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Experimental study on the effect of plant spacing, number of rows and arrangement on the airflow field of forest belt in a wind tunnel
Journal of Arid Environments ( IF 2.7 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.jaridenv.2020.104169
Hong Cheng , Chenchen Liu , Liqiang Kang

Abstract Forest belts play an important role in soil wind erosion control and the prevention of aeolian sand movement in arid and semiarid regions. In order to reveal the effect of plant spacing, number of rows, and arrangement on airflow of forest belt, the airflow fields were measured in a wind tunnel for artificial single-row forest belts with different plant spacings, forest belts with different numbers of rows with the same plant spacing, and two rows of forest belts with different arrangements. The results indicate that for the single-row forest belt, the downwind airflow decreases in the canopy area and then recovers exponentially. As the plant spacing increases, the characteristic length of the downwind airflow recovery of the forest belt and the distance at which the minimum wind speed is located both decrease approximately exponentially. As the number of rows in a forest belt increases, the downwind airflow speed in the canopy area decreases. The average reduction of downwind relative wind speed decreases with plant spacing and increases with the number of rows. A forest belt with staggered arrangement has lower downwind speeds and a longer characteristic length of airflow recovery than that in rectangular arrangements.

中文翻译:

株距、行数和排列方式对风洞林带气流场影响的试验研究

摘要 林带在干旱半干旱地区控制土壤风蚀和防止风沙运动方面具有重要作用。为了揭示株距、行数、排列方式对林带气流的影响,在风洞中对不同株距、不同行数林带的人工单行林带进行了气流场测量。株距相同,排列不同的两排林带。结果表明,对于单行林带,冠层下风气流减少,然后呈指数恢复。随着株距增大,林带下风气流恢复特征长度和最小风速所在距离均近似呈指数减小。随着林带行数的增加,林冠区域的顺风气流速度降低。顺风相对风速的平均减少量随着株距的增加而减小,随着行数的增加而增加。与矩形排列相比,交错排列的林带下风速较低,气流恢复特征长度较长。
更新日期:2020-07-01
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