戈壁风沙流结构特性及其意义

doi:10.11867/j.issn.1001-8166.2005.01.0019

地球科学进展 ›› 2005, Vol. 20 ›› Issue (1): 19 -023. doi: 10.11867/j.issn.1001-8166.2005.01.0019

戈壁风沙流结构特性及其意义

屈建军 ¹，黄宁 ²，拓万全 ¹，雷加强 ³，董治宝 ¹，刘贤万 ¹，薛娴 ¹，俎瑞平1，张克存 ¹

中国科学院寒区旱区环境与工程研究所沙漠与沙漠化重点实验室，甘肃兰州 730000；兰州大学物理学院力学系，甘肃兰州 730000；中国科学院新疆生态与地理研

收稿日期:2003-11-11 修回日期:2004-05-01 出版日期:2005-01-25
通讯作者: 曲建军 E-mail:qujianj@lzb.ac.cn
基金资助:
国家重点基础研究发展规划项目“重大工程对风沙地貌发育过程的影响研究”(编号：G1999043505)；国家自然科学基金项目“库姆塔格沙漠羽毛状沙丘形成发育过程研究”(编号：49971013)资助.

Structural Characteristics of Gobi Sand-Drift and Its Significance

QU Jianjun ¹，HUANG Ning ²，TA Wanquan ¹，LEI Jiaqiang ³，DONG Zhibao ¹，LIU Xianwan ¹，XUE Xian ¹，ZU Ruiping ¹，ZHANG Kecun ¹

1.Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute,Lanzhou 730000,China;
2. Department of Mechanics, Physic College, Lanzhou University,Lanzhou 730000, China;
3. Xinjiang Ecology and Geography Research Institute, Chinese Academy of Sciences,Urumqi 830011, China

Received:2003-11-11 Revised:2004-05-01 Online:2005-01-25 Published:2005-01-25

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通过砾质戈壁风沙流野外实测数据的分析以及风洞模拟实验研究发现：戈壁风沙流结构具有与沙漠风沙流完全不同的风沙流特征，戈壁风沙地表的粗糙度随风速的增大而增加，其表面风沙流输沙量高度分布表现出独特的"象鼻"效应，在一定高度处呈现最大值，并随风速的增加而增高。该"象鼻"效应导致戈壁风沙流结构特征值λ远大于 1，不论风速多大，风沙流都处于未饱和状态的非堆积搬运状态。这种特殊性质比较清楚地解释了敦煌莫高窟千年来不被沙山埋没的谜底。并且在风沙防治工程实践中，采用砾石压沙措施，构造类似与砾质戈壁的下垫面，人工促使风沙流结构呈现"象鼻"形状，可使防沙工程达到理想的输导作用。

关键词: 戈壁, 风沙流结构, 输沙量高度分布, "象鼻"效应, 粒度高度分异, 风沙实验

By field measurement and wind tunnel simulation on sand-drift of Gobi, this paper draws the following conclusions: ① The wind-drift structure of Gobi has the feature which is different from that of mobile sand. The roughness of Gobi surface increases with wind velocity. With height increasing, the sand transport rate of Gobi surface takes on unique effect of elephant nose, that is, the sand transport rate comes to a maximum value in certain height and this height increasing with wind velocity. ② The elephant nose effect leads to the characteristic value of sand-drift in Gobi (λ)being more than 1 at all times. This indicates that the Gobi sand-drift is belonging to the unsaturated and non-accumulating state, however how great the wind velocity is. ③ The elephant nose effect of Gobi sand-drift can also answer the question why the Mogao Grottoes can not be buried by sands during more than 1000 years. ④ Therefore, in the practice of protecting sand damages, we can use gravels to cover mobile sand surface to form an underlying surface like Gobi, and making sands pass over it freely. 

Key words: Gobi, Sand-drift structure, Elephant nose effect, Grain size variation

中图分类号:

P512

[1]Zhu Zhenda, Wu Zheng，Liu Shu,et al. Overview of the Deserts in China [M].Beijing: Science Press,1980.[朱震达，吴正，刘恕，等.中国沙漠概论[M].北京：科学出版社，1980.]
[2]Wu Zheng. Aeolian Geomorphology[M].Beijing: Science Press,1987.[吴正.风沙地貌学[M].北京：科学出版社，1987.]
[3]Liu Dongsheng.Loess and Environment[M]. Beijing: Science Press,1985.[刘东生.黄土与环境[M].北京：科学出版社，1985.]
[4]Gillette D A,Fryrear D W,Jing B X,et al.Large-scale variability of wind erosion mass flux rates at Owens Lake[J].Journal of Geophysical Research,1997,102 (D22)：25 977-25 987.
[5]Bagnold R A. The Physics of Blown Sand and Desert Dunes[M]. London：Methuen,1941.
[6]Owen P R. Saltation of uniform grains in air[J].Journal of Fluid Mechanics,1964, 20: 225-242.
[7]Chepil W S. Dynamics of wind erosion: Nature of soil movement by wind[J].Soil Science,1945, 60: 305-320.
[8]Nickling W G.The stabilizing role of bonding agents on the entrainment of sediment by wind[J].Sedimentology,1984, 31: 111-117.
[9]Neuman M C，Nickling W G. Momentum extraction with saltation: Implications for experimental evaluation of wind profile parameters[J].BoundaryLayer Meteorology,1994,68: 35-50.
[10]Dong Zhibao, Qu Jianjun, Liu Xiaoping,et al. Experimental study of drag coefficient on Gobi surface[J].Science in China(D)，2000,31:11-17.[董治宝，屈建军，刘小平，等.戈壁表面阻力系数的实验研究[J].中国科学D辑，2000, 31:11-17.]
[11]Qu J J, Huang N, Dong G R,et al. The role and significance of the Gobi pavement in controlling sand movement on cliff top near the Dunhuang Mogao Grottoes[J].Journal of Arid Environments,2001,48: 357-371.

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