A numerical simulation study on the response of tidal asymmetry to estuarine morphologies

Zhou Zeng; Chen Luying; Jiang Chunhai; Chu Ao; Ian Townend; Zhang Changkuan

doi:10.12284/hyxb2022120

Volume 44 Issue 7

Jul. 2022

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Zhou Zeng，Chen Luying，Jiang Chunhai, et al. A numerical simulation study on the response of tidal asymmetry to estuarine morphologies[J]. Haiyang Xuebao，2022, 44(7)：37–46 doi: 10.12284/hyxb2022120

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A numerical simulation study on the response of tidal asymmetry to estuarine morphologies

doi: 10.12284/hyxb2022120

1.
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China
2.
Jiangsu Key Laboratory of Coast Ocean Resources Development and Environment Security, Hohai University, Nanjing 210098, China
3.
Shanghai Engineering Consulting (Group) Co. Ltd., Shanghai 200335, China
4.
School of Ocean and Earth Science, University of Southampton, Southampton SO17 1BJ, UK

Received Date: 2021-08-21
Rev Recd Date: 2022-01-11

Available Online: 2022-07-01

Publish Date: 2022-07-01

Abstract

Abstract

Estuarine morphologies play an important role on tidal asymmetry. A two-dimensional numerical model is established with the Humber Estuary, UK as a reference site. A series of simulations are designed to examine the effects of the estuary cross-section shape, planform and convergence on the development of tidal asymmetry, whilst maintaining the same tidal prism. Model results show that deeper channels result in the lag and enhancement of phase difference whilst shallower channels result in a decline in the maximum ebb-tide velocity and longer period of ebb tide, and the estuary tends to be flood-dominated; narrow tidal flat tends to favour ebb dominance while broad tidal flat tends to favour flood dominance. Flood dominance is strongest in the convergent and long estuary. In addition, narrowing the estuary width will enhance the residual flow velocity of the main channel but weaken the residual flow velocity of the tidal flat. With the increase in estuary convergence, the residual flow velocity of the main channel increases but decreases on the tidal flat, and strengthen the flood dominance of the tidal flat. This paper further improves the research on the influence of estuary landforms on tidal asymmetry, which has certain guiding significance for reclamation and coastal engineering.
- tidal asymmetry,
- estuarine morphology,
- stability relationships,
- tidal flats and channels,
- residual velocity,
- harmonic analysis

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References(46)

References

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