Equilibrium bottom profiles of different embayment configurations

Su Wenliang; Zou Zhili; Zhang Qingmin

doi:10.3969/j.issn.0253-4193.2020.05.012

Volume 42 Issue 5

Nov. 2020

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Su Wenliang，Zou Zhili，Zhang Qingmin. Equilibrium bottom profiles of different embayment configurations [J]. Haiyang Xuebao，2020, 42(5)：128–138，doi:10.3969/j.issn.0253−4193.2020.05.012

Citation:

Su Wenliang，Zou Zhili，Zhang Qingmin. Equilibrium bottom profiles of different embayment configurations [J]. Haiyang Xuebao，2020, 42(5)：128–138，doi:10.3969/j.issn.0253−4193.2020.05.012

Citation:

Su Wenliang，Zou Zhili，Zhang Qingmin. Equilibrium bottom profiles of different embayment configurations [J]. Haiyang Xuebao，2020, 42(5)：128–138，doi:10.3969/j.issn.0253−4193.2020.05.012

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Equilibrium bottom profiles of different embayment configurations

doi: 10.3969/j.issn.0253-4193.2020.05.012

State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China

Received Date: 2017-05-12
Rev Recd Date: 2019-03-05

Available Online: 2020-11-18

Publish Date: 2020-05-25

Abstract

Abstract

Investigating the morphodynamic equilibrium of embayment is important to understand the evolution of coastal morphology. This study investigates the effect of embayment shape on equilibrium bottom profile of the embayment. Three typical embayments, rectangular, convergent and divergent types, are considered to examine their bottom equilibrium profiles analytically and numerically. The approximate analytic solutions for bottom equilibrium profile and mean sand concentration applicable to the three types of the embayments are established for the case of embayment’s length much smaller than tidal wave length. The two-dimensional depth-average model coupling hydrodynamics, sand transformation and bottom evolution is adopted to simulate the embayment equilibrium state of these three types of embayments, and the numerical result of surface elevation is then applied to determine the two parameters contained in the bottom analytic solution. The research results give the three different equilibrium bottom profiles: the plane slope for rectangular embayment; the downward convex form for convergent embayment and the upward concave form for divergent embayment. The good agreements between the theoretical and numerical results of tidal current, sand concentration and bottom profile are achieved.
- embayment,
- equilibrium profile,
- numerical simulation,
- sand concentration

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References(14)

References

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