干旱区生态环境知识资源中心(Arid): 砾石级沙粒胶结体抗风蚀效益的实验研究

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	砾石级沙粒胶结体抗风蚀效益的实验研究
其他题名	Wind Tunnel Experiment on the Anti-erosion Benefits of Gravelsize Cemented Bodies from Inter-dune Corridors in the Hinterland of the Taklimakan Desert
	孙娜; 李生宇; 马学喜; 王海峰; 徐新文
来源期刊	中国沙漠
ISSN	1000-694X
出版年	2016
卷号	36 期号:3 页码:575-580
中文摘要	塔克拉玛干沙漠腹地部分垄间地表发育了一种由众多沙粒胶结而成的大颗粒物质,称为沙粒胶结体(sand cemented bodies,缩写为SCB),其直径达到粗沙级、极粗沙级和砾石级。为了研究其对地表风沙活动的影响,本研究以野外采集的砾石级沙粒胶结体(gravel-size sand cemented bodies,缩写为GSSCB)为实验材料,在净风和挟沙风条件下进行了GSSCB覆盖沙面的抗风蚀模拟实验。结果表明:床面的蚀积状态与来流条件、GSSCB覆盖度和风速均有关,净风时所有覆盖度床面均呈风蚀状态,挟沙风时随覆盖度和风速而变化,床面可呈3种状态风蚀、蚀积平衡、风积;在风蚀状态时,床面风蚀率随覆盖度增大以指数形式降低,随风速增大而以多种函数形式增加,抗风蚀效率随覆盖度增大而逐渐增加,但不同覆盖度范围增加率不同;挟沙风条件下呈蚀积平衡状态时的床面覆盖度临界Cb值与风速大小有关,随风速增加呈幂函数形式增加;在挟沙风条件下,覆盖度大于Cb值时床面呈风积状态,积沙率与风速的关系较为复杂,80%覆盖度床面积沙率随风速增大呈对数形式增加,但40%覆盖度床面积沙率则随风速增加呈指数形式降低。可见,由于与砾石的物理性质相近,GSSCB覆盖确实具有与砾石相类似的抗风蚀效益,并且在一定覆盖度条件下还能捕获风沙流挟沙颗粒。因此,塔克拉玛干沙漠腹地丘间地天然发育的GSSCB对于地表蚀积过程具有重要影响。GSSCB可作为一种新型固沙技术进行开发。
英文摘要	There are some larger granular materials whose diameter reach the level of coarse sand,very coarse sand and gravel,naturally distributed on some inter-dune corridors in the hinterland of the Taklimakan Desert. They were made up of a mass of sands which be cemented together by a certain substance,we call them sand cemented bodies(SCB).In order to research the effect of SCB on windblown sand movement,this study investigated the anti-wind erosion ability of the sand surface being covered with gravel-size sand cemented bodies(GSSCB)collected in the field by wind tunnel simulation in net-wind conditions and sand-driving wind conditions respectively.The results indicate that the conditions of erosion-deposition on sand surface depended on the inflow conditions,wind speeds and degrees of GSSCB coverage.All sand beds in all GSSCB coverage treatments showed an erosion status under net-wind condition.But there were three conditions of erosion, erosion-deposition balance and deposition under sand-driving wind conditions,the conditions varied with the degree of GSSCB coverage and wind speed.When the sand beds were in a condition of erosion,the erosion rates decreased exponentially with the increasing degree of GSSCB coverage and increased in forms of different functions with the increasing wind speed.As the coverage rise,the anti-wind erosion rates gradually increased,but the increased ratios were different in different ranges of GSSCB coverage.When the sand bed showed in a condition of erosion-deposition balance under a sand-driving wind condition,its degree of GSSCB coverage reached a critical value Cbin that environment.The value of Cbincreased with the increasing speed,whose relationship could be described as a power function.When the coverage was greater than Cb,the sand bed showed a sand deposition status;however,the relation between the sand deposition rates and wind speeds was complex.The sand deposition rates increased as a logarithm function at the coverage of 80%and decreased as an exponent form at the coverage of 40% with the raising wind speed under the sanddriving wind condition.As a result,for the similar physical natures like gravel,the GSSCB coverage does have an anti-erosion benefits for the sand surface,GSSCB can also capture windblown sand from wind-sand flow at a given coverage.So we should pay attention to the effect of GSSCB on the windblown sand movement in the hinterland of the Taklimakan Desert in future aeolian research.A new type of sand fixation technology can be developed soon inspired by GSSCB.
中文关键词	砾石级沙粒胶结体 ; 覆盖度 ; 风蚀率 ; 抗风蚀效率
英文关键词	gravel-size sand cemented bodies coverage wind erosion rate anti-erosion efficiency
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOSCIENCES MULTIDISCIPLINARY
WOS研究方向	Geology
CSCD记录号	CSCD:5743614
来源机构	中国科学院新疆生态与地理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/235404
作者单位	中国科学院新疆生态与地理研究所, 乌鲁木齐, 新疆 830011, 中国
推荐引用方式 GB/T 7714	孙娜,李生宇,马学喜,等. 砾石级沙粒胶结体抗风蚀效益的实验研究[J]. 中国科学院新疆生态与地理研究所,2016,36(3):575-580.
APA	孙娜,李生宇,马学喜,王海峰,&徐新文.(2016).砾石级沙粒胶结体抗风蚀效益的实验研究.中国沙漠,36(3),575-580.
MLA	孙娜,et al."砾石级沙粒胶结体抗风蚀效益的实验研究".中国沙漠 36.3(2016):575-580.