A Numerical Study of the Effect of Vegetative Windbreak on Wind Erosion over Complex Terrain
A Numerical Study of the Effect of Vegetative Windbreak on Wind Erosion over Complex Terrain
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DOI：
10.3390/f13071072
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发表时间：
2022-07
期刊：
影响因子：
2.9
通讯作者：
Hao Li-;Z. Yan;Zhengmo Zhang;Jiachen Lang;Xudong Wang
中科院分区：
文献类型：
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作者：
Hao Li-;Z. Yan;Zhengmo Zhang;Jiachen Lang;Xudong Wang
风蚀是中国西北石窟石刻的典型问题，防风林等防风林已被证明可以有效地减轻风蚀。本研究的主要目的是探讨防护林对减轻石刻风蚀程度的效果。采用一种验证尺度，对基于可实现k-ε模型和大涡模拟模型的冠层模型再现空气动力效应的适用性进行了检验。对防护林结构进行了探讨，旨在寻求最佳林冠结构，为防护林设计提供依据。通过与大涡模拟模型的比较，考虑到模型的综合性能，采用了可实现的k-ε模型。结果表明，孔隙度φ = 30%，宽度0.3 ~ 0.5H的冠层具有较好的防护效果。与无防护林情况相比，风速放大系数降低了43%，且主要危害风向风速放大系数值显著降低，说明防护林的有效性。通过对历史石刻背景下的预防性保护技术的探索，可以促进文物科技保护的实践。
Wind erosion is a typical issue for stone carvings in northwest China caves, and windbreaks such as shelterbelts have proven to be effective in mitigating wind erosion. This study has the main purpose of examining the effect of shelterbelts on alleviating the wind erosion degree of stone carvings. The applicability of the canopy model for reproducing the aerodynamic effects based on the realizable k–ε and LES model was examined by using a validation metric. The shelterbelt structure has been discussed with the goal of finding the optimum canopy structure to provide a guideline for designing shelterbelts. Compared with the LES model, the realizable k–ε model was adopted in this study based on its comprehensive performance. The results show that a canopy with porosity of φ = 30% and a width of 0.3 to 0.5 H has better sheltering efficiency. Compared to the case with no shelterbelt, the wind speed amplification coefficient decreased by 43%, and the significant decrease in the value of the wind speed amplification coefficient in the primary-harm wind direction demonstrates the effectiveness of the shelterbelt. By exploring preventive protection technology in the context of historical stone carving, this study can promote the practice of scientific and technological protection of cultural relics.