DOI: 10.5194/hess-18-287-2014
Scopus记录号: 2-s2.0-84898789639
论文题名: Linking the river to the estuary: Influence of river discharge on tidal damping
作者: Cai H ; , Savenije H ; H ; G ; , Toffolon M
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2014
卷: 18, 期: 1 起始页码: 287
结束页码: 304
语种: 英语
Scopus关键词: Damping
; Iterative methods
; Mathematical techniques
; Wave propagation
; Analytical method
; Damping equations
; Implicit equation
; Model performance
; Nonlinear friction
; River discharge
; Theoretical framework
; Yangtze Estuary
; Estuaries
; amplitude
; analytical method
; damping
; estuarine front
; flow modeling
; flow velocity
; friction
; river discharge
; tidal cycle
; China
; Guangdong
; Modaomen Estuary
; Yangtze Estuary
; Zhujiang Estuary
英文摘要: The effect of river discharge on tidal damping in estuaries is explored within one consistent theoretical framework where analytical solutions are obtained by solving four implicit equations, i.e. the phase lag, the scaling, the damping and the celerity equation. In this approach the damping equation is obtained by subtracting the envelope curves of high water and low water occurrence, taking into account that the flow velocity consists of a tidal and river discharge component. Different approximations of the friction term are considered in deriving the damping equation, resulting in as many analytical solutions. In this framework it is possible to show that river discharge affects tidal damping primarily through the friction term. It appears that the residual slope, due to nonlinear friction, can have a substantial influence on tidal wave propagation when including the effect of river discharge. An iterative analytical method is proposed to include this effect, which significantly improved model performance in the upper reaches of an estuary. The application to the Modaomen and Yangtze estuaries demonstrates that the proposed analytical model is able to describe the main tidal dynamics with realistic roughness values in the upper part of the estuary where the ratio of river flow to tidal flow amplitude is substantial, while a model with negligible river discharge can be made to fit observations only with unrealistically high roughness values. © Author(s) 2014. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78346
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Water Management, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2600 GA Delft, Netherlands; Department of Civil, Environmental and Mechanical Engineering, University of Trento, Trento, Italy
Recommended Citation:
Cai H,, Savenije H,H,et al. Linking the river to the estuary: Influence of river discharge on tidal damping[J]. Hydrology and Earth System Sciences,2014-01-01,18(1)