Decadal variability of tidal dynamics in the Pearl River Delta: Spatial patterns, causes, and implications for estuarine water management

Cai, Huayang; Huang, Jingzheng; Niu, Lixia; Ren, Lei; Liu, Feng; Ou, Suying; Yang, Qingshu

doi:10.1002/hyp.13291

Cited by 19 publications

(8 citation statements)

References 49 publications

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“…Lingdingyang Bay is a funnel-shaped subaqueous delta and has a 235 complicated geomorphology pattern with two deep channels (i.e., East and West Channels) between three shoals (i.e., East, Middle and West Shoals) (see Figure 4c). The tide in Lingdingyang Bay mainly come from the Pacific Ocean and has an irregular and semidiurnal character, with a mean tidal range between 1.0 and 1.7 m (Mao et al, 2004 with a mean tidal range of approximately 3.6 m, after which it is damped until vanishing (Cai et al, 2019).…”

Section: Overview Of Lingdingyang Baymentioning

confidence: 99%

A novel approach for the assessment of morphological evolution based on observed water levels in tide-dominated estuaries

Cai¹,

Zhang²,

Garel³

et al. 2020

Preprint

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Abstract. Assessing the impacts of both natural (e.g., tidal forcing from the ocean) and human-induced changes (e.g., dredging for navigation, land reclamation) on estuarine morphology is particularly important for the protection and management of the estuarine environment. In this study, a novel analytical approach is proposed for the assessment of estuarine morphological evolution in terms of tidally averaged depth on the basis of the observed water levels along the estuary. The key lies in deriving a relationship between wave celerity and tidal damping or amplification. For given observed water levels at two gauging stations, it is possible to have a first estimation of both wave celerity (distance divided by tidal travelling time) and tidal damping or amplification rate (tidal range difference divided by distance), which can then be used to predict the morphological changes via an inverse analytical model for tidal hydrodynamics. The proposed method is applied to the Lingdingyang Bay of the Pearl River Estuary, located on the southern coast of China, to analyse the historical development of the tidal hydrodynamics and morphological evolution. The analytical results show surprisingly good correspondence with observed water depth and volume in this system. The merit of the proposed method is that it provides a simple approach for understanding the decadal evolution of the estuarine morphology through the use of observed water levels, which are usually available and can be easily measured.

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Section: Overview Of Lingdingyang Baymentioning

confidence: 99%

A novel approach for the assessment of morphological evolution based on observed water levels in tide-dominated estuaries

Cai¹,

Zhang²,

Garel³

et al. 2020

Preprint

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“…This estuary thus acts as a dynamic zone of source-sink exchange (Geeraert et al, 2021;Jia et al, 2021;Niu et al, 2021). The principal mechanisms of nutrient transportation in this estuary are complicated because of the strong mixing of freshwater and saline water (Cai et al, 2018;Tao et al, 2020). However, there are still few studies addressing the interacting effects of river discharge and marine current on nutrient status in the PRE.…”

Section: Introductionmentioning

confidence: 99%

Nutrient Pollution and Its Dynamic Source-Sink Pattern in the Pearl River Estuary (South China)

Tao¹,

Niu²,

Dong³

et al. 2021

Front. Mar. Sci.

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Nutrient enrichment and its quantitative cause-effect chains of the biogeochemical processes have scarcely been documented in the Pearl River Estuary (South China). Field investigations of nutrient samples taken between 1996 and 2018 showed significant differences in nitrogen and phosphorus with times and sites. The concentrations of DIN and DIP gradually increased over the past two decades, with good fitted linear curves (R2 = 0.31 for DIN, R2 = 0.92 for DIP); while the temporal variation in DSi was non-significant. Higher levels of nitrogen and silicate mainly appeared in the upper estuary because of the riverine influence. The phosphorus pollution was accumulated in the northeast (e.g., Shenzhen bay). The aquatic environment was highly sensitive to nutrient pollution and eutrophication risk, which accordingly corresponded to high phytoplankton production and biodiversity. Phosphorus was the limiting factor of phytoplankton growth in this estuary, and more frequently caused the eutrophication risks and blooms. The nutrient pollution was largely influenced by riverine inputs, quantified by PCA-generation, and the contributions of coastal emission and atmospheric deposition were followed. The two-end member mixing model differentiated the physical alterations from the biological activity and identified the dynamic source-sink patterns of nutrient species. Nitrogen and silicate had relatively conservative behaviors in the estuary and phosphate showed an active pattern.

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“…Y. Wu et al, 2016). Furthermore, these morphological changes have resulted in changes in tidal dynamics (Zhang et al, 2010;Deng and Bao, 2011). Our study can provide a new method to explore the morphological evolution, which provides scientific guidelines for management and regulation projects in estuaries.…”

Section: H Cai Et Al: Morphological Evolution In Tide-dominated Estmentioning

confidence: 87%

A novel approach for the assessment of morphological evolution based on observed water levels in tide-dominated estuaries

Cai

Ping

Garel

et al. 2020

Hydrol. Earth Syst. Sci.

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Abstract. Assessing the impacts of both natural (e.g. tidal forcing from the ocean) and human-induced changes (e.g. dredging for navigation and land reclamation) on estuarine morphology is particularly important for the protection and management of the estuarine environment. In this study, a novel analytical approach is proposed for the assessment of estuarine morphological evolution in terms of tidally averaged depth on the basis of the observed water levels along the estuary. The key lies in deriving a relationship between wave celerity and tidal damping or amplification. For given observed water levels at two gauging stations, it is possible to have a first estimation of both wave celerity (distance divided by tidal travelling time) and tidal damping or amplification rate (tidal range difference divided by distance), which can then be used to predict the morphological changes via an inverse analytical model for tidal hydrodynamics. The proposed method is applied to the Lingdingyang Bay of the Pearl River Estuary, located on the southern coast of China, to analyse the historical development of the tidal hydrodynamics and morphological evolution. The analytical results show surprisingly good correspondence with observed water depth and volume in this system. The merit of the proposed method is that it provides a simple approach for understanding the decadal evolution of the estuarine morphology through the use of observed water levels, which are usually available and can be easily measured.

show abstract

Decadal variability of tidal dynamics in the Pearl River Delta: Spatial patterns, causes, and implications for estuarine water management

Cited by 19 publications

References 49 publications

A novel approach for the assessment of morphological evolution based on observed water levels in tide-dominated estuaries

A novel approach for the assessment of morphological evolution based on observed water levels in tide-dominated estuaries

Nutrient Pollution and Its Dynamic Source-Sink Pattern in the Pearl River Estuary (South China)

A novel approach for the assessment of morphological evolution based on observed water levels in tide-dominated estuaries

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