The alteration of lateral circulation under the influence of human activities in a multiple channel system, Changjiang Estuary

He, Qing; Shen, Jian; Du, Jiabi

doi:10.1016/j.ecss.2020.106823

Cited by 13 publications

(8 citation statements)

References 60 publications

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“…During flood tide, the lateral flow is southward in the upper layer of the southern part and the lower layer of the northern part, and northward flow covers the lower layer of the southern part and the upper layer of the northern part at high water slack in Transect II (Figure 8k), and it is mostly southward at maximum flood tide (Figure 8l). This lateral flow structure at high/low water slack has also been reported in studying the influence of submerged dikes in the Yangtze River Estuary by Chen et al [55]. The Run 1 PRD-driven lateral flow magnitude is mostly less than 0.05 m•s −1 at four different tidal stages in Transect II.…”

Section: Salinity and Stratificationsupporting

confidence: 82%

The Response of Lateral Flow to Peak River Discharge in a Macrotidal Estuary

Yan

Song

Bao

et al. 2020

Water

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The Ou River, a medium-sized river in southeastern China, is selected to study the lateral flow response to rapidly varied river discharge, i.e., peak river discharge (PRD). A three-dimensional model based on the Finite-Volume Community Ocean Model is validated by in situ measurements from 15 June to 16 July 2005. PRD, which considers the extra buoyancy and longitudinal momentum in a short time, rebuilds the stratification and lateral flow. PRD, compared with low-discharge, generally makes stratification stronger and lateral flow weaker. PRD mainly rebuilds lateral flow by changing lateral advection, lateral Coriolis, and lateral-barotropic pressure gradient terms. After PRD, the salinity recovery time is longer than that of the flow because the impact on buoyancy lasts longer than that on longitudinal flow. Longitudinal flow is mostly affected by the momentum transferred during PRD; therefore, the recovery time is close to the flooding duration. However, the lateral flow is affected by the buoyancy, and its recovery time is generally longer than the flooding duration. The lateral flow recovery time depends on transect width, flow velocity and the variation caused by PRD. PRD occurs widely in global small-/medium-sized river estuaries, and the result of this work can be extended to other estuaries.

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Section: Salinity and Stratificationsupporting

confidence: 82%

The Response of Lateral Flow to Peak River Discharge in a Macrotidal Estuary

Yan

Song

Bao

et al. 2020

Water

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“…However, the role of Three Gorges Dam in changing the estuarine and coastal circulations is considered to be secondary referring to the underwater infrastructure in the North Passage (Wu et al, 2018c). The large-scale underwater construction (Figure 1B) in the vicinity of Hengsha Island greatly strengthens the tidal current (Zhang et al, 2018a), direction of rotation and vertical structure of the tidal ellipse (Pu et al, 2017) and thereby stability of the inside waters (Wan and Zhao, 2017), thus altering the stratification in the North Passage (Ma et al, 2011;Wan et al, 2014;Chen et al, 2020b). This underwater construction diminishes the freshwater partition in the South Channel while amplifies the onshore intrusion of saltwater in the South and North Passages, and alleviates the invasion of shelf waters in the North Channel by reducing/increasing the partition of riverine waters in the South/North Channel (Zhu et al, 2018a;Zhu et al, 2019).…”

Section: Anthropogenic Impactsmentioning

confidence: 99%

Advances on Coastal and Estuarine Circulations Around the Changjiang Estuary in the Recent Decades (2000–2020)

Liu

Gan

et al. 2021

Front. Mar. Sci.

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Advances on the circulation in the Changjiang Estuary and adjacent East China Sea (ECS) and Yellow Sea (YS) coastal waters in the recent decades (2000–2020) are synthesized in this review. The circulation over the complicated bathymetry in the region is locally driven by winds, tides, as well as riverine discharge, and is remotely influenced by shelf currents between the 50 and 100-m isobaths through the cross-shelf exchanges. The interchange of the momentum and the freshwater pathway inside the Changjiang Estuary are jointly determined by tides and seasonally varying discharge and winds over the shelf. The buoyant waters are trapped inside the bulge that forms and expands over the shelf to the west of the 30-m isobath in the vicinity of Hangzhou Bay and the Changjiang Estuary. These buoyant waters are exported offshore by the shelf current, tidal mixing, and variations of wind patterns, forming the Changjiang River plume, which shows notable seasonality due to the reversal of both winds and shelf currents in the ECS and YS. Extensive spatial irregularities in the form of freshwater patches are present along its pathway to the Tsushima Strait in summer and to the Taiwan Strait in winter, respectively. Tides and the bathymetry irregularity have recently been found to play critical roles in determining the cross-shelf exchanges of water mass and momentum along the pathway of the ECS coastal current, and along this pathway, a year-round upslope intrusion of shelf waters appears in both summer and winter. Tides also play an important role in altering the expansion of the Changjiang River plume, cross-shelf extrusion of waters, and variation in the Yellow Sea Coastal Current over the shallow Subei Shoal.

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“…Residual currents induced by river discharge prevail in the South Branch and landward reaches, while density currents, wind-driven currents, and coastal currents are of regional importance in the mouth and nearshore zones (Shen et al, 1989a(Shen et al, , 1989b. Other than the vertical density currents, the mouth zone is also featured by horizontal subtidal circulations driven by tide-induced Stokes transport inter-channel exchanges and significantly altered the horizontal circulations as well as the in-channel vertical circulations (Zhu et al, 2018;Chen et al, 2020).…”

Section: Estuarine Stratification and Circulationsmentioning

confidence: 99%

“…The in-channel lateral circulations adjust with the jetty-altered horizontal circulation, i.e., with enhanced stratification in the North Passage (Zhu et al, 2018;Zhou et al, 2019;Chen et al, 2020;Fig. S6).…”

Section: Estuarine Stratification and Circulationsmentioning

confidence: 99%

“…As a result, the intra-annual balance leads to relatively smaller net deposition at the decadal time scale. The jetties in the North Passage and the aggressive reclamation over the Nanhui flat have changed the circulation patterns in the mouth zone (Wu et al, 2018b;Chen et al, 2020), which as a result might alter the sedimentary dynamics in the subaqueous delta front regions.…”

Section: Long-term Sedimentation and Sediment Budgetmentioning

confidence: 99%

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