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DOI	10.1016/j.advwatres.2020.103660
	Impacts of secondary and quarter-diurnal tidal species on backwater hydrodynamics in tidal rivers
	Zhang M.; Yang H.; Tang Q.; Cai H.; Zhu Z.; Feng A.; Luo M.; Gao H.; Tian X.
发表日期	2020
ISSN	0309-1708
卷号	143
英文摘要	As river flow debouches into the sea, it is affected by the tidal fluctuation at the estuary mouth, which results in a backwater zone, where the rising residual water level (averaged over a lunar day) in the landward direction is changing periodically. This is known as backwater hydrodynamics, especially the variation of the residual water levels that are controlled by the interplay between tide and river flows, while these hydrodynamics follow the traditional stage-river discharge relation in the upstream river-dominated region. However, the tidal asymmetry contributions to the residual water level that are caused by secondary tidal species (e.g., diurnal tide D1), overtide generation (e.g., the quarter-diurnal tide D4) and their interplay with river flow are poorly understood. In this study, we aim to understand the impacts of secondary and quarter-diurnal tidal species on the increase in residual water level in tidal rivers. To quantify the contributions made by different components, we decomposed the numerically computed subtidal friction into different components representing the contributions made by the river flow alone, the tide-river interaction, and tidal asymmetry due to the nonlinear interaction between different tidal species. The results show that the contribution by tidal asymmetry to the residual water level is minor, while the contributions by river flow and tide-river interaction are dominant, accounting for more than 90% and 80% at the upstream and downstream end of the estuary, respectively. The contribution made by river flow increases, while the tide-river interaction decreases in the landward direction. The semidiurnal tidal species (D2) predominantly control the residual water level induced by the tide-river interaction along the Yangtze estuary, which accounts for 70%, while the contributions made by the diurnal and quarter-diurnal tidal species are minor and comparable in magnitude in the seaward reach where tide-river interactions are important. The method proposed in this study to quantify the contributions of river flow and different tidal species to the residual water level will enhance our understanding of riverine and tidal impacts on estuarine backwater hydrodynamics and can be used to guide effective and sustainable water management in the Yangtze estuary and other tidal rivers with substantial river flow. © 2020 Elsevier Ltd
关键词	Estuaries Hydrodynamics Stream flow Water conservation Water levels Water management Diurnal tides Nonlinear interactions Residual waters River discharge Sustainable water management Tidal asymmetry Tidal fluctuation Yangtze Estuary Rivers backwater flow modeling hydrodynamics numerical model river discharge river flow streamwater sustainability water level China Yangtze Estuary
语种	英语
来源机构	Advances in Water Resources
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/131748
推荐引用方式 GB/T 7714	Zhang M.,Yang H.,Tang Q.,et al. Impacts of secondary and quarter-diurnal tidal species on backwater hydrodynamics in tidal rivers[J]. Advances in Water Resources,2020,143.
APA	Zhang M..,Yang H..,Tang Q..,Cai H..,Zhu Z..,...&Tian X..(2020).Impacts of secondary and quarter-diurnal tidal species on backwater hydrodynamics in tidal rivers.,143.
MLA	Zhang M.,et al."Impacts of secondary and quarter-diurnal tidal species on backwater hydrodynamics in tidal rivers".143(2020).