干旱区生态环境知识资源中心(Arid): 古尔班通古特沙漠腹地半固定沙垄顶部风沙运动规律

Arid

	古尔班通古特沙漠腹地半固定沙垄顶部风沙运动规律
其他题名	Windblown sand movement on the top of semi-fixed longitudinal dune in the hinterland of Gurbantunggut Desert
	郭洪旭; 王雪芹; 盖世广; 吴涛; 胡永锋
来源期刊	干旱区地理
ISSN	1000-6060
出版年	2010
卷号	33 期号:6 页码:954-961
中文摘要	利用DETI可移动测风系统, 结合多向集沙、阶梯式积沙和总体沙面活动强度观测, 系统研究了古尔班通古特沙漠腹地半固定沙垄表面风沙运动规律. 结果表明: 沙漠腹地沙垄两坡和垄间多被植被与生物结皮覆盖, 地表处于稳定状态, 地表输沙主要集中于垄顶部至两坡上部. 系统性天气条件下, 气流以净风状态在迎风坡持续加速, 至垄顶迎风侧边缘流速增至最大并开始起沙, 风沙流越过垄顶后受植被阻挡和回旋涡流的双重影响, 在垄顶背风侧上部急剧减速并发生沙物质沉积, 此后气流速度又逐渐恢复. 起沙风由沙垄两侧交替入射, 不断将沙物质从垄顶一侧搬运到另一侧. 流动带两侧沙面活动剧烈, 流动带中部作为过沙床面, 蚀积变化低于两侧. 垄顶输沙量沿垂线方向呈指数分布, 输沙率、各高度层输沙量以及沙物质输移高度都随着风速的增大而增大. 垄顶部距地表6 cm和10 cm以内的输沙量分别占总输沙量的80％和90％. 垄顶输沙势与实测输沙量之间具有良好的相关性, 初步推测1VU的输沙风能在垄顶1 m的过沙宽度上可以产生25 kg的输沙
英文摘要	Field measurement of airflow velocity over semi-fixed longitudinal dune surface was made in the hinterland of Gurbantunggut Desert, meantime two types of sand traps were used to carry out the sand transport in order to understand the characteristics of blown sand movement on this type of dune. The results show that the blown sand activity mainly occurs on the top of longitudinal dune, while that in the interdune and lower slopes were not observed because of the protection of vegetation and crust cover over there. The airflow velocity increases from toe to top of the dune and reaches to maximum at the edge of mobile strip, and it begin to translate into the ground sands. The blown sands deposit in the upside of lee slope for vegetation block and present of whirlpool. When wind blows from two sides of the dune crest, the drift sands are moved from one side to another alternately. The erosion and deposition depth at the edge of the top is stronger than that of the middle area of the top. There exists a well relationship between the sand transport rate and height. About 80% and 90% of blown sand quantity are mainly transported through a vertical profile with 0 to 6 cm and 0 to 10 cm height. The proportion of moving sand in the higher layer increases with wind velocity. A strong relationship exists between the value of drift potential and quantity of mass flux on the top of the dune. The paper predicates that the wind energy of 1 VU can make 25 kg mass flux pass through a vertical profile with 1 m width at the top of the longitudinal dune in the hinterland of the Gurbantunggut Desert
中文关键词	半固定沙垄 ; 蚀积变化 ; 输沙率 ; 输沙势 ; 古尔班通古特沙漠
英文关键词	semi-fixed longitudinal dune sand surface change sand transport rate drift potential 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:4103248
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/2XILL650/225036
作者单位	中国科学院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. 古尔班通古特沙漠腹地半固定沙垄顶部风沙运动规律[J]. 中国科学院新疆生态与地理研究所,2010,33(6):954-961.
APA	郭洪旭,王雪芹,盖世广,吴涛,&胡永锋.(2010).古尔班通古特沙漠腹地半固定沙垄顶部风沙运动规律.干旱区地理,33(6),954-961.
MLA	郭洪旭,et al."古尔班通古特沙漠腹地半固定沙垄顶部风沙运动规律".干旱区地理 33.6(2010):954-961.