Study on Closure Depth of Cross-Shore Sediment Transport in Haizhou Bay, a Mesotidal Embayment

Zhu Wenjin; Tang Xia; Dong Xiaotian; Mo Chunyan; ZhangYang

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Zhu Wenjin，Tang Xia，Dong Xiaotian, et al. Study on Closure Depth of Cross-Shore Sediment Transport in Haizhou Bay, a Mesotidal Embayment[J]. Haiyang Xuebao，2026, 48(x)：1–13

Citation:

Zhu Wenjin，Tang Xia，Dong Xiaotian, et al. Study on Closure Depth of Cross-Shore Sediment Transport in Haizhou Bay, a Mesotidal Embayment[J]. Haiyang Xuebao，2026, 48(x)：1–13

Citation:

Zhu Wenjin，Tang Xia，Dong Xiaotian, et al. Study on Closure Depth of Cross-Shore Sediment Transport in Haizhou Bay, a Mesotidal Embayment[J]. Haiyang Xuebao，2026, 48(x)：1–13

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Study on Closure Depth of Cross-Shore Sediment Transport in Haizhou Bay, a Mesotidal Embayment

School of Civil and Ocean Engineering, Jiangsu Ocean University, Lianyungang 222005, China

Received Date: 2026-03-08
Rev Recd Date: 2026-04-10

Available Online: 2026-05-11

Abstract

Abstract

The depth of closure is a key parameter in studies of sediment budget balance and coastal morphodynamics, and plays an important role in coastal erosion-related engineering applications. Traditional methods for estimating the depth of closure are mostly developed for wave-dominated coasts and generally neglect the influence of tidal currents, which limits their applicability to mesotidal embayments. Taking Haizhou Bay in the Lianyungang coastal area as a case study, this study systematically investigates the influence of tidal currents on the depth of closure by integrating field observations, numerical simulations, and theoretical analysis. The numerical results indicate that tidal currents in Haizhou Bay exhibit a decreasing trend from north to south, and that tidal forcing significantly enhances nearshore sediment mobilization. Under combined wave-current conditions, the depth of closure is estimated to range from 8.0 to 10.1 m, representing an increase of 0.4−1.3 m compared with the wave-only condition. Comparisons with historical bathymetric charts suggest that the observed depth of closure in Haizhou Bay generally falls within the range of 8.9−9.8 m, which is in good agreement with the results obtained in this study, further demonstrating the reliability of the proposed approach. The new method highlights the role of tidal currents in increasing bed shear stress in mesotidal embayments and explicitly accounts for their influence on the depth of closure, providing a sound scientific basis and technical support for coastal engineering applications in similar environments.
- Haizhou Bay,
- Depth of closure,
- Incipient motion depth,
- Numerical simulation,
- Current influence

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References(37)

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