Tidal straining effect on the suspended sediment transport in the Huanghe (Yellow River) Estuary, China

Wang, Xiaohua; Wang, Houjie

doi:10.1007/s10236-010-0298-y

Cited by 21 publications

(10 citation statements)

References 38 publications

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“…Lower saline water is trapped in fluid mud at the point in time of restratification, while advection of higher saline water continues in the upper layer. Such inverse salinity profiles were observed also in other high‐concentration estuarine domains (e.g., the Huanghe, Wang & Wang, ; in the Gironde, Sottolichio et al, ; or in the Ouse estuary, Uncles et al, ). Here the hydraulic cross section is reduced due to mud‐induced stratification, which increases the salinity intrusion in the upper layer, into the estuary.…”

Section: Discussionmentioning

confidence: 56%

Observations of Mud‐Induced Periodic Stratification in a Hyperturbid Estuary

Becker

Maushake

2018

Geophysical Research Letters

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This study presents new observations of fluid mud transport and of the interaction between mud‐induced stratification and the flow. Data collected in a hyperturbid estuarine tidal channel reveal details of the intratidal entrainment asymmetry, characterized by quasi‐instantaneous entrainment and upstream pumping of mud during flood, and a gradual reduction of layer thickness by shear dispersion during ebb. Rapid restratification early during the flood phase restores the predominant two‐layer structure and delimits the transport period, which is then significantly shorter than the overall flood duration. The hydraulic cross section is reduced, causing an increase of the salinity intrusion into the estuary at the end of the flood. The fluid mud layer occupies on average 40% of the water depth, and stratification exceeds that of highly stratified salt wedge estuaries. These data show how mud‐induced periodic stratification influences flow structure and sediment transport and thereby contribute to the understanding of the dynamics of hyperturbid estuaries.

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Section: Discussionmentioning

confidence: 56%

Observations of Mud‐Induced Periodic Stratification in a Hyperturbid Estuary

Becker

Maushake

2018

Geophysical Research Letters

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“…The net sediment flux (Figure b) indicates both the turbid waters from Hengsha Shoalwater and Jiuduansha Shoalwater can flow into the DNC, forming a highly stratified sediment tongue rather than an ETM. The stratified BBL reduces the mixing, thus encouraging flocculation of sediment particles in the hyperpycnal flow [ Wang and Wang , ]. The bottom water in the turbidity zone is hence further stratified by the SSC and a lutocline develops (Figure b).…”

Section: Model Results and Discussionmentioning

confidence: 99%

Suspended sediment transport in the Deepwater Navigation Channel, Yangtze River Estuary, China, in the dry season 2009: 2. Numerical simulations

Song

Wang

2013

J. Geophys. Res. Oceans

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[1] A three-dimensional wave-current-sediment coupled numerical model with wetting and drying process is developed to understand hydrodynamics and sediment transport dynamics in the Deepwater Navigation Channel (DNC), the North Passage of the Yangtze River Estuary (YRE), China. The model results are in good agreement with observed data, and statistics show good model skill scores and correlation coefficients. The model well reproduces the spring-neap variation between a well-mixed estuary and a highly stratified estuary. Model results indicate that the estuarine gravitational circulation plays the most important role in the estuarine turbidity maximum (ETM) formation in the DNC. The upstream nonlocal sediment intrusion through the spillover mechanism is a major source of sediment trapping in the North Passage after the morphological changes. Numerical studies are conducted to show scenarios in the YRE under the effects of different forcings (river discharges, waves, and winds). Between these study cases, surface-wave-breaking relieves the sediment trapping and bottomwave-current-interaction aggravates the bed erosion and elevates the SSC in the ETM; the former and the latter have the least and largest influence on the suspended sediment transport in the DNC. The wind effects have a greater influence on sediment trapping than the river discharges, and the steady northwesterly wind condition favors the siltation in the DNC most. The significance of density-driven turbidity current is also assessed, which can enhance the saline-water intrusion and suppress the turbulent mixing in the bottom boundary layer.

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“…Sediment‐induced stratification might be important in some muddy estuaries, such as the Yellow River Estuary, China [ Wang and Wang , ]. Here, the contribution to stratification by salinity and SSC on site A0 can be evaluated based on the field measurements.…”

Section: Discussionmentioning

confidence: 99%

Suspended sediment transport in the Deepwater Navigation Channel, Yangtze River Estuary, China, in the dry season 2009: 1. Observations over spring and neap tidal cycles

Song¹,

Wang²,

Cao³

et al. 2013

J. Geophys. Res. Oceans

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[1] The in situ data in the Deepwater Navigation Channel (DNC), Yangtze River Estuary (YRE), China, in the dry season 2009, shows spring tides associated with greater maximum velocities, more mixing, less stratification, and diffused fluid mud; whereas neap tides are associated with smaller maximum velocities, greater stratification, inhibited mixing, and stratified fluid muds. The balance of salt flux indicates the seaward salt transport is dominated by fluvial flows, and the landward salt transport is generated by compensation flows during spring tides, but shear effects during neap tidal cycles. The balance of suspended sediment flux illustrates the offshore sediment transport is dominated by fluvial flows as well, but the onshore transport is induced by tidal-pumping effects on spring tides, and shear effects on neaps. The suspended sediment transport is strongly affected by the salinity distribution and salinity-gradient-induced stratification in the DNC. The spring-neap asymmetry is generated by the estuarine gravitational circulation during low-flow conditions; while the flood-ebb asymmetric stratification within a tidal cycle is due to the semidiurnal tidally movement of the salt front.

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Tidal straining effect on the suspended sediment transport in the Huanghe (Yellow River) Estuary, China

Cited by 21 publications

References 38 publications

Observations of Mud‐Induced Periodic Stratification in a Hyperturbid Estuary

Observations of Mud‐Induced Periodic Stratification in a Hyperturbid Estuary

Suspended sediment transport in the Deepwater Navigation Channel, Yangtze River Estuary, China, in the dry season 2009: 2. Numerical simulations

Suspended sediment transport in the Deepwater Navigation Channel, Yangtze River Estuary, China, in the dry season 2009: 1. Observations over spring and neap tidal cycles

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