Frictional interactions between tidal constituents in tide-dominated estuaries

Cai, Huayang; Toffolon, Marco; Savenije, Hubert; Yang, Qian; Garel, Erwan

doi:10.5194/os-2018-53

Cited by 1 publication

(4 citation statements)

References 9 publications

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“…We developed an analytical approach to link average water depths to tidal regime shifts to understand how morphological alteration affects tidal hydrodynamics in estuaries. The hydrodynamic model proposed by Cai et al (2018) was used to explore hydrodynamic changes in Lingdingyang Bay, where we observed an apparent hydrodynamics regime shift as a result of channel deepening and narrowing caused by human‐induced interventions (e.g., channel dredging, sand excavation, and land reclamation).…”

Section: Discussionmentioning

confidence: 93%

“…To predict the responses of hydraulic processes to future changes, it is necessary to understand the impacts of human interventions on the tidal regimes of estuaries. As the analytical approach has also been successfully applied in Guadiana Estuary (Cai et al, 2018), our approach for quantifying the impacts of morphological alterations on tidal hydrodynamics in Lingdingyang Bay could be applied more broadly for tide‐dominated estuaries worldwide, where human interventions (i.e., channel deepening) are taking place.…”

Section: Discussionmentioning

confidence: 99%

“…To explicitly account for the mutual interactions between different tidal constituents, Cai et al (2018) adopted a conceptual model that makes use of Chebyshev polynomials and that accounts for the velocities induced by the different tidal constituents (e.g., M 2 , S 2 , K 1 , and O 1 ) by summing them in the friction term. As such, an iterative procedure was adopted to reproduce the tidal dynamics for each tidal constituent using a correction factor to adjust the linearized friction term.…”

Section: Methodsmentioning

confidence: 99%

“…However, the hydrodynamic regime shifts resulting from such morphological changes, and the related underlying mechanisms are still unclear. Here we use an analytical model developed by Cai, Savenije, Yang, & Garel (2018) that accounts for the mutual nonlinear interactions between different tidal constituents to examine the impact of large‐scale changes in geometry on tidal regime shifts in a convergent estuary.…”

Section: Introductionmentioning

confidence: 99%

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Tidal regime shift in Lingdingyang Bay, the Pearl River Delta: An identification and assessment of driving factors

Wang

Ping

Zhou

et al. 2020

Hydrological Processes

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Both natural changes (e.g., tidal forcing from the ocean and global sea level rise) and human‐induced changes (e.g., dredging for navigation, sand excavation, and land reclamation) exert considerable influences on the long‐term evolution of tidal regimes in estuaries. Evaluating the impacts of these factors on tidal‐regime shifts is particularly important for the protection and management of estuarine environments. In this study, an analytical approach is developed to investigate the impacts of estuarine morphological alterations (mean water depth and width convergence length) on tidal hydrodynamics in Lingdingyang Bay, Southeast China. Based on the observed tidal levels from two tidal gauging stations along the channel, tidal wave celerity and tidal damping/amplification rate of different tidal constituents are computed using tidal amplitude and phase of tidal constituents extracted from a standard harmonic analysis. We show that the minimum mean water depth for the whole estuary occurred in 2006, whereas a shift in tidal wave celerity for the M2 tide component occurred in 2009. As such, the study period (1990–2016) could be separated into pre‐human (1990–2009) and post‐human (2010–2016) phases. Our results show that the damping/amplification rate and celerity of the M2 tide have increased by 31% (from 7 to 9.2 m−1) and 28% (from 7 to 9 m·s−1) respectively, as a consequence of the substantial impacts of human interventions. The proposed analytical method is subsequently applied to analyse the historical development of tidal hydrodynamics and regime shifts induced by human interventions, thus linking the evolution of estuarine morphology to the dominant tidal hydrodynamics along the channel. The observed tidal regime shift is primarily caused by channel deepening, which substantially enlarged the estuary and reduced effective bottom friction resulting in faster celerity and stronger wave amplification. Our proposed method for quantifying the impacts of human interventions on tidal regime shifts can inform evidence‐based guidelines for evaluating hydraulic responses to future engineering activities.

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Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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