气候变化领域集成服务门户(CCPortal): From dome dune to barchan dune: Airflow structure changes measured with particle image velocimetry in a wind tunnel

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DOI	10.1016/j.geomorph.2021.107681
	From dome dune to barchan dune: Airflow structure changes measured with particle image velocimetry in a wind tunnel
	Qian, Guangqiang; Yang, Zhuanling; Tian, Min; Dong, Zhibao; Liang, Aimin; Xing, Xuegang
通讯作者	Qian, GQ (通讯作者)，Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Desert & Desertificat, 322 West Donggang Rd, Lanzhou 730000, Gansu, Peoples R China.
发表日期	2021
ISSN	0169-555X
EISSN	1872-695X
卷号	382
英文摘要	The evolution from the initial sand accumulation to a mature barchan dune can be divided into five general stages. The first two stages are transient sand patches that disperse easily during downwind movement of the dune. In this study, we focused on the flow field changes around the dunes during the last three stages of dune evolution, namely the dome, protobarchan, and mature barchan stages. By means of particle image velocimetry, we measured the mean and turbulent flow fields around 3D-printed scale models of real dunes in a wind tunnel and discuss the significance of the airflow variation for dune evolution. We found that topographic forcing plays an important role in the changes of the mean and turbulent airflow structures. The airflow patterns on the windward slope were similar at all three stages, with deceleration at the windward toe and horizontal acceleration combined with vertical upward movement of the airflow along the windward slope. On the leeward sides of the dune during the three stages, the airflow structure evolved from airflow diffusion to airflow diffusion accompanied by transient flow separation, and then to complete airflow separation and reattachment. The turbulence intensity near the dune surface increased significantly as the dune matured and two zones with a high Reynolds shear stress appeared: in the middle of the windward slope and in the lee of the dune. Based on our results, we discuss the impact of changes in the airflow structure at different evolutionary stages on the evolution of dune morphology. ? 2021 Elsevier B.V. All rights reserved.
英文关键词	Dome dune; Barchan dune; Morphodynamics; Turbulent flow
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000640374900002
来源期刊	GEOMORPHOLOGY
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/253729
作者单位	[Qian, Guangqiang; Tian, Min; Xing, Xuegang] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Desert & Desertificat, 322 West Donggang Rd, Lanzhou 730000, Gansu, Peoples R China; [Yang, Zhuanling] Guizhou Educ Univ, Sch Geog & Resources, Guiyang, Peoples R China; [Dong, Zhibao; Liang, Aimin] Shaanxi Normal Univ, Sch Geog & Tourism, Xian, Peoples R China
推荐引用方式 GB/T 7714	Qian, Guangqiang,Yang, Zhuanling,Tian, Min,et al. From dome dune to barchan dune: Airflow structure changes measured with particle image velocimetry in a wind tunnel[J]. 中国科学院西北生态环境资源研究院,2021,382.
APA	Qian, Guangqiang,Yang, Zhuanling,Tian, Min,Dong, Zhibao,Liang, Aimin,&Xing, Xuegang.(2021).From dome dune to barchan dune: Airflow structure changes measured with particle image velocimetry in a wind tunnel.GEOMORPHOLOGY,382.
MLA	Qian, Guangqiang,et al."From dome dune to barchan dune: Airflow structure changes measured with particle image velocimetry in a wind tunnel".GEOMORPHOLOGY 382(2021).