Numerical simulation of hydrodynamic and sediment transport and analysis of geomorphic erosion and deposition in the Taiwan Strait

Zhong Hao; Zhou Jieqiong; Wu Ziyin; Zhao Dineng; Cao Zhenyi; Zhu Chao

doi:10.12284/hyxb2024041

Volume 46 Issue 4

Jun. 2024

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Article Navigation > Haiyang Xuebao > 2024 > 46(4): 90-105

Zhong Hao，Zhou Jieqiong，Wu Ziyin, et al. Numerical simulation of hydrodynamic and sediment transport and analysis of geomorphic erosion and deposition in the Taiwan Strait[J]. Haiyang Xuebao，2024, 46(4)：90–105 doi: 10.12284/hyxb2024041

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Numerical simulation of hydrodynamic and sediment transport and analysis of geomorphic erosion and deposition in the Taiwan Strait

doi: 10.12284/hyxb2024041

Zhong Hao^1
,,
Zhou Jieqiong^{1, 2
,
,},
Wu Ziyin^{1, 2, 3},
Zhao Dineng^{1, 2},
Cao Zhenyi^{1, 4},
Zhu Chao³

1.
The Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
2.
Key Laboratory of Submarine Science, Ministry of Natural Resources, Hangzhou 310012, China
3.
School of Oceanography, Shanghai Jiao Tong University, Shanghai 200030, China
4.
State Key Laboratory of Satellite Ocean Environment Dynamics, Hangzhou 310012, China

Received Date: 2023-12-17
Rev Recd Date: 2024-03-27

Available Online: 2024-05-11

Publish Date: 2024-06-30

Abstract

Abstract

Taiwan Strait is the largest strait in China and the main channel for material and energy exchange between the East China Sea and the South China Sea. The topography changes dramatically and the tidal environment is complex in the Strait. In addition, many mountainous streams on both sides carry a large amount of sediment into the strait. It is an ideal place to study dynamic sedimentation processes. Currently, due to a lack of high-resolution bathymetry and relevant data for the entire Taiwan Strait, there are few studies on modeling the tide and sediment behaviors of the Taiwan Strait as a whole. In this study, based on high-resolution bathymetric and relevant hydrological data, a two-dimensional tidal current numerical model of the Taiwan Strait has been established, and a sediment transport module has been coupled to simulate the sediment transport in the Taiwan Strait. The dynamic simulation results indicate that the tidal current field in the Taiwan Strait is governed by two tidal waves from the south and north, exhibiting distinct temporal and spatial characteristics. The tidal flow velocity is higher in summer than in winter, and it is lower in the central part of the strait compared to the southern and northern sides, with the northern side being less than the southern side. Based on the deposition and erosion simulation results, the Taiwan Strait is categorized into three main types and a total of seven sedimentary subdivisions: deposition zones, erosion zones, and deposition-erosion equilibrium zones. The maximum sedimentation rate in the accumulation zones can reach 5 cm/a, primarily concentrated in the northern part of the Taiwan Bank, with erosion rates ranging from 2 cm/a to 5 cm/a in the erosion zones. Leveraging these simulation outcomes, this study constructs a sediment transport model and a ‘source-to-sink’ pattern model for the Taiwan Strait, elucidating the dynamic mechanisms behind the strait’s deposition and erosion changes and the ‘source-to-sink’ process.
- Taiwan Strait,
- numerical simulation,
- hydrodynamics,
- sediment transport,
- geomorphological evolution

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References(58)

References

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