干旱区生态环境知识资源中心(Arid): Morphological characteristics and dynamic changes of seif dunes in the eastern margin of the Kumtagh Desert, China

Arid

	Morphological characteristics and dynamic changes of seif dunes in the eastern margin of the Kumtagh Desert, China
	Pang Yingjun; Wu Bo; Li Yonghua; Xie Shengbo
来源期刊	干旱区科学
ISSN	1674-6767
出版年	2020
卷号	12 期号:5
英文摘要	The seif dune field over the gravel desert surface in the eastern margin of the Kumtagh Desert is a valuable experimental site for the observation of dune formation and dynamics. We used high-resolution remote sensing and station observation approaches, combined with wind and grain size data, to study the characteristics of the aeolian environment and the morphologies of and dynamic changes in seif dunes. We observed the ratio of the resultant drift potential (RDP) to the drift potential (DP), which was 0.37, associated with an obtuse bimodal wind regime. The drift potentials in the west-northwest (WNW) and east-northeast (ENE) directions were dominant, and the angle between the two primary DP directions was 135.00°. The dune orientations ranged from 168.75°-213.75°, which were parallel to the resultant drift direction (186.15°). The dune lengths ranged from 51.68 to 1932.11 m with a mean value of 344.91 m. The spacings of the dunes ranged from 32.34 to 319.77 m with a mean value of 93.39 m. The mean grain size of the sediments became finer, and the sorting became better from upwind tail to downwind tip, which indicated that the sediment of the seif dunes in the study region may be transported from northward to southward. The rate of increase in the length, the mean longitudinal migration rate of the dune tail, and the mean longitudinal extension rate of the dune tip (also called elongation rate) were 4.93, 4.63, and 9.55 m/a, respectively. The mean lateral migration vector of the seif dunes was approximately 0.11 m/a towards the west (-0.11 m/a), while the mean amplitude of lateral migration was 0.53 m/a, ignoring the direction of lateral migration. We found that the seif dune field formed first beside seasonal rivers, which can provide sediment, and then expanded downwind.
英文关键词	seif dune Kumtagh Desert elongation migration drift potential
类型	Article
语种	英语
收录类别	CSCD
WOS类目	Geology
CSCD记录号	CSCD:6866306
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/353495
推荐引用方式 GB/T 7714	Pang Yingjun,Wu Bo,Li Yonghua,et al. Morphological characteristics and dynamic changes of seif dunes in the eastern margin of the Kumtagh Desert, China[J],2020,12(5).
APA	Pang Yingjun,Wu Bo,Li Yonghua,&Xie Shengbo.(2020).Morphological characteristics and dynamic changes of seif dunes in the eastern margin of the Kumtagh Desert, China.干旱区科学,12(5).
MLA	Pang Yingjun,et al."Morphological characteristics and dynamic changes of seif dunes in the eastern margin of the Kumtagh Desert, China".干旱区科学 12.5(2020).