气候变化领域集成服务门户(CCPortal): A Numerical Study of Onshore Ripple Migration Using a Eulerian Two-phase Model

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DOI	10.1029/2020JC016773
	A Numerical Study of Onshore Ripple Migration Using a Eulerian Two-phase Model
	Salimi-Tarazouj A.; Hsu T.-J.; Traykovski P.; Cheng Z.; Chauchat J.
发表日期	2021
ISSN	21699275
卷号	126 期号:2
英文摘要	A new modeling methodology for ripple dynamics driven by oscillatory flows using a Eulerian two-phase flow approach is presented in order to bridge the research gap between near-bed sediment transport via ripple migration and suspended load transport dictated by ripple induced vortices. Reynolds-averaged Eulerian two-phase equations for fluid phase and sediment phase are solved in a two-dimensional vertical domain with a k-ε closure for flow turbulence and particle stresses closures for short-lived collision and enduring contact. The model can resolve full profiles of sediment transport without making conventional near-bed load and suspended load assumptions. The model is validated with an oscillating tunnel experiment of orbital ripple driven by a Stokes second-order (onshore velocity skewed) oscillatory flow with a good agreement in the flow velocity and sediment concentration. Although the suspended sediment concentration far from the ripple in the dilute region was underpredicted by the present model, the model predicts an onshore ripple migration rate that is in very good agreement with the measured value. Another orbital ripple case driven by symmetric sinusoidal oscillatory flow is also conducted to contrast the effect of velocity skewness. The model is able to capture a net offshore-directed suspended load transport flux due to the asymmetric primary vortex consistent with laboratory observation. More importantly, the model can resolve the asymmetry of onshore-directed near-bed sediment flux associated with more intense boundary layer flow speed-up during onshore flow cycle and sediment avalanching near the lee ripple flank which force the onshore ripple migration. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	orbital ripples; ripple migration; sediment transport; two-phase model
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186457
作者单位	Center for Applied Coastal Research, Civil and Environmental Engineering, University of Delaware, Newark, DE, United States; Applied Ocean Physics and Engineering, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Convergent Science, Inc., Madison, WI, United States; University of Grenoble Alpes, LEGI, Grenoble, France
推荐引用方式 GB/T 7714	Salimi-Tarazouj A.,Hsu T.-J.,Traykovski P.,et al. A Numerical Study of Onshore Ripple Migration Using a Eulerian Two-phase Model[J],2021,126(2).
APA	Salimi-Tarazouj A.,Hsu T.-J.,Traykovski P.,Cheng Z.,&Chauchat J..(2021).A Numerical Study of Onshore Ripple Migration Using a Eulerian Two-phase Model.Journal of Geophysical Research: Oceans,126(2).
MLA	Salimi-Tarazouj A.,et al."A Numerical Study of Onshore Ripple Migration Using a Eulerian Two-phase Model".Journal of Geophysical Research: Oceans 126.2(2021).