A numerical investigation on wave height and wave setup of irregular wave propagation at the reef flat with porous media

He Dongbin; Ma Yuxiang; Dong Guohai

doi:10.12284/hyxb2022182

Volume 44 Issue 10

Oct. 2022

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He Dongbin，Ma Yuxiang，Dong Guohai. A numerical investigation on wave height and wave setup of irregular wave propagation at the reef flat with porous media[J]. Haiyang Xuebao，2022, 44(10)：163–172 doi: 10.12284/hyxb2022182

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A numerical investigation on wave height and wave setup of irregular wave propagation at the reef flat with porous media

doi: 10.12284/hyxb2022182

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

Received Date: 2021-08-17
Rev Recd Date: 2022-06-09

Available Online: 2022-07-05

Publish Date: 2022-10-01

Abstract

Abstract

A three-dimensional non-hydrostatic model based on volumed-averaged, Reynolds-averaged Navier-Stokes (VARANS) equations in sigma coordinate, is applied to simulate the propagation process of irregular wave over a typical fringing coral reef profile, with emphasis on the changes of wave height and wave setup on the reef flat. Compared with the laboratory measured data of several groups of wave and water level parameters, the model is shown to be capable of simulating well the wave transformation over the reef profile with and without porous media. Across all cases, the porous cases decrease the wave height by 12% around the breaking point, and by 28% on the reef flat than the smooth cases. As for the mean water level, the results show that the maximum setdown decreases by 43% on average for the porous cases than the smooth cases, while the wave setup on the reef flat for corresponding porous and smooth simulations is found to agree with an average difference of only 6%. In addition, the variation of porosity in the range 0.47−0.87 auses little effect on the wave setup.
- non-hydrostatic model,
- porous media,
- reef profile,
- wave setup

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References(32)

References

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