Role of the crown in tree resistance against high winds

Hsin Huei Li, Yu Chuan Cheng, Kai Jie Yang, Chia Ren Chu, Tzay Ming Hong

研究成果: 雜誌貢獻期刊論文同行評審

摘要

Rather than using wooden sticks to simulate the breakage of trees in high winds as in most research, we employ fresh samples from camphor and Formosa gum with branches and leaves to certify the crucial role of the tree crown. By using a blowdown wind tunnel with a maximum wind speed of 50 m/s, we purposely reduce the number of leaves and show that the drag force will drop by as much as two thirds when half pruned. Based on real observations, we model the leaf by an open and full cone in the presence of light and strong winds, and calculate how their corresponding cross-sectional area A and drag force F vary with wind speed v. Different slopes before and after the formation of a full cone are predicted and confirmed when these two quantities are plotted in full-log scale. Compared to the empirical value, our simple model gave α=2/5 and 2/3 for Av-α and β=4/5 and 2/3 for Fvβ at low and high winds. Discrepancies can be accounted for by including further details, such as the reorientation of open cones and the movement of branches.

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文章編號025006
期刊Physical Review E - Statistical, Nonlinear, and Soft Matter Physics
104
發行號2
DOIs
出版狀態已出版 - 8月 2021

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