The encountering dune fields in a bidirectional flow system in the northwestern South China Sea: Pattern, morphology, and recent dynamics

doi:10.1016/j.geomorph.2022.108210

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋环流与波动重点实验室

	The encountering dune fields in a bidirectional flow system in the northwestern South China Sea: Pattern, morphology, and recent dynamics
	Li, Jinyuan 1,2; Yan, Jun 3,4,5; Feng, Xingru 3,6; Song, Yongdong 3,4; Xu, Tao 3,4; Zhuang, Lihua 3,4; Luan, Zhendong 3,4,5; Zhang, Jianxing 3,4; Ma, Xiaochuan 3,4,5
刊名	GEOMORPHOLOGY
	2022-06-01
卷号	406 页码:14
关键词	Dune fields Bidirectional flow Morphology Tide the South China Sea
ISSN号	0169-555X
DOI	10.1016/j.geomorph.2022.108210
通讯作者	Ma, Xiaochuan(mxch@qdio.ac.cn)
英文摘要	Dune fields are composed of differently scaled of dunes and can reflect the external environmental conditions in both eolian and subaqueous environments. However, little is known about the interplay between dune fields when they meet together. Based on recent field observations, we identified new dune fields that encountered with other dunes migrating oppositely under a bidirectional flow system on the tidal shelf in the northwestern South China Sea. The dune fields, whose front boundary was outlined by the reversal of dune asymmetry, encountered each other end-by-end or side-by-side. Six encounter patterns were identified through the relative relation between dunes over the field boundary, which was associated with the net sand transport strength and sand supply. Under the control of the residual sand transport regime, dunes became steeper and more symmetrical towards the dune-field boundary and migrated gradually slower to the minimum. The regional net bedload transport determined the convergent migration of dunes in the encountering fields and shaped the linear, symmetrical, and steep shapes of dunes over the field boundary. The field boundary was shifting from 2014 to 2016, and most dunes close to the field frontier moved to their stoss side, thereby weakening the asymmetry extent or reversing the asymmetry. The field boundary shifts reflected location inconsistency between the long-term accumulative transport balance (symmetrical shape) and the recent transport balance (nonmigration) on dunes near field boundary which was ascribed to the modulation of residual sand transports associated with the systematic changes in the regional flow conditions. These results suggest that the behavior of dunes near the field boundary can sensitively reflect the field-field interplay and reveal the relevant minor environmental changes, thus providing new insights into the surface processes in a bidirectional flow system of a planet with eolian or subaqueous environments.
资助项目	National Natural Science Foundation of China[41876035] ; [157/iocas.2021.0023]
WOS研究方向	Physical Geography ; Geology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000795075900002
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/179245]
专题	海洋研究所_海洋环流与波动重点实验室
通讯作者	Ma, Xiaochuan
作者单位	1.Longyuan Beijing Wind Power Engn Design Consulting, Beijing 100083, Peoples R China 2.China Univ Geosci Beijing, Sch Ocean Sci, Beijing, Peoples R China 3.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao, Peoples R China 4.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Marine Geol & Environm, Qingdao, Peoples R China 5.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao, Peoples R China 6.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China
推荐引用方式 GB/T 7714	Li, Jinyuan,Yan, Jun,Feng, Xingru,et al. The encountering dune fields in a bidirectional flow system in the northwestern South China Sea: Pattern, morphology, and recent dynamics[J]. GEOMORPHOLOGY,2022,406:14.
APA	Li, Jinyuan.,Yan, Jun.,Feng, Xingru.,Song, Yongdong.,Xu, Tao.,...&Ma, Xiaochuan.(2022).The encountering dune fields in a bidirectional flow system in the northwestern South China Sea: Pattern, morphology, and recent dynamics.GEOMORPHOLOGY,406,14.
MLA	Li, Jinyuan,et al."The encountering dune fields in a bidirectional flow system in the northwestern South China Sea: Pattern, morphology, and recent dynamics".GEOMORPHOLOGY 406(2022):14.