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	风向对半固定沙垄表面风速影响----以古尔班通古特沙漠为例
其他题名	Airflow Velocity over Semi-fixed Longitudinal Dune in Different Wind Directions A case study of Gurbantunggut Desert
	郭洪旭; 王雪芹; 盖世广; 吴涛; 胡永锋
来源期刊	中国沙漠
ISSN	1000-694X
出版年	2010
卷号	30 期号:5 页码:1019-1026
中文摘要	利用DETI 可移动测风系统对古尔班通古特沙漠半固定沙垄表面风速进行实地观测,获取了主要风季不同风向条件下沙垄表面7 个典型部位距离地表20cm、40cm、60cm、100cm和200cm 5 个高度的风速系列数据,系统研究风向对半固定沙垄表面坡面风速及风速廓线的影响. 结果表明,迎风坡的气流加速和背风坡的风速降低现象在实际观测中得到证实,但受风向的影响甚大. 垄顶风速放大率随入射角的增大呈指数关系递增,而背风坡风速占垄顶风速的比率则随入射角的增大呈线性关系递减. 大角度入射气流速度变化主要受控于沙垄形态,小角度入射气流速度变化主要受控于地表植被状况. 无论气流以何种角度入射,距沙垄表面20cm高度气流的加速均较其他高度缓和. 沙垄底部和坡中下部的风速廓线变化趋势基本一致,且呈较好的对数拟合关系;两坡中上部和垄顶部的对数拟合方程相关系数偏小;受回旋涡流的影响,风速廓线在背风坡上部有明显偏折,初步断定涡流中心在距地表40cm左右的高度
英文摘要	Field measurement of airflow velocity under different wind directions at five heights0.2m 0.4 m, 0.6m, 1m and 2m over semi-fixed longitudinal dune was made in Gurbantunggut Desert. It was found that the airflow velocity increased over the windward slope and decreased over the lee slope and both processes were deeply affected by wind direction. There exists a strong linear relationship between wind velocity and wind incidence angle. The magnification of wind velocity over the dune crest rises up with the incidence angles increase while the proportions of wind velocity at2m high over lee slope to wind velocity at 2m high over the dune crest reduce with the incidence angle’s increase. The variation of airflow velocity was mainly controlled by the shape of dune when incidence angles were big and that is mainly controlled by character of vegetation when incidence angles were small. No matter what direction the airflow come from the variation amplitude of airflow velocity at0.2m high over dune surface was smaller than that at the other 4 heights. The wind speed profile in inter-dune was same with that over lower slope and both of them have a strong logarithm relationship with height while the relationship does not exist over the upper slope and the dune crest. According to the wind speed profile over the upper of lee slope a primarily conclusion is drew that the center of the whirlpool is at 0.4 m high from the sand surface
中文关键词	风向 ; 半固定沙垄 ; 风速 ; 古尔班通古特沙漠
英文关键词	wind direction semi-fixed longitudinal dune airflow velocity Gurbantunggut Desert
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:3981723
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/2XILL650/226019
作者单位	新疆生态与地理研究所, 中国科学院生物地理与生物资源重点实验室, 乌鲁木齐, 新疆 830011, 中国
推荐引用方式 GB/T 7714	郭洪旭,王雪芹,盖世广,等. 风向对半固定沙垄表面风速影响----以古尔班通古特沙漠为例[J]. 中国科学院新疆生态与地理研究所,2010,30(5):1019-1026.
APA	郭洪旭,王雪芹,盖世广,吴涛,&胡永锋.(2010).风向对半固定沙垄表面风速影响----以古尔班通古特沙漠为例.中国沙漠,30(5),1019-1026.
MLA	郭洪旭,et al."风向对半固定沙垄表面风速影响----以古尔班通古特沙漠为例".中国沙漠 30.5(2010):1019-1026.