气候变化领域集成服务门户(CCPortal): Quantifying Seasonal Seagrass Effects on Flow and Sediment Dynamics in a Back-Barrier Bay

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DOI	10.1029/2020JC016547
	Quantifying Seasonal Seagrass Effects on Flow and Sediment Dynamics in a Back-Barrier Bay
	Zhu Q.; Wiberg P.L.; Reidenbach M.A.
发表日期	2021
ISSN	21699275
卷号	126 期号:2
英文摘要	Seagrass growth and senescence exert a strong influence on flow structure and sediment transport processes in coastal environments. However, most previous studies of seasonal seagrass effects either focused on small-scale field measurements or did not fully resolve the synergistic effects of flow-wave-vegetation-sediment interaction at a meadow scale. In this study, we applied a coupled Delft3D-FLOW and SWAN model that included effects of seagrass on flow, waves, and sediment resuspension in a shallow coastal bay to quantify seasonal seagrass impacts on bay dynamics. The model was extensively validated using seasonal field hydrodynamic and suspended sediment data within a seagrass meadow and a nearby unvegetated site. Our results show that seagrass meadows significantly attenuated flow (60%) and waves (20%) and reduced suspended sediment concentration (85%) during summer when its density reached a maximum. Probability density distributions of combined wave-current bed shear stress within the seagrass meadow indicate that significant reductions in sediment resuspension during summer were mainly caused by flow retardation rather than wave attenuation. Although low-density seagrass in winter resulted in much smaller reductions in flow and waves compared with summer meadows, small changes in winter seagrass density resulted in large differences in the magnitude of attenuation of flow and shear stress. Similarly, while high seagrass densities effectively trapped sediment during summer, small changes in winter density resulted in strong changes in net sediment flux into/out of the meadow. At our study site, low seagrass densities provided significant reductions in wintertime sediment loss compared to losses associated with completely unvegetated conditions. © 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/186469
作者单位	Department of Environmental Sciences, University of Virginia, Charlottesville, VA, United States
推荐引用方式 GB/T 7714	Zhu Q.,Wiberg P.L.,Reidenbach M.A.. Quantifying Seasonal Seagrass Effects on Flow and Sediment Dynamics in a Back-Barrier Bay[J],2021,126(2).
APA	Zhu Q.,Wiberg P.L.,&Reidenbach M.A..(2021).Quantifying Seasonal Seagrass Effects on Flow and Sediment Dynamics in a Back-Barrier Bay.Journal of Geophysical Research: Oceans,126(2).
MLA	Zhu Q.,et al."Quantifying Seasonal Seagrass Effects on Flow and Sediment Dynamics in a Back-Barrier Bay".Journal of Geophysical Research: Oceans 126.2(2021).