干旱区生态环境知识资源中心(Arid): Effect of the W-beam central guardrails on wind-blown sand deposition on desert expressways in sandy regions

Arid

	Effect of the W-beam central guardrails on wind-blown sand deposition on desert expressways in sandy regions
	Wang Cui; Li Shengyu; Lei Jiaqiang; Li Zhinong; Chen Jie
来源期刊	Journal of Arid Land
ISSN	1674-6767
出版年	2020
卷号	12 期号:1 页码:154-165
英文摘要	Many desert expressways are affected by the deposition of the wind-blown sand, which might block the movement of vehicles or cause accidents. W-beam central guardrails, which are used to improve the safety of desert expressways, are thought to influence the deposition of the wind-blown sand, but this has yet not to be studied adequately. To address this issue, we conducted a wind tunnel test to simulate and explore how the W-beam central guardrails affect the airflow, the wind-blown sand flux and the deposition of the wind-blown sand on desert expressways in sandy regions. The subgrade model is 3.5 cm high and 80.0 cm wide, with a bank slope ratio of 1:3. The W-beam central guardrails model is 3.7 cm high, which included a 1.4-cm-high W-beam and a 2.3-cm-high stand column. The wind velocity was measured by using pitot-static tubes placed at nine different heights (1, 2, 3, 5, 7, 10, 15, 30 and 50 cm) above the floor of the chamber. The vertical distribution of the wind-blown sand flux in the wind tunnel was measured by using the sand sampler, which was sectioned into 20 intervals. In addition, we measured the wind-blown sand flux in the field at K50 of the Bachu-Shache desert expressway in the Taklimakan Desert on 11 May 2016, by using a customized 78-cm-high gradient sand sampler for the sand flux structure test. Obstruction by the subgrade leads to the formation of two weak wind zones located at the foot of the windward slope and at the leeward slope of the subgrade, and the wind velocity on the leeward side weakens significantly. The W-beam central guardrails decrease the leeward wind velocity, whereas the velocity increases through the bottom gaps and over the top of the W-beam central guardrails. The vertical distribution of the wind-blown sand flux measured by wind tunnel follows neither a power-law nor an exponential function when affected by either the subgrade or the W-beam central guardrails. At 0.0H and 0.5H (where H=3.5 cm, which is the height of the subgrade), the sand transport is less at the 3 cm height from the subgrade surface than at the 1 and 5 cm heights as a result of obstruction by the W-beam central guardrails, and the maximum sand transportation occurs at the 5 cm height affected by the subgrade surface. The average saltation height in the presence of the W-beam central guardrails is greater than the subgrade height. The field test shows that the sand deposits on the overtaking lane leeward of the W-beam central guardrails and that the thickness of the deposited sand is determined by the difference in the sand mass transported between the inlet and outlet points, which is consistent with the position of the minimum wind velocity in the wind tunnel test. The results of this study could help us to understand the hazards of the wind-blown sand onto subgrade with the W-beam central guardrails.
英文关键词	wind velocity field wind-blown sand flux W-beam central guardrails sand deposition desert expressway wind tunnel test Taklimakan Desert
类型	Article
语种	英语
开放获取类型	Bronze
收录类别	CSCD
WOS研究方向	Transportation
CSCD记录号	CSCD:6663127
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/336255
作者单位	Wang Cui, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences;;College of Resource and Environment Sciences, Xinjiang University;;Xinjiang Academy of Transportation Sciences;;University of Chinese Academy of Sciences, ;;;;;;, Urumqi;;Urumqi;;Urumqi;;, ;;;;;;Beijing 830011;;830046;;830000;;100049.; Li Shengyu, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China.; Lei Jiaqiang, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China.; Li Zhinong, Xinjiang Academy of Transportation Sciences, Urumqi, Xinjiang 830000, China.; Chen Jie, Xinjiang Academy of Transportation Sciences, Urumqi, Xinjiang 830000, China.
推荐引用方式 GB/T 7714	Wang Cui,Li Shengyu,Lei Jiaqiang,et al. Effect of the W-beam central guardrails on wind-blown sand deposition on desert expressways in sandy regions[J],2020,12(1):154-165.
APA	Wang Cui,Li Shengyu,Lei Jiaqiang,Li Zhinong,&Chen Jie.(2020).Effect of the W-beam central guardrails on wind-blown sand deposition on desert expressways in sandy regions.Journal of Arid Land,12(1),154-165.
MLA	Wang Cui,et al."Effect of the W-beam central guardrails on wind-blown sand deposition on desert expressways in sandy regions".Journal of Arid Land 12.1(2020):154-165.