Jamily F. Stocco, Frédéric Murzyn, Jean-Luc Harion, Bruno Furieri, Jane M. Santos
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引用次数: 0
Abstract
Vegetative barriers are commonly used to reduce wind velocity and mitigate dust dispersion and aeolian erosion. While their effectiveness has been widely demonstrated, the influence of plant spatial arrangement—particularly in multi-row configurations with varying heights—remains underexplored. This study presents a wind tunnel investigation of airflow modification by artificial vegetation models arranged in three configurations: a single row of trees and two multi-row layouts combining trees and shrubs (MR1: trees upstream and shrubs downstream; and MR2: shrubs upstream and trees downstream). Based on 2D laser Doppler velocimetry measurements, both streamwise (U) and vertical (V) components together with Reynolds shear stress (\(\overline{u'v'}\)) were analyzed to study the wake dynamics. The results show that MR1 (trees upstream) induces a more intense velocity reduction near the barrier, with 28% of the downstream area exhibiting a reduction in the streamwise velocity greater than 60%, and the mean reduction of the streamwise velocity is 57%, indicating stronger near-surface sheltering. In contrast, MR2 (shrubs upstream) promotes a smoother and more extended velocity recovery profile, with a mean reduction of streamwise velocity of 46%, favoring long-range mitigation. Despite having similar porosity, the vertical distribution of solid elements in MR1 increases the effective frontal blockage, enhancing aerodynamic resistance and flow deceleration. Turbulence analysis revealed that MR1 concentrates Reynolds shear stress near the ground, while MR2 shifts turbulent activity upward due to its vertical distribution of vegetation. These findings emphasize the role of barrier structure in shaping airflow patterns and provide experimental data for validating numerical models. The results contribute to the design of more efficient windbreak strategies adapted to specific environmental goals, such as erosion control or dust dispersion mitigation. They shed new light on the influence of the upstream–downstream distribution of vegetation heights.
植物屏障通常用于降低风速，减轻粉尘扩散和风蚀。虽然它们的有效性已被广泛证明，但植物空间安排的影响，特别是在不同高度的多行配置中，仍未得到充分探索。本文采用单排树木和两种多排乔灌木组合（MR1：上游树木，下游灌木；MR2：上游灌木，下游树木）的人工植被模型对气流进行了风洞研究。基于二维激光多普勒测速，分析了流向(U)和垂直(V)分量以及雷诺数剪应力（\(\overline{u'v'}\)）对尾迹动力学的影响。结果表明，MR1（上游树木）在屏障附近引起了更强烈的速度降低，为28% of the downstream area exhibiting a reduction in the streamwise velocity greater than 60%, and the mean reduction of the streamwise velocity is 57%, indicating stronger near-surface sheltering. In contrast, MR2 (shrubs upstream) promotes a smoother and more extended velocity recovery profile, with a mean reduction of streamwise velocity of 46%, favoring long-range mitigation. Despite having similar porosity, the vertical distribution of solid elements in MR1 increases the effective frontal blockage, enhancing aerodynamic resistance and flow deceleration. Turbulence analysis revealed that MR1 concentrates Reynolds shear stress near the ground, while MR2 shifts turbulent activity upward due to its vertical distribution of vegetation. These findings emphasize the role of barrier structure in shaping airflow patterns and provide experimental data for validating numerical models. The results contribute to the design of more efficient windbreak strategies adapted to specific environmental goals, such as erosion control or dust dispersion mitigation. They shed new light on the influence of the upstream–downstream distribution of vegetation heights.
期刊介绍：
Experiments in Fluids examines the advancement, extension, and improvement of new techniques of flow measurement. The journal also publishes contributions that employ existing experimental techniques to gain an understanding of the underlying flow physics in the areas of turbulence, aerodynamics, hydrodynamics, convective heat transfer, combustion, turbomachinery, multi-phase flows, and chemical, biological and geological flows. In addition, readers will find papers that report on investigations combining experimental and analytical/numerical approaches.
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