Hydrodynamics, Sediment Transport and Morphological Features at the Confluence Between the Yangtze River and the Poyang Lake

Yuan, Saiyu; Tang, Hongwu; Li, Kun; Xu, Lei; Xiao, Yang; Gualtieri, Carlo; Rennie, Colin D.; Melville, Bruce W.

doi:10.1029/2020wr028284

Cited by 100 publications

(46 citation statements)

References 90 publications

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“…In general, bank retreat controls the equilibrium river width by eventually reducing the shear stress on the banks to a critical threshold value (Francalanci et al., 2020; K. B. J. Dunne & Jerolmack, 2020). From the perspective of cross‐sectional evolution, bank retreat is responsible for the instantaneous adjustment of the bank line (C. Hackney et al., 2015; Darby et al., 2007), which modulates near‐bank hydrodynamics and, together with the transverse transport of sediment driven by secondary flow circulations which establish in meandering bends (Bolla Pittaluga & Seminara, 2011), gradually shift the thalweg from one bank to the other (Fryirs & Brierley, 2012; Parker et al., 2011; Stecca et al., 2017; Yuan et al., 2021). In various settings, bank‐derived materials have been reported as the dominant factor of sediment budgets (Kronvang et al., 2013; Trimble, 2009).…”

Section: Feedbacks Between Bank Retreat and Morphodynamicsmentioning

confidence: 99%

A Review on Bank Retreat: Mechanisms, Observations, and Modeling

Zhao

Coco

Gong

et al. 2022

Reviews of Geophysics

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Bank retreat plays a fundamental role in fluvial and estuarine dynamics. It affects the cross‐sectional evolution of channels, provides a source of sediment, and modulates the diversity of habitats. Understanding and predicting the geomorphological response of fluvial/tidal channels to external driving forces underpins the robust management of water courses and the protection of wetlands. Here, we review bank retreat with respect to mechanisms, observations, and modeling, covering both rivers and (previously neglected) tidal channels. Our review encompasses both experimental and in situ observations of failure mechanisms and bank retreat rates, modeling approaches and numerical methods to simulate bank erosion. We identify that external forces, despite their distinct characteristics, may have similar effects on bank stability in both river and tidal channels, leading to the same failure mode. We review existing data and empirical functions for bank retreat rate across a range of spatial and temporal scales, and highlight the necessity to account for both hydraulic and geotechnical controls. Based on time scale considerations, we propose a new hierarchy of modeling styles that accounts for bank retreat, leading to clear recommendations for enhancing existing modeling approaches. Finally, we discuss systematically the feedbacks between bank retreat and morphodynamics, and suggest that to move this agenda forward will require a better understanding of multifactor‐driven bank retreat across a range of temporal scales, with particular attention to the differences (and similarities) between riverine and estuarine environments, and the role of feedbacks exerted by the collapsed bank soil.

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Section: Feedbacks Between Bank Retreat and Morphodynamicsmentioning

confidence: 99%

A Review on Bank Retreat: Mechanisms, Observations, and Modeling

Zhao

Coco

Gong

et al. 2022

Reviews of Geophysics

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“…As confluências fluviais produzem alterações significativas na hidrodinâmica e morfologia do leito em função do ajuste dos dois fluxos a geometria local e pós confluência (Yuan et al, 2021). A junção dos canais desencadeia anomalias dos padrões de circulação do fluxo e sedimentos no curso fluvial.…”

Section: Distribuição De Fluxo E Morfologia Em Confluência Fluvial Rochosa De âNgulo Obtusounclassified

“…A junção dos fluxos produz o poço de escavação, denominado scour hole. Yuan et al (2021) associaram a área de maior entalhamento do leito aos movimentos helicoidais do fluxo. No caso da junção do Rio das Pedras, apesar da erosão de leito no encontro dos fluxos, a maior incisão do substrato ocorre entre 80 a 140 metros da junção, constituindo um remanso no fluxo, com incisão de até cinco metros de profundidade (Figura 12).…”

Section: Distribuição De Fluxo E Morfologia Em Confluência Fluvial Rochosa De âNgulo Obtusounclassified

“…As áreas de confluências de rios são pontos específicos na paisagem que refletem aspectos do ambiente de toda bacia hidrográfica, caracterizadas por Yuan et al (2021) como nós críticos da rede de drenagem. As confluências de canais fluviais são tratadas na literatura como ambientes sensíveis e importantes pelo controle e redirecionamento de fluxo e sedimentação.…”

Section: Introductionunclassified

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Hidrogeomorfologia em confluência fluvial obtusa, Guarapuava, Paraná

Vestena

Kominecki

2021

Rev. Bras. Geog. Fis.

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Solid and liquid mixtures in river courses intensify in areas of river confluence, conditioned mainly by the angular opening of the junction. Knowledge of hydrosedimentological dynamics in bedrock junctions with different angular openings is essential for understanding morphological adjustment at confluences and for supporting actions for the preservation and conservation of river ecosystems. For this reason, this article presents the results of a hydrogeomorphologic study on a river confluence with an obtuse junction angle (>100º), in a plateau bedrock river, in the Serra Geral Formation. The research evaluated a fluvial segment upstream and downstream of the Pedras River and in the Pombas River tributary, in Guarapuava, Paraná, through observations and measurements of morphological and hydraulic characteristics, width, talweg depth, bed declivity and bankfull flow. Morphological adjustment in obtuse confluences is peculiar in that the fluvial junction angle conditions specific flow, erosion, sediment transport and deposition dynamics, mainly resulting from its association with the geological nature of the river bed and types of land use and management upstream of the confluence.

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“…Gualtieri et al [19] demonstrated that the momentum transfers and the mixing interface width in the confluence hydrodynamic zone depend on the flow conditions. Yuan et al [20] conducted analysis of the helical motion in confluences and found that flow structures originating from circular cells affect sediment transport. Other researchers have conducted numerical simulations using the Reynolds-Averaged Navier-Stokes (RANS) model to analyze 3D flow characteristics based on field measurements and laboratory experiments [21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Storage Effects in the Recirculation Zone Based on the Junction Angle of Channel Confluence

2021

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In this study, numerical simulations using the Environmental Fluid Dynamics Code model were conducted to elucidate the effects of flow structures in the recirculation zone on solute storage based on the junction angle. Numerical simulations were performed at a junction angle of 30° to 90° with a momentum flux ratio of 1.62. The simulation results revealed that an increase in the junction angle caused the recirculation zone length and width to increase and strengthened the development of helical motion. The helical motion increased the vertical gradient of the mixing layer and the mixing metric of the dosage curves. The recirculation zone accumulated the solute as a storage zone, which formed a long tail in the concentration curves. The interaction between the helical motion and recirculation zone affected the transverse mixing, such that the transverse dispersion had a positive relationship with the helical motion intensity and a negative relationship with the recirculation zone size. Transverse mixing exhibited an inverse relationship with the mass exchange rate of the recirculation zone. These results indicate that the transverse dispersion is replaced by mixing due to strongly developed storage zones.

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Hydrodynamics, Sediment Transport and Morphological Features at the Confluence Between the Yangtze River and the Poyang Lake

Cited by 100 publications

References 90 publications

A Review on Bank Retreat: Mechanisms, Observations, and Modeling

A Review on Bank Retreat: Mechanisms, Observations, and Modeling

Hidrogeomorfologia em confluência fluvial obtusa, Guarapuava, Paraná

Analysis of Storage Effects in the Recirculation Zone Based on the Junction Angle of Channel Confluence

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