集设计的防风林相比，在树干之间的平均孔隙率为 40-50% 和树冠之间的平均孔隙率为 20-30% 的吹制和筛状设计的防风林，可以更有效地调节风况。根据我们的研究结果，树干之间孔隙率为 40-50% 和冠部孔隙率为 0-10% 的吹制设计的防风林和筛状设计在该地区具有最好的改善特性。与密集设计的防风林相比，在树干之间的平均孔隙率为 40-50% 和树冠之间的平均孔隙率为 20-30% 的吹制和筛状设计的防风林，可以更有效地调节风况。根据我们的研究结果，树干之间孔隙率为 40-50% 和冠部孔隙率为 0-10% 的吹制设计的防风林和筛状设计在该地区具有最好的改善特性。