| 青藏铁路沿线砾石方格固沙机理风洞模拟研究 |
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| 引用本文： | 张克存,屈建军,牛清河,张伟民,韩庆杰.青藏铁路沿线砾石方格固沙机理风洞模拟研究[J].地球科学进展,2010,25(3):284-289. |
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| 作者姓名： | 张克存 屈建军 牛清河 张伟民 韩庆杰 |
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| 作者单位： | 中国科学院寒区旱区环境与工程研究所敦煌戈壁荒漠生态与环境研究站沙漠与沙漠化重点实验室,甘肃,兰州,730000 |
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| 基金项目： | 国家自然科学基金项目“高原低气压风沙运动特征与青藏铁路路基沙害形成机理”(编号:40701171)资助 |
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| 摘 要： | 通过对青藏铁路沿线砾石方格内风速特征、固沙效率的风洞模拟实验研究发现,当气流运行至砾石方格前缘,水平风速迅速降低,砾石方格对风速的削弱作用非常显著,达到50%左右。气流在沿砾石方格向下风向移动过程中,水平梯度风速逐渐减小,但其减小幅度比较缓慢。砾石方格中风速随高度的分布遵循对数规律,各方格间风速变化趋势相对稳定。砾石方格地表粗糙度在5.2cm左右,摩阻速度为2.4 cm/s。砾石方格中固沙量随着进口风速的增加而增加,在相同风速下,固沙量随离沙源距离的增加呈指数关系递减。
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| 关 键 词： | 青藏铁路 砾石方格 风速廓线 固沙机理 |
Simulative Research on the Mechanism of Rocky Checkerboard Sand Barriers along Qinghai-Tibet Railway in Wind Tunnel |
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| ZHANG Kecun,QU Jianjun,NIU Qinghe,ZHANG Weimin,HAN Qingjie.Simulative Research on the Mechanism of Rocky Checkerboard Sand Barriers along Qinghai-Tibet Railway in Wind Tunnel[J].Advance in Earth Sciences,2010,25(3):284-289. |
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| Authors: | ZHANG Kecun QU Jianjun NIU Qinghe ZHANG Weimin HAN Qingjie |
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| Institution: | Dunhuang Gobi and Desert Ecology and Environment Research Station, Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou730000, China |
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| Abstract: | Based on the simulative research on the characteristics of wind speed,sand-fixed rate of rocky checkerboard sand barriers along Qinghai-Tibet Railway in wind tunnel,several conclusions were drawn as follows.Horizontal wind speed rapidly decreases when it flows to the fringe of rocky checkerboard sand barriers.Weaken efficiency of rocky checkerboard sand barrier on airflow is distinct,with about 50%.Wind speed changes little over rocky checkerboard sand barrier.In contrast,although the wind speed decreases f... |
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| Keywords: | Qinghai-Railway Rocky checkerboard sand barrier Wind profile Sand-fixing mechanism |
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