Initial time dependence of wind- and density-driven Lagrangian residual velocity in a tide-dominated bay

Liu, Guangliang; Liu, Zhe; Gao, Huiwang; Feng, Sha

doi:10.1007/s10236-021-01447-y

Cited by 6 publications

(2 citation statements)

References 58 publications

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“…The movement pattern over a longer period can be understood by the accumulation of the U shown). As illustrated in the previous numerical and theoretical investigations (e.g., Feng et al, 1986;Feng et al, 2008;Muller et al, 2009;Liu et al, 2012;Liu et al, 2021), U * L in the generally non-linear system highly depended on the initial time, even in a purely periodic, single tidal constituent-driven barotropic system. To remove the dependence of the residual current on the initial release time and illustrate the mean seasonal transport pattern, the particles were released every 2 h within 3 months of summer and winter.…”

Section: Lagrangian Particle Trackingmentioning

confidence: 65%

Hydrodynamical transport structure and lagrangian connectivity of circulations in the Pearl River Estuary

Chu

Liu

et al. 2022

Front. Mar. Sci.

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Using a three-dimensional (3D) hydrodynamic model, this study explored the seasonal hydrodynamic transport structure in the Pearl River Estuary and illustrated the intrinsic connectivity under multiscale motions from a Lagrangian perspective. Generally, the surface Lagrangian residual current (UL) is uniformly southwestward/southeastward in summer/winter, with a stronger intensity in the lower estuary. The bottom UL features in the southeastward direction in the upper estuary and northwest direction in the lower estuary. The fluvial–tide interaction line advances southeastward and northwestward in summer and winter, respectively. The UL captured the major transport processes and was in good agreement with the mean surface sediment transport patterns. In the transition region between Lantau Island and Neilingding Island, where it is largely affected by the interaction between the periodic tidal current and river discharge, the spatially averaged UL showed intensified intratidal variations and had a larger difference with the locally temporally averaged Eulerian residual current. The remarkable Lagrangian coherent structures that illustrated the transport paths and transport convergence regions were identified, which are generally consistent with the bottom sediment depocenters. Based on the Lagrangian connectivity analysis, it was revealed that a barrier between the western and eastern estuaries existed, which was weakened by the strong river discharge during summer. Two convergence regions near the Macau and Hong Kong waters were identified, where the sediment and pollutants easily settled. The study demonstrated the importance of the Lagrangian view in understanding the hydrodynamic process and transport structure in the estuary–shelf regions.

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Section: Lagrangian Particle Trackingmentioning

confidence: 65%

Hydrodynamical transport structure and lagrangian connectivity of circulations in the Pearl River Estuary

Chu

Liu

et al. 2022

Front. Mar. Sci.

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“…However, this study aims to illustrate structural and magnitudinal variations of the total LRV under different factors, without delving into the underlying dynamic mechanisms. Liu et al (2021) demonstrated that the influence of wind and density gradients on LRV is closely associated with the initial tidal phase based on the momentum equations, but the specific contribution of each dynamic component to LRV remains poorly studied. Jiang and Feng (2014) explored the dynamical mechanisms for the LRV, which gives to the assumptions of a constant eddy viscosity and linear bottom friction in the entire estuarine.…”

Section: Introductionmentioning

confidence: 99%

Influence of Stratification and Wind Forcing on the Dynamics of Lagrangian Residual Velocity in a Periodically Stratified Estuary

Deng,

Jia,

Shi

et al. 2023

Preprint

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Abstract. Wind and stratification play pivotal roles in shaping the structure of the Lagrangian residual velocity (LRV). However, the intricate dynamics by which wind and stratification modify the LRV remain poorly studied. This study derives numerical solutions of LRV components and eddy viscosity subcomponents to elucidate the dynamics within the periodically stratified Pearl River estuary. The vertical shear cross-estuary LRV (uL) is principally governed by the interplay among the eddy viscosity component (uLtu), the barotropic component (uLba), and the baroclinic component (uLgr) under stratified conditions. During neap tides, southwesterly winds notably impact uL by escalating uLtu by an order of magnitude within the upper layer. This transforms the eastward flow dominated by uLtu under wind influence into a westward flow dominated by uLba in upper shoal regions without wind forcing. The along-estuary LRV exhibits a gravitational circulation characterized by upper-layer outflow engendered by barotropic component (vLba) and lower-layer inflow predominantly driven by baroclinic component (vLgr). The presence of southwesterly winds suppresses along-estuary gravitational circulation by diminishing the magnitude of vLba and vLgr. The contributions of vLba and vLgr are approximately equal, while the ratio between uLba and uLgr (uLtu) fluctuates within the range of 1 to 2 in stratified waters. Under unstratified conditions, LRV exhibits a lateral shear structure due to differing dominant components compared to stratified conditions. In stratified scenarios, the eddy viscosity component of LRV is predominantly governed by the turbulent mean component, while it succumbs to the influence of the tidal straining component in unstratified waters.

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Modeling Lagrangian residual velocity in a tide-dominated long-narrow bay: case study of the inner Xiangshan Bay

Sheng¹,

Mao²,

Yu³

et al. 2022

Estuarine, Coastal and Shelf Science

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Initial time dependence of wind- and density-driven Lagrangian residual velocity in a tide-dominated bay

Cited by 6 publications

References 58 publications

Hydrodynamical transport structure and lagrangian connectivity of circulations in the Pearl River Estuary

Hydrodynamical transport structure and lagrangian connectivity of circulations in the Pearl River Estuary

Influence of Stratification and Wind Forcing on the Dynamics of Lagrangian Residual Velocity in a Periodically Stratified Estuary

Modeling Lagrangian residual velocity in a tide-dominated long-narrow bay: case study of the inner Xiangshan Bay

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