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

Sheng, Xiaoxuan; Mao, Xinyan; Yu, Jinzhen; Zhang, Xueqing; Jiang, Wensheng; Lu, Youyu

doi:10.1016/j.ecss.2022.108088

Cited by 3 publications

(2 citation statements)

References 38 publications

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“…The Fodu and Shuangyumen channels are connected to the Zhoushan Sea, whereas the Niubishan channel connects to the Damuyang Sea. Meanwhile, there are three secondary bays in Xiangshan Bay: the Xihu inlet, Tie inlet, and Huangdun inlet [1]. The total length of the Xiangshan Bay's coastline is about 390 km, with a distribution of natural and artificial coastlines.…”

Section: Introductionmentioning

confidence: 99%

Study on the Impact of the Coastline Changes on Hydrodynamics in Xiangshan Bay

Wang

et al. 2023

Applied Sciences

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Coastline changes have significant impacts on coastal hydrodynamics. Xiangshan Bay is a semi-closed and long-narrow bay located in Zhejiang Province, China. Its coastline has changed dramatically in recent decades; however, the variations in the small-scale hydrodynamics in the changed coastline areas have not been carefully studied. This study uses the Finite-Volume Community Ocean Model (FVCOM) to design a set of control experiments and five sets of compared experiments targeting the areas with significant coastline changes in Xiangshan Bay over the past 21 years. It was found that the coastline changes at the mouth of the bay, such as areas near Meishan Island and Dasong, have a significant impact on both residual currents and tidal currents, changing the amplitudes and phase distributions of the tides. Coastline changes in the inner bay have lesser impacts on hydrodynamics, mainly affecting the small-scale areas in the vicinity.

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Section: Introductionmentioning

confidence: 99%

Study on the Impact of the Coastline Changes on Hydrodynamics in Xiangshan Bay

Wang

et al. 2023

Applied Sciences

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“…However, these studies lack a quantitative analysis of the underlying dynamical mechanism. Sheng et al (2022) The Pearl River, as the third largest river in China, encompasses a complex hydrodynamic environment. The Pearl River estuary (PRE) is a trumpet-like estuary characterized by two deep channels and shallow shoals.…”

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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Influence of stratification and wind forcing on the dynamics of Lagrangian residual velocity in a periodically stratified estuary

Deng,

Jia,

Shi

et al. 2024

Ocean Sci.

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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 a barotropic component (vLba) and lower-layer inflow predominantly driven by a 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

Cited by 3 publications

References 38 publications

Study on the Impact of the Coastline Changes on Hydrodynamics in Xiangshan Bay

Study on the Impact of the Coastline Changes on Hydrodynamics in Xiangshan Bay

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

Influence of stratification and wind forcing on the dynamics of Lagrangian residual velocity in a periodically stratified estuary

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