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DOI	10.1007/s11069-021-04696-8
	Numerical study of rip currents interlaced with multichannel sandbars
	Hong X.; Zhang Y.; Wang B.; Zhou S.; Yu S.; Zhang J.
发表日期	2021
ISSN	0921030X
起始页码	593
结束页码	605
卷号	108 期号:1
英文摘要	Rip currents have become one of the primary coastal hazards globally. In the present work, the dynamics of a multichannel rip system are revealed by a group of numerical simulations over truncated sandbar bathymetry under varying wave conditions. It is found that increasing wave height may disperse rip currents due to strong wave-current shear in opposite directions and the resulting microbreaking, which is contrary to the widely accepted proportional theory. The pump-feed phenomenon between adjacent channels shows that rip currents might be absent in small channels when water flows through neighboring broader pathways. Rip currents are indicated highly sensitive to wave direction and deflect into undulant alongshore currents around sandbars as waves deviate from normal incidence. The decay of rip currents with wave angle did not show a clear dependence on channel width, which was found in previous studies. Vortices usually appear near bar-channel edges and by sides of rip currents. The magnitude of the vortex is not explicitly related to the wave height but increases with the wave angle. The water setup shoreward by sandbars substantially increases with wave angle, while the surface depression over rip channels is less observed. This indicates a lower pressure differential to drive feeder flows toward the channels and explains why rip currents cannot persist when incident waves become slightly oblique. © 2021, The Author(s), under exclusive licence to Springer Nature B.V.
关键词	Beach Numerical modeling Rip current Sandbar Wave
语种	英语
来源期刊	Natural Hazards
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206278
作者单位	South China Sea Prediction Center, State Oceanic Administration, Guangzhou, 510000, China; National Marine Hazard Mitigation Service, Beijing, 100000, China; Ministry of Natural Resources, Beijing, 100000, China
推荐引用方式 GB/T 7714	Hong X.,Zhang Y.,Wang B.,et al. Numerical study of rip currents interlaced with multichannel sandbars[J],2021,108(1).
APA	Hong X.,Zhang Y.,Wang B.,Zhou S.,Yu S.,&Zhang J..(2021).Numerical study of rip currents interlaced with multichannel sandbars.Natural Hazards,108(1).
MLA	Hong X.,et al."Numerical study of rip currents interlaced with multichannel sandbars".Natural Hazards 108.1(2021).