Sheltering effect of a multiple-row Tamarix windbreak – a field study in Niatak, Iran
Sheltering effect of a multiple-row Tamarix windbreak – a field study in Niatak, Iran
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DOI：
10.1016/j.agrformet.2020.107937
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发表时间：
2020-06
影响因子：
6.2
通讯作者：
Mohsen Rezaei Torshizi;Abbas Miri;R. Davidson‐Arnott
中科院分区：
文献类型：
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作者：
Mohsen Rezaei Torshizi;Abbas Miri;R. Davidson‐Arnott
伊朗东南部的锡斯坦地区是该国主要沙尘暴地区之一。使用有效的防风林来减少沙尘暴的频率和强度至关重要。在一项实地研究中，通过获取防风林上风（x=− 100）、内部（x= 100 和 256）和顺风（x= 448 和 560）R c (x, z)（减风系数）的垂直和水平值，评估了 Niatak 地区多行防风林（14 行无叶柽柳）的遮蔽效果。在 z/h= 0.2–0.8 高度处，遮蔽效果的垂直剖面略有偏转，在防风林内观察到 R c (x, z) 值显着增加，这表明植被的粗糙度影响。防风林内的遮挡效果随着空气动力学粗糙度长度（z 0）的增加而增加。最大 R c (x, z) 值出现在防风林开始时 (x= 100)，此时 z 0 出现最大值。在顺风距离x= 448和560时，R c (x, z)值分别大于和小于逆风距离，揭示了防风林在植被之外50 h区域的遮挡作用。显着的遮蔽区域（防风林之外 50 小时和防风林之上 1.8 小时）和防风林降低的风速（x= 100 时 50%）以及防风林开始处的最小风速位置表明防风林的效率是最佳的。这主要归功于最佳的孔隙率（39%）和防风林的结构（多排设计）。
The Sistan region in southeastern Iran is one of the country's main dust storm areas. To reduce the frequency and intensity of dust storms using efficient windbreaks is critical. In a field study the sheltering effect of a multiple-row windbreak (14 rows of Tamarix aphylla) in the Niatak area was evaluated by obtaining the vertical and horizontal values of R c (x, z)(wind reduction coefficient) upwind (x=− 100), within (x= 100 and 256) and downwind (x= 448 and 560) of the windbreak. A slight deflection in the vertical profiles of the sheltering effect at a height of z/h= 0.2–0.8, a significant increase in the R c (x, z) values was observed within the windbreak that demonstrated the roughness influence of vegetation. The sheltering effect increased within the windbreak consistent with the increasing aerodynamic roughness length (z 0). The greatest R c (x, z) values was observed at the beginning of windbreak (x= 100), where the largest values of z 0 occurred. At downwind distances of x= 448 and 560 the values of R c (x, z) were respectively greater and lower than upwind values, revealing the sheltering effect of the windbreak in an area 50 h beyond the vegetation. Significant sheltered areas (50 h beyond and 1.8 h above the windbreak) and reduced wind speeds (50% at x= 100) by the windbreak and the location of minimum wind speed at the beginning of the windbreak demonstrates that the efficiency of the windbreak is optimum. This is mainly attributed to the optimal porosity (39%) and structure of the windbreak (multiple-row design).