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    金子皓, 王京学, 任一凡, 张晓, 冀晓东. 不同林带结构的刺槐林防风效应[J]. 北京林业大学学报, 2022, 44(8): 39-47. DOI: 10.12171/j.1000-1522.20210550
    引用本文: 金子皓, 王京学, 任一凡, 张晓, 冀晓东. 不同林带结构的刺槐林防风效应[J]. 北京林业大学学报, 2022, 44(8): 39-47. DOI: 10.12171/j.1000-1522.20210550
    Jin Zihao, Wang Jingxue, Ren Yifan, Zhang Xiao, Ji Xiaodong. Windproof effect of Robinia pseudoacacia forest in different forest belts[J]. Journal of Beijing Forestry University, 2022, 44(8): 39-47. DOI: 10.12171/j.1000-1522.20210550
    Citation: Jin Zihao, Wang Jingxue, Ren Yifan, Zhang Xiao, Ji Xiaodong. Windproof effect of Robinia pseudoacacia forest in different forest belts[J]. Journal of Beijing Forestry University, 2022, 44(8): 39-47. DOI: 10.12171/j.1000-1522.20210550

    不同林带结构的刺槐林防风效应

    Windproof effect of Robinia pseudoacacia forest in different forest belts

    • 摘要:
        目的  刺槐是我国造林常用树种,在黄河入海口地带广泛种植,但该地区易遭受大风侵袭,刺槐由于根系浅容易发生风倒,因此通过合理的林带布置降低林内最大风速,避免林木倒伏,提升刺槐林的防风效应刻不容缓。
        方法  该研究以沿海刺槐防护林为研究对象,基于双向流固耦合技术利用Ansys Workbench平台建立风场与刺槐的计算模型,探讨不同林带结构刺槐林的防风效应。
        结果  (1)建立刺槐流固耦合仿真模型,经现场实测数据验证,模型水平归一化风速误差为13%,垂直归一化风速误差为6%,枝干风振位移相对稳定时误差为7 mm,模型具有较高的仿真精度。(2)模拟试验表明首行刺槐对风速减弱的效果明显,在固定行间距5 m的工况下每增加1行刺槐,风速对比前1行刺槐依次降低0.12 v_0 、0.07 v_0 、0.03 v_0 和0.01 v_0 v_0 为林前初始风速)。(3)相邻的两行刺槐随着行间距的增加,整体防风效果逐渐降低,风经过行间距分别为0.4H、0.5H、0.7H、1.0H和1.5H两行刺槐(H为刺槐树高),第2行风速分别比第1行减小0.15 v_0 、0.12 v_0 、0.07 v_0 、0.04 v_0 和0.01 v_0 。(4)交错排列的刺槐林防风效果优于方形排列,并且交错排列刺槐分枝的风振振幅更小。
        结论  不同的林带结构对刺槐林的防风效应会产生较大的影响,通过数值模拟技术对不同林带结构的防风效应进行评估是一种有效的研究手段,研究结果能够为该地区后续合理造林提供科学支持。

       

      Abstract:
        Objective  Robinia pseudoacacia is a common used tree species for afforestation in China, which is widely planted in the estuary of the Yellow River. However, the area is vulnerable to strong wind invasion, and Robinia pseudoacacia root is prone to windfall due to its shallow root system. Therefore, a reasonable forest belt layout is of great urgency to reduce the maximum wind speed in the forest, avoid tree collapse and improve the wind-proof effect of Robinia pseudoacacia forest.
        Method  The study focused on the coastal Robinia pseudoacacia shelter forest as the research object. The Ansys Workbench platform was used to establish the calculation model of the wind field and Robinia pseudoacacia based on the two-way fluid-structure coupling technology, so as to discuss the windproof effect of Robinia pseudoacacia forest in different forest belts.
        Result  (1) Establishing the two-way fluid-structure coupling simulation model of Robinia pseudoacacia and the flow field, verified by field test data, the horizontal normalized wind speed error of the model was 13%, and the vertical normalized wind speed error was 6%, and when the wind vibration of the branches was relatively stable, the displacement error was 7 mm, the model had high simulation precision. (2) The simulation results showed that the first row of Robinia pseudoacacia had an obvious effect on reducing the wind speed. Under the working condition of fixed row spacing of 5 m, the wind speed will decrease in turn as compared with the previous row of Robinia pseudoacacia by 0.12 v_0 , 0.07 v_0 , 0.03 v_0 and 0.01 v_0 ( v_0 was the initial wind speed before the forest). (3) With the increase of row spacing, the overall windproof effect of the two adjacent rows of Robinia pseudoacacia gradually decreased. After the wind passed through the two rows of Robinia pseudoacacia with row spacing of 0.4H, 0.5H, 0.7H, 1.0H and 1.5H, respectively (H is the height of the tree), the difference between the two reduced wind speeds of the two rows of Robinia pseudoacacia was 0.15 v_0 , 0.12 v_0 , 0.07 v_0 , 0.04 v_0 and 0.01 v_0 , respectively. (4) The windbreak effect of staggered Robinia pseudoacacia forests was better than square arrangement, and the wind vibration amplitude of staggered branches of Robinia pseudoacacia was smaller.
        Conclusion  Different forest belt structures have a great influence on the windproof effect of Robinia pseudoacacia forest, it is an effective research method to evaluate the windbreak effect of different forest belt structures by numerical simulation technology, the results can provide scientific support for subsequent reasonable afforestation in this area.

       

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