气候变化领域集成服务门户(CCPortal): Observations of Enhanced Sediment Transport by Nonlinear Internal Waves

CCPortal

DOI	10.1029/2020GL088499
	Observations of Enhanced Sediment Transport by Nonlinear Internal Waves
	Zulberti A.; Jones N.L.; Ivey G.N.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:19
英文摘要	The mechanisms responsible for sediment resuspension and transport by nonlinear internal waves (NLIWs) remain poorly understood largely due to a dearth of detailed field measurements. We present novel observations of the turbulent benthic boundary-layer (BBL) beneath trains of NLIWs of depression in the ocean. At the 250 m deep, low-gradient (<0.2%) continental shelf site the BBL was near well mixed to an average height of about 10 m above the bottom. Above this bottom mixing-layer, stratification constrained the extent of vertical sediment transport. NLIWs drove sediment transport by a combination of bed-stress intensification, turbulent transport, and a vertical pumping mechanism associated with the compression and subsequent expansion of the mixing-layer. There was no evidence that the observed dynamics were associated with a global instability, as proposed in previous studies. The results have implications for cross-shelf mass transport and highlight future challenges for measuring and modeling boundary-layer processes within shelf seas. ©2020. The Authors.
英文关键词	Boundary layers; Mixing; Sediment transport; Sedimentation; Benthic boundary layers; Boundary layer process; Continental shelves; Global instability; Nonlinear internal wave; Pumping mechanism; Sediment re suspensions; Turbulent transports; Atmospheric thermodynamics; boundary layer; compression; continental shelf; internal wave; mass transport; mixing ratio; nonlinearity; observational method; pumping; sediment transport; turbulence
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169656
作者单位	Oceans Graduate School and Oceans Institute, University of Western Australia, Perth, WA, Australia
推荐引用方式 GB/T 7714	Zulberti A.,Jones N.L.,Ivey G.N.. Observations of Enhanced Sediment Transport by Nonlinear Internal Waves[J],2020,47(19).
APA	Zulberti A.,Jones N.L.,&Ivey G.N..(2020).Observations of Enhanced Sediment Transport by Nonlinear Internal Waves.Geophysical Research Letters,47(19).
MLA	Zulberti A.,et al."Observations of Enhanced Sediment Transport by Nonlinear Internal Waves".Geophysical Research Letters 47.19(2020).