Evaluation of the effect of planting pattern on evergreen species as windbreaks

خدایاری, ندا and حامی, احمد and فرخی, نوید Evaluation of the effect of planting pattern on evergreen species as windbreaks. In: 2nd International and 6th National Iranian Congress on Organic vs. Conventional Agriculture, August 2019, Ardabil, Iran.

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Abstract

The most important factor in urban areas and urban open spaces is climate. Wind as an atmospheric element has some annoying aspects, therefore, controlling it and reducing its speed is one of the most important matters, which should be examined in landscape engineering.The most efficient factors that can be effective on aerodynamic features of windbreaks are height of trees (H), crown shape, width, arrangement (number of rows and ordering), density, and porosity, etc.The computational fluid dynamics is used to simulate airflow through the trees as 3D forms.The Computational fluid dynamics (CFD) is utilized to investigate the flow characteristics around tree windbreaks.Thuja orientalisis chosen as a typical tree with pyramidal crown shape.According to the results, the best reduction is observed for the heights above 1 meters with 0.50 m gap distance between trees. The results also reveal that triangular two-row arrangement of trees with pyramidal forms is more effective than the other arrangements in reducing wind velocity.The average wind speed decrease at the 0.50 m gap between trees at two-row triangular planting is 2.41 m / s, while the corresponding values for rectangular and single-row row planting are 2.63 and 2.54 m/s, respectively.

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