气候变化领域集成服务门户(CCPortal): Wind tunnel test on the effect of metal net fences on sand flux in a Gobi Desert, China

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DOI	10.1007/s40333-017-0068-5
	Wind tunnel test on the effect of metal net fences on sand flux in a Gobi Desert, China
	Wang Tao; Qu Jianjun; Ling Yuquan; Xie Shengbo; Xiao Jianhua
发表日期	2017
ISSN	1674-6767
EISSN	2194-7783
卷号	9 期号:6
英文摘要	The Lanzhou-Xinjiang High-speed Railway runs through an expansive windy area in a Gobi Desert, and sand-blocking fences were built to protect the railway from destruction by wind-blown sand. However, the shielding effect of the sand-blocking fence is below the expectation. In this study, effects of metal net fences with porosities of 0.5 and 0.7 were tested in a wind tunnel to determine the effectiveness of the employed two kinds of fences in reducing wind velocity and restraining wind-blown sand. Specifically, the horizontal wind velocities and sediment flux densities above the gravel surface were measured under different free-stream wind velocities for the following conditions: no fence at all, single fence with a porosity of 0.5, single fence with a porosity of 0.7, double fences with a porosity of 0.5, and double fences with a porosity of 0.7. Experimental results showed that the horizontal wind velocity was more significantly decreased by the fence with a porosity of 0.5, especially for the double fences. The horizontal wind velocity decreased approximately 65% at a distance of 3.25 m ( i.e., 13H, where H denotes the fence height) downwind the double fences, and no reverse flow or vortex was observed on the leeward side. The sediment flux density decreased exponentially with height above the gravel surface downwind in all tested fences. The reduction percentage of total sediment flux density was higher for the fence with a porosity of 0.5 than for the fence with a porosity of 0.7, especially for the double fences. Furthermore, the decreasing percentage of total sediment flux density decreased with increasing free-stream wind velocity. The results suggest that compared with metal net fence with a porosity of 0.7, the metal net fence with a porosity of 0.5 is more effective for controlling wind-blown sand in the expansive windy area where the Lanzhou-Xinjiang High-speed Railway runs through.
关键词	wind-blown sand wind tunnel experiment porous fence flow field sediment flux density Lanzhou-Xinjiang High-speed Railway Gobi Desert
学科领域	Environmental Sciences & Ecology
语种	英语
WOS研究方向	Environmental Sciences
来源期刊	JOURNAL OF ARID LAND
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/111894
作者单位	Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Desert & Desertificat, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Wang Tao,Qu Jianjun,Ling Yuquan,et al. Wind tunnel test on the effect of metal net fences on sand flux in a Gobi Desert, China[J]. 中国科学院西北生态环境资源研究院,2017,9(6).
APA	Wang Tao,Qu Jianjun,Ling Yuquan,Xie Shengbo,&Xiao Jianhua.(2017).Wind tunnel test on the effect of metal net fences on sand flux in a Gobi Desert, China.JOURNAL OF ARID LAND,9(6).
MLA	Wang Tao,et al."Wind tunnel test on the effect of metal net fences on sand flux in a Gobi Desert, China".JOURNAL OF ARID LAND 9.6(2017).