The influence of vortex flow generated by spur dikes on the distribution and mixing of dissolved oxygen at a wide-shallow confluence DOI
Xia Shen, Dehong Li,

Liwei Cao

et al.

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(10)

Published: Oct. 1, 2024

The inflow of heavy polluted tributaries is one the main factors that destroy water quality at river confluence area and downstream, especially in wide-shallow area. In this study, a generalized model two-dimensional was established validated, dissolved oxygen concentration used as indicator. influence laws mechanisms different spur dike layout patterns on distribution characteristics transport mixing processes were explored through numerical simulation. results show there large pollution with tributary, which distributed near outlet recovers slowly. flow ratio factor affecting confluence. Arranging dikes opposite bank tributary can significantly reduce by adjusting field. side effectively promote vortex suction between improve bank. showed an increasing trend along direction, velocity decreasing trend, increment had good linear correlation interval change dikes.

Language: Английский

Hydrodynamic Response of Channel Flow Confluence to the Tributary Floodplain Topography DOI Creative Commons

Guanghui Yan,

Saiyu Yuan, Hongwu Tang

et al.

Water Resources Research, Journal Year: 2024, Volume and Issue: 60(8)

Published: Aug. 1, 2024

Abstract River confluences with a compound‐channel tributary are common in large river networks, for example, the Yangtze basin and Amazon basin. They affect confluence hydrodynamics, nutrient depletion fish migration network, due to seasonal exposure submergence of floodplain. The corresponding influencing mechanisms critical but poorly understood. This study investigated hydrodynamic response channel flow floodplain, that is, various widths heights Two kinds secondary circulations were identified: One was streamline curvature, other produced by separation floodplain step. An increase size enhanced strength circulation compound channel, it disappeared near junction because effects main channel. decreased cross‐sectional area amplified momentum, resulting larger zone tributary‐side wall. floodplain‐induced increased as width increased, moved toward bank destroying zone. Moreover, strong upwelling caused rising water surface zone, which supposed be region falling energy loss negative pressure. A conceptual model proposed summarize hydrodynamics different topography. Our results provided comprehensive knowledge have important implication flood management ecological restoration

Language: Английский

Citations

3
River confluences: a review of recent field and numerical studies DOI
George Constantinescu, Carlo Gualtieri

Environmental Fluid Mechanics, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 9, 2024

Language: Английский

Citations

3
Mechanisms of influence of confluence containing spur-dike on microplastic transport and fate DOI

Liwei Cao,

Xia Shen, Huanjie Cai

et al.

Journal of Hydrology, Journal Year: 2024, Volume and Issue: 641, P. 131720 - 131720

Published: July 31, 2024

Language: Английский

Citations

1
The influence of vortex flow generated by spur dikes on the distribution and mixing of dissolved oxygen at a wide-shallow confluence DOI
Xia Shen, Dehong Li,

Liwei Cao

et al.

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(10)

Published: Oct. 1, 2024

The inflow of heavy polluted tributaries is one the main factors that destroy water quality at river confluence area and downstream, especially in wide-shallow area. In this study, a generalized model two-dimensional was established validated, dissolved oxygen concentration used as indicator. influence laws mechanisms different spur dike layout patterns on distribution characteristics transport mixing processes were explored through numerical simulation. results show there large pollution with tributary, which distributed near outlet recovers slowly. flow ratio factor affecting confluence. Arranging dikes opposite bank tributary can significantly reduce by adjusting field. side effectively promote vortex suction between improve bank. showed an increasing trend along direction, velocity decreasing trend, increment had good linear correlation interval change dikes.

Language: Английский

Citations

0