干旱区生态环境知识资源中心(Arid): Morphological dynamics of a trough-shaped blowout on a fixed dune in China

Arid

DOI	10.1016/j.aeolia.2022.100830
	Morphological dynamics of a trough-shaped blowout on a fixed dune in China
	Zhou, Yanguang; Hasi, Eerdun; Yin, Jie; Wang, Zhuoran; Qing, Damuni; Hu, Rina; Wu, Zifeng
通讯作者	Hasi, E
来源期刊	AEOLIAN RESEARCH
ISSN	1875-9637
EISSN	2212-1684
出版年	2022
卷号	59
英文摘要	The formation and development of blowouts is an important surface indication of sand drift activity in semiarid grassland areas; thus, an accurate understanding of their morphological evolution characteristics and dynamic processes is of significance for grassland desertification control. This study analyzed the long-term topographic change of a trough blowout developed on a fixed sand dune in the Otindag sandy land of China via ground measurements from 2011 to 2020 and examined the short-term airflow structure through field observations. The results indicated that the area of the deflation basin shows a state of continuous growth. The expansion of the deflation basin was most obvious on the western, southwestern and southern slopes, which is contrary to the regional prevailing wind direction. As airflow passes over the blowout, there is significant airflow steering with the change in topography, and the degrees of airflow steering and acceleration are determined by the direction of the approaching wind. Airflow expands and decelerates on the leeward side of the deflation basin, causing flow separation and producing a recirculation zone on the sheltered lee slopes. Based on a detailed analysis of the results, we suggest that the soil collapse and sand avalanches caused by vortices are the main reasons for the upwind expansion of the deflation basin. Collectively, these findings reveal a strong link between the blowout morphology and the airflow pattern.
英文关键词	Trough blowout Morphology Wind direction Fixed dune
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000855096500001
WOS关键词	3-DIMENSIONAL AIR-FLOW ; BOWL BLOWOUT ; COASTAL ; PATTERNS ; ISLAND
WOS类目	Geography, Physical
WOS研究方向	Physical Geography
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/391561
推荐引用方式 GB/T 7714	Zhou, Yanguang,Hasi, Eerdun,Yin, Jie,et al. Morphological dynamics of a trough-shaped blowout on a fixed dune in China[J],2022,59.
APA	Zhou, Yanguang.,Hasi, Eerdun.,Yin, Jie.,Wang, Zhuoran.,Qing, Damuni.,...&Wu, Zifeng.(2022).Morphological dynamics of a trough-shaped blowout on a fixed dune in China.AEOLIAN RESEARCH,59.
MLA	Zhou, Yanguang,et al."Morphological dynamics of a trough-shaped blowout on a fixed dune in China".AEOLIAN RESEARCH 59(2022).