Aerodynamic Properties and Shelter Effects of a Concrete Plate-Insert Sand Fence Along the Lanzhou-Xinjiang High-Speed Railway in Gobi Regions Under Strong Winds
Aerodynamic Properties and Shelter Effects of a Concrete Plate-Insert Sand Fence Along the Lanzhou-Xinjiang High-Speed Railway in Gobi Regions Under Strong Winds
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兰新高铁戈壁地区混凝土插板沙栅强风下气动特性及遮挡效果
DOI：
10.3389/fenvs.2022.861063
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发表时间：
2022-05
影响因子：
4.6
通讯作者：
Baicheng Niu
中科院分区：
文献类型：
--
作者：
Tao Wang;Jianjun Qu;Qinghe Niu;Zhishan An;Yang Gao;Hongtao Wang;Baicheng Niu
兰新高铁穿越戈壁沙漠大风区，风沙灾害严重威胁铁路运营安全。为防止道床积沙，在线路迎风面设置了由混凝土柱和板组成的双排拦沙栅。然而，这些栅栏的空气动力学特性和遮蔽效果仍不清楚。在这项研究中，沙栅栏的边界风模式和输沙的影响进行了调查，在现场和风洞。结果表明：1）第一排和第二排栅栏背风侧的风速降低率分别为78%和87%;然而，由于栅栏上的大开口，背风侧的第一和第二排栅栏的拦沙效率分别仅为72%和63%。2)栅栏的有效遮蔽距离（Ds）是栅栏高度的10倍;然而，两排栅栏之间的水平距离远大于栅栏的Ds。这使得栅栏之间的风速再次上升到跃变阈值以上，从而降低了双排栅栏的整体遮蔽效果。该研究为戈壁大风区风沙控制系统的设计和安装提供了理论参考。
The Lanzhou-Xinjiang High-Speed Railway runs through high-wind areas in the Gobi Desert, and disasters arising from the effects of blown sand critically endanger the safety of railway operations. To prevent sand deposition on the rail bed, double rows of sand fences composed of concrete columns and plates are installed on the windward side of the railway line. However, the aerodynamic properties and sheltering effects of these fences remain unclear. In this study, the effects of sand fences on boundary wind patterns and sand transport were investigated in the field and in a wind tunnel. The following results were obtained: 1) The wind velocity was efficiently reduced on the leeward side of the first and second rows of fences by 78% and 87%, respectively. Nevertheless, owing to large openings in the fence, the sand-trapping efficiencies of the first and second rows of fences on the leeward sides were only 72 and 63%, respectively. 2) The effective shelter distance ( D s ) of the fence is 10 times the height of the fence; however, the horizontal distance between the two rows of fences is much larger than the D s of the fence. This allows the wind velocity between the fences to rise above the saltation threshold once again, thereby reducing the overall sheltering effects of the double-row of fences. This study will produce a theoretical reference for improving the design and installation of blown-sand control systems in the strong-wind regions of the Gobi.
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影响因子：
3.3
作者：
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影响因子：
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影响因子：
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