Dynamics of the extension of the Yellow River plume in the Bohai Sea

Cheng, Xinyue; Zhu, Jianrong; Chen, Shenliang

doi:10.1016/j.csr.2021.104438

Cited by 9 publications

(9 citation statements)

References 66 publications

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“…The model has been well calibrated and verified many times for elevation, current velocity and salinity in previous studies (Cheng et al, 2021a;2021b). This study further validated the model with current, salinity, SSC and wave for SWAN model.…”

Section: Model Validationsupporting

confidence: 67%

“…However, the velocities are much smaller than surface layer, with values lower than 1 m/s. The strong landward surface currents induce an upwelling at about 28 km away from the coast and a downwelling at 10 km away from the coast, which is suggested to be the result of the convergence and divergence of Ekman transport in the bottom boundary layer during the trapping of the river plume front (Chapman and Lentz, 1994;Cheng et al, 2021a;Wu and Wu, 2018). As for the cross-section currents, the residual water flows downstream within 8 km away from the coast with the velocities of larger than 6 cm/s.…”

Section: Resultsmentioning

confidence: 99%

“…The Bohai Sea is a shallow semi-enclosed marginal sea in West Pacific, and the only inner Sea in China (Figure 1). The Bohai Sea receives about 1.5 × 10 10 m 3 freshwater and 6.9 × 10 8 t sediment annually from the Yellow River (Cheng et al, 2021a), the second largest river in China, which is famous for its high sediment concentration. The water and sediment discharge of the Yellow River varies seasonally.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Tide and Wave on the Transport of Water and Sediments off the Yellow River Mouth in Winter

Cheng¹,

Zhu

Chen

2023

Preprint

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The fresh water and sediments transport from the Yellow River mouth downstream along the coast into the Laizhou Bay under the northeasterly wind in winter. The sediment transport is convergence in the river mouth, divergence in the downstream area, and convergence in the north of Laizhou Bay. Tide and wave are the two main forcings affecting the transport of water and sediments off river mouths. For the high-turbidity Yellow River mouth and the adjacent sea, tidal forcing enhances the subtidal downstream transport of water and sediments off the river mouth into the Laizhou Bay, whereas wave forcing has little effect on the advection of water and sediments. The sediment resuspension is controlled by the bottom shear stress induced by tide and wave. The tide-induced bottom shear stress is higher in the north of Laizhou Bay and south of Bohai Bay due to the stronger bottom tidal current. The wave-induced bottom shear stress plays a more important role in sediment resuspension, which is higher in the nearshore region along the Yellow River Delta away from the coast to some extent on account of the maximum near-bottom wave orbital velocity. Tidal mixing strengthens the upward diffusion of bottom suspended sediments. Without tidal forcing, the decreased bottom shear stress suspends less sediment above bed. On the other hand, the enhanced stratification hinders the upward diffusion of the bottom sediment due to the lack of tidal mixing, resulting in higher suspended sediment concentration (SSC) in the bottom layer in the offshore region.

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Section: Model Validationsupporting

confidence: 67%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Tide and Wave on the Transport of Water and Sediments off the Yellow River Mouth in Winter

Cheng¹,

Zhu

Chen

2023

Preprint

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“…These phys ical factors can affect hydrodynamics in the Bohai Sea. For example, water temperature and salinity can affect the density of the water and further affect the circulation and mixing of water masses [32,44,66]. Density differences create vertical stratification, which affects the horizontal movement of water.…”

Section: Model Limitations and Future Workmentioning

confidence: 99%

Impacts of Riverine Floods on Morphodynamics in the Yellow River Delta

Bellerby

et al. 2023

Water

Self Cite

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The geomorphological stability and ecological environment of megadeltas worldwide are of vital importance for their sustainable development. Deltaic hydro-morphodynamics is extremely sensitive to high riverine flow due to reduced sediment supply. However, the morphological evolution and response of deltas under high riverine flow have remained inadequately quantified. As one of the typical megadeltas, the Yellow River Delta (YRD), is becoming increasingly sensitive to environmental changes and intensified human interventions. In this study, a numerical model and field data were used to investigate the hydrodynamic changes and morphodynamic evolution induced by extreme river discharge in the YRD. The numerical experiments with different runoff scenarios reveal that high-energy riverine floods can cause significant hydrodynamic changes in bed shear stresses, water levels, and flow velocities, particularly in the abandoned river mouth. Moreover, it enhances the ebb-dominated tidal asymmetry, which considerably intensifies fluvial sediment resuspension and transport processes. The results also show high-energy riverine floods in the flood seasons trigger severe erosion in the Yellow River submerged delta, with a net erosion volume reaching −0.07 × 108 m3/yr. The hydrodynamic increment in the abandoned river mouth is more significant, and therefore, severe erosion occurs, with the maximum erosion thickness reaching 7 m. These findings highlight the role of high riverine floods on the hydro-sediment dynamics of large river deltas under a sediment starvation condition.

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“…While the effects of WSRS on the sediment transport and morphodynamics in the YRD have been well documented using field data from integrated hydrographic surveys (Bi et al., 2010; Wang et al., 2017; Wu et al., 2015), modeling studies with respect to the morphological evolutions of the YRD in response to WSRS are relatively rare. Most existing modeling studies focused on seasonal variations of the plume structures (Cheng et al., 2021), or large‐scale sediment transport and dispersal patterns (Bian et al., 2013; Ji et al., 2020, 2022; Lu et al., 2011), rather than short‐term morphological responses to the impulsive river floods by the WSRS.…”

Section: Introductionmentioning

confidence: 99%

Modeling the Morphological Responses of the Yellow River Delta to the Water‐Sediment Regulation Scheme: The Role of Impulsive River Floods and Density‐Driven Flows

Wang

Liang

et al. 2023

Water Resources Research

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Morphological evolution of river deltas depends to a large extent on river discharges, which are usually highly unsteady due to natural hydrological cycles and anthropogenic regulations. However, it is unclear that how and to what extent the discharge fluctuations influence the delta morphology. In this study, we focus on the morphological response of the Yellow River Delta to the Water‐Sediment Regulation Schemes, which generate impulsive floods and deliver high sediment load within a short time. Tracking the fate of fluvial sediment released by 10 historical events reveals that 51.3%, 19.7%, and 17.8% of fluvial sediment are deposited in the delta front, the subaerial delta and the prodelta, respectively. Hypopycnal and hyperpycnal flows occur alternately during different phases of the regulation schemes, and the latter contribute to 32% of the deposition volume with 10% of the duration. To explore the effects of river discharge schematizations on delta evolution, numerical experiments are conducted to compare models forced by unsteady and constant discharges, with the latter being a common practice in delta morphology modeling. We show that the constant‐discharge simplification fails to capture the highly‐depositional hyperpycnal flows, leading to dramatic underestimation of river mouth depositions. In addition, we demonstrate that including the 3D flow‐sediment interactions are critical in reproducing the correct plume structures, bed surface sediment compositions and deposition patterns. Our study highlights the importance of proper river discharge schematizations and full consideration of flow‐sediment interactions in modeling deltas affected by episodic river floods and high suspended sediment concentrations.

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Dynamics of the extension of the Yellow River plume in the Bohai Sea

Cited by 9 publications

References 66 publications

Effects of Tide and Wave on the Transport of Water and Sediments off the Yellow River Mouth in Winter

Effects of Tide and Wave on the Transport of Water and Sediments off the Yellow River Mouth in Winter

Impacts of Riverine Floods on Morphodynamics in the Yellow River Delta

Modeling the Morphological Responses of the Yellow River Delta to the Water‐Sediment Regulation Scheme: The Role of Impulsive River Floods and Density‐Driven Flows

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