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Optimal design for vegetative windbreaks using 3D numerical simulations
Agricultural and Forest Meteorology ( IF 6.2 ) Pub Date : 2020-12-25 , DOI: 10.1016/j.agrformet.2020.108290
Zhiyi Guo , Xiaofan Yang , Xiaoxu Wu , Xueyong Zou , Chunlai Zhang , Hui Fang , Hongxu Xiang

Vegetative windbreaks are widely used to control wind erosion by reducing wind speed and attenuating sand movement, which motivates systematic research on optimal design for vegetative windbreaks. In this study, at the wind-tunnel scale, we conducted 3-D computational fluid dynamics (CFD) simulations with a realizable SST k-ω turbulence model that incorporates realistic geometries of vegetative windbreaks (Artemisia and Salix) to investigate wind dynamics around vegetative windbreaks and aid optimal design in aeolian engineering practice. The modified CFD models for vegetative windbreaks were first validated by comparing results with those from wind-tunnel experiments. Furthermore, we developed two new indexes (mRc and mBEI) based on the reduction coefficient (Rc(x,z)) and barrier effective index (BEI) to evaluate the shelter effect. Optimal designs including the structural parameters and arrangements for vegetative windbreaks were then determined as follows: (1) three-row windbreaks were more effective for both Artemisia and Salix windbreaks; inter-row spacings of 2.5–3hA and 1-1.5hS were optimal (where hA and hS are the heights of the shrubs) for Artemisia and Salix windbreaks, respectively; (2) a staggered arrangement worked better for both monospecific windbreaks; (3) a two-row-one-belt system with inter-belt spacing of 8hA and 10hS was optimal under middle-velocity conditions, while a three-row-one-belt system with inter-belt spacing of 16hA and 16hS was optimal under high-velocity conditions; (4) multispecific-vegetative windbreaks were optimal when considering velocity reduction, while a Salix-only windbreak system was optimal for shelter distance. This research is expected to advance fundamental understanding of wind dynamics around vegetative windbreaks and provide references for building vegetative windbreaks in arid regions.



中文翻译:

使用3D数值模拟进行植物防风林的优化设计

植物防风林被广泛用于通过降低风速和减弱沙运动来控制风蚀,这促使人们对植物防风林的最佳设计进行系统的研究。在这项研究中,在风洞范围内,我们使用可实现的SSTk-ω湍流模型进行了3D计算流体动力学(CFD)模拟,该模型结合了植物防风林的真实几何形状(),以研究植物周围的风动力学防风和在风能工程实践中帮助优化设计。通过将结果与风洞实验的结果进行比较,首先验证了用于植被防风的改良CFD模型。此外,我们开发了两个新指标(mRcmBEI)基于减少系数([RCXž)和屏障有效指数(BEI)来评估掩蔽效果。然后确定包括植物防风林的结构参数和布置在内的最佳设计:(1)三行防风林对柳属防风林均更有效;对于,最佳的行间距为2.5–3 h A和1-1.5 h S(其中h Ah S是灌木的高度)防风林;(2)交错布置对于两种单一防风林都更有效;(3)在中速条件下,皮带间间距为8 h A和10 h S的两行一皮带系统是最佳的,而皮带间间距为16的三行一皮带系统是最佳的在高速条件下,h A和16 h S最佳。(4)当考虑降低速度时,多植物植被防风林是最佳的,而柳树唯一的防风系统是避难所距离的最佳选择。这项研究有望增进对植物防风林周围风动态的基本了解,并为在干旱地区建立植物防风林提供参考。

更新日期:2020-12-25
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