气候变化领域集成服务门户(CCPortal): Wave-Driven Mean Flow Dynamics in Submerged Canopies

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DOI	10.1029/2019JC015935
	Wave-Driven Mean Flow Dynamics in Submerged Canopies
	van Rooijen A.; Lowe R.; Rijnsdorp D.P.; Ghisalberti M.; Jacobsen N.G.; McCall R.
发表日期	2020
ISSN	21699275
卷号	125 期号:3
英文摘要	The physical roughness (canopies) formed by organisms within aquatic ecosystems (e.g., seagrass, kelp, and mangroves) modifies the local wave-driven hydrodynamics within coastal and estuarine regions. In wave-dominated environments, an understanding of the mean wave-driven flows generated within and above canopies is important, as it governs material transport (e.g., of nutrients, sediment, and biota). However, until recently the effect of submerged canopies on wave-current interactions and the resulting mean (wave-averaged) flow dynamics has received relatively little attention. In this study, a combination of wave flume experiments and numerical modeling is used to investigate the wave-induced mean flow profiles in the presence of a submerged canopy. The measured velocities and vegetation forces were used to derive bulk drag and inertia coefficients, and to validate a nonhydrostatic 2DV wave-flow model. The numerical model results were used to conduct an in-depth analysis of the mean horizontal momentum terms responsible for driving the mean (horizontal) flow within and above the submerged canopies. We show that the mean canopy hydrodynamics are driven by vertical gradients in wave and turbulent Reynolds stresses, balanced by the mean canopy drag forces. The wave Reynolds stress gradient is the dominant force driving the in-canopy mean flow and is directly related to the vorticity that is generated when the wave orbital motions become rotational near the canopy interface. This study provides new insight in the mechanisms responsible for wave-driven mean flows within submerged canopies and guidance for how these hydrodynamics can be predicted in coastal wave-circulation models. ©2020. American Geophysical Union. All Rights Reserved.
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/186935
作者单位	School of Earth Sciences, University of Western Australia, Perth, WA, Australia; UWA Oceans Institute, University of Western Australia, Perth, WA, Australia; ARC Centre of Excellence for Coral Reef Studies, University of Western Australia, Perth, WA, Australia; Deltares, Delft, Netherlands; Oceans Graduate School, University of Western Australia, Perth, WA, Australia; Wave Energy Research Centre, University of Western Australia, Albany, WA, Australia
推荐引用方式 GB/T 7714	van Rooijen A.,Lowe R.,Rijnsdorp D.P.,et al. Wave-Driven Mean Flow Dynamics in Submerged Canopies[J],2020,125(3).
APA	van Rooijen A.,Lowe R.,Rijnsdorp D.P.,Ghisalberti M.,Jacobsen N.G.,&McCall R..(2020).Wave-Driven Mean Flow Dynamics in Submerged Canopies.Journal of Geophysical Research: Oceans,125(3).
MLA	van Rooijen A.,et al."Wave-Driven Mean Flow Dynamics in Submerged Canopies".Journal of Geophysical Research: Oceans 125.3(2020).