干旱区生态环境知识资源中心(Arid): 砂粒胶结体盖度与床面风沙活动关系的风洞模拟

Arid

	砂粒胶结体盖度与床面风沙活动关系的风洞模拟
其他题名	Wind Tunnel Simulation on the Relationship between Coverage of Sand-cemented Bodies and Sand-drift Activity
	周杰 1; 李生宇2 ; 王海峰 2; 刘志辉 3; 孙娜 2
来源期刊	干旱区研究
ISSN	1001-4675
出版年	2016
卷号	33 期号:4 页码:892-897
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砂粒胶结而成的大颗粒物质,称为砂粒胶结体(sand cemented bodies,缩写为SCD),其直径达到粗砂级、极粗砂级和砾石级。为研究其对地表风沙活动的影响,以野外采集SCD颗粒为实验材料,对不同SCD盖度下输沙通量垂直分布及输沙率变化进行了风洞实验。结果表明: 风沙通量在SCD盖度沙床面表现为指数变化,主要集中在风沙活动底部。同时,随着SCD盖度的增加,总输沙量降低,部分沙量运移到较高层面,输沙率随SCD盖度变化可分成3个梯度区域,且曲线斜率反映不同风速等级下,SCD盖度对地表沙物质沉积过程的影响。当SCD盖度小于10% 时,风沙活动强烈且风速在输沙过程中起主导作用。当SCD盖度在10% ~ 40%时,随着SCD盖度增加输沙率降低,盖度对地表风沙活动的影响更为明显,特别是对近地表风沙活动的影响。当SCD盖度大于40%时,床面风沙活动趋于稳定,输沙率变化微弱,随SCD盖度变化输沙率保持不变,沙床面不易受侵蚀。因此,砂粒胶结体覆盖沙床面能够有效降低地表风蚀,且在一定盖度下还能捕获流沙颗粒。塔克拉玛干沙漠腹地丘间地天然发育的SCD对于地表风蚀过程具有重要的影响,可作为一种新型固沙材料进行开发。
英文摘要	Sand-cemented bodies (SCD) are similar with gravel in density and volume and continually distributed as a special large-granular layer covering on sand surface in the hinterland of the Taklimakan Desert. In order to research the effect of SCD on windblown sand movement,in this study the sand transport rate related to SCD coverage and wind velocity was investigated through wind tunnel simulation. Result showed that the flux of sand transport rate above SCD-covered sand surface could be expressed by an exponential equation,and the influence of SCD coverage on sand transport rate was mainly at the bottom of windblown sand cloud. Moreover,with the increase of SCD coverage,the total sand transport was dropped,and more proportion of sand moved to higher layer. The total sand transport rate varying with SCD coverage could be divided into three gradient zones,and the slope of curve reflected the different influences of SCD with different coverage. When the SCD coverage varied from 10% to 40%,the sand transport was dropped quickly,especially at the bottom of windblown sand cloud. When the SCD coverage was less than 10%,the increase of sand transport rate was mainly induced by the increase of wind velocity. In a word,the SCD coverage does has an anti-erosion benefit for sand surface,it also can capture windblown sand,and SCD might be developed as a new type of sand fixation technology.
中文关键词	风沙活动 ; 砂粒胶结体 ; 覆盖度 ; 输沙通量 ; 输沙率 ; 塔克拉玛干沙漠
英文关键词	sand-drift activity sand-cemented body coverage sand flux sand transport rate Taklimakan Desert
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURAL ENGINEERING
WOS研究方向	Agriculture
CSCD记录号	CSCD:5759475
来源机构	中国科学院新疆生态与地理研究所 ; 新疆大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/234318
作者单位	1.中国科学院新疆生态与地理研究所, 新疆策勒荒漠草地生态系统国家野外科学观测试验站, 乌鲁木齐, 新疆 830011, 中国; 2.中国科学院新疆生态与地理研究所, 乌鲁木齐, 新疆 830011, 中国; 3.新疆大学资源与环境学院, 乌鲁木齐, 新疆 830046, 中国
推荐引用方式 GB/T 7714	周杰,李生宇,王海峰,等. 砂粒胶结体盖度与床面风沙活动关系的风洞模拟[J]. 中国科学院新疆生态与地理研究所, 新疆大学,2016,33(4):892-897.
APA	周杰,李生宇,王海峰,刘志辉,&孙娜.(2016).砂粒胶结体盖度与床面风沙活动关系的风洞模拟.干旱区研究,33(4),892-897.
MLA	周杰,et al."砂粒胶结体盖度与床面风沙活动关系的风洞模拟".干旱区研究 33.4(2016):892-897.