Characteristics and Driving Mechanisms of Mixing and Stratification in the North Passage of the Changjiang Estuary, China

Wang, Yajun; Jiang, Chenjuan; Cheng, Heqin; Li, Weihua; Teng, Lizhi

doi:10.2112/jcoastres-d-21-00053.1

Cited by 2 publications

(5 citation statements)

References 26 publications

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“…The results of this paper are consistent with that of North Passage presented by Wang et al [13]. In the active reaches of the saline wedge, due to the periodic movement of tidal flow, the mixing and stratification are mainly dominated by longitudinal advection and tidal stirring.…”

Section: Discussionsupporting

confidence: 92%

“…Based on the measured data above, the Gradient Richardson Number (Ri), Simpson Number (Si) and Potential Energy Anomaly (Φ) of the water column were calculated to analyze the tidal and fortnightly variation of the stratification. Following Wang et al [13], the extended Simpson's one-dimensional Φ equation was used to analyze the driving mechanism of mixing and stratification processes, by calculating the contribution terms of the time derivative of Φ.…”

Section: Discussionmentioning

confidence: 99%

“…where ρ is the vertical density profile, ρ is the depth-mean density, h is the water column depth, η is the water surface fluctuation, z is the vertical coordinate, and g is the gravitational acceleration. Following Wang et al's approach [13], the time derivative of Φ (φ t ) can be written as…”

Section: Potential Energy Anomaly (φ)mentioning

confidence: 99%

“…Pu et al unraveled river effects from tidal straining term by decomposing the flow into tidal flow and river flow when analyzing the stratification of the North Passage in the Changjiang estuary based on Simpson's Φ-equation [12]. Recently, the Simpson's Φ-equation was extended by taking into account the vertical difference of the horizontal density gradient, including depthmean straining, advection, non-mean straining and tidal stirring [13]. Additionally, a three-dimensional Φ-equation was derived based on the dynamic equations for potential temperature and salinity, the continuity equation and an equation of state for the potential density, which provides a tool for numerically quantifying all terms relevant for generation and destruction of stratification [1,14].…”

Section: Introductionmentioning

confidence: 99%

“…Studies on the stratification of the Changjiang Estuary mainly focused on the North Passage [12,13], and the main driving mechanisms are tidal advection, tidal straining, river effects and tidal stirring. There are few studies on the stratification of the other three outlets of the Changjiang Estuary.…”

Section: Introductionmentioning

confidence: 99%

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The Impact of Tidal Straining and Advection on the Stratification in a Partially Mixed Estuary

Zhang

Wang

et al. 2023

Water

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Stratification and mixing of the water column is an important dynamic process in the estuary, which plays a significant role in the estuarine circulation, mass transport and energy exchange. Based on the multi-station synchronous observation data from 26 February to 6 March in 2011 during dry season in the North Channel of the Changjiang Estuary, the Richardson number, the Simpson number and the potential energy anomaly of water were calculated to analyze the tidal variation of the mixing and stratification processes. The roles of the depth-mean straining, longitudinal advection, non-mean straining and tidal stirring in the processes of mixing and stratification of the water column were analyzed by calculating the contribution terms of the time-derivative of potential energy anomaly. The results show that the mixing and stratification of the water column in the North Channel have significant spatiotemporal variation. Stability of the stratification gradually decreases from neap tide to spring tide. In the reaches of salt wedge migration, permanent stratification develops during neap and mean tide, with stability increasing on the flood and decreasing on the ebb, which is dominated by longitudinal advection. During spring tide, periodic stratification develops, with development of stratification on the flood and its breakdown on the ebb, which is dominated by longitudinal advection and tidal stirring. In the main reaches of saltwater intrusion, permanent stratification develops during neap tide, with stability increasing on the ebb and decreasing on the flood, which is dominated by depth-mean tidal straining. During mean and spring tide, periodic stratification occurs, with development of stratification on the ebb and its breakdown on the flood, which is controlled by depth-mean tidal straining and assisted by tidal stirring. In the North Channel, tidal advection is the main stratifying agent in the salt wedge migration reaches, and tidal straining is the main stratifying agent in the main reaches of saltwater intrusion.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Potential Energy Anomaly (φ)mentioning

confidence: 99%