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Journal of Desert Research ›› 2020, Vol. 40 ›› Issue (3): 77-84.DOI: 10.7522/j.issn.1000-694X.2019.00066

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Wind tunnel test of wind speed reduction of Haloxylon anmodendron forests with different configuration

Li Jingwen1, Bao Yanfeng1, Guo Hao1, Liu Minghu2, Xin Zhiming2, Liu Pengfei1   

  1. 1. Institute of Desertification Studies, Chinese Academy of Forestry, Beijing 100091, China;
    2. Experimental Center of Desert Forestry, Chinese Academy of Forestry, Dengkou 015200, Inner Mongolia, China
  • Received:2019-06-13 Revised:2019-07-27 Online:2020-05-20 Published:2020-06-09

Abstract: Haloxylon anmodendron is an important sand-fixing shrub in the desert area. Its plant height and configuration are significantly different from those of trees. In order to explore the wind-proof effect of different configurations of H. ammodendron, this paper studied the wind speed flow field and wind-proof effect of different heights and densities of H. ammodendron model by wind tunnel simulation experiment under wind speed of 12 m·s-1. The results showed that there were significant differences in the velocity of the post-wind flow in the nine species of H. ammodendron. The wind speed of the H. ammodendron with a height of 1-2 cm was concentrated at 8-8.7 m·s-1 and the wind speed of the H. ammodendron with a height of 4 cm was concentrated at 7-8 m·s-1; The average wind protection performance of A3, B3 and C3 is 38.49%, 32.29% and 26.88%, respectively. The effective protection distance is 10H, 7.5H and 5H respectively, which is better than other configuration types. However, the wind speed of the forest belt with a height of 4cm and a row spacing of 2 cm×2 cm recovered rapidly, and the maximum wind speed was greater than that of the other two plant spacings. In the 1cm height of H. ammodendron, the wind-proof effect of the density of 2 cm×2 cm, indicating that the density advantage of the forest belt begins to decrease as the height of the H. ammodendron belt increases. Therefore, reasonable plant spacing can help the H. ammodendron belt to maximize its wind protection benefits.

Key words: Haloxylon anmodendron forests, wind tunnel test, configuration structure, windbreak efficiency

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