Numerical simulation on the impact of mangroves on wave pressure on vertical sea dikes

Lei Jiaxin; Zhang Rong; Chen Yongping; Wang Yuan; Yao Peng

doi:10.12284/hyxb2024011

Volume 46 Issue 2

May 2024

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Lei Jiaxin，Zhang Rong，Chen Yongping, et al. Numerical simulation on the impact of mangroves on wave pressure on vertical sea dikes[J]. Haiyang Xuebao，2024, 46(2)：117–130 doi: 10.12284/hyxb2024011

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Numerical simulation on the impact of mangroves on wave pressure on vertical sea dikes

doi: 10.12284/hyxb2024011

Lei Jiaxin^{1, 2
,},
Zhang Rong^{1, 2},
Chen Yongping^{1, 2
,
,},
Wang Yuan^{1, 2},
Yao Peng^{1, 2}

1.
The National Key Laboratory of Water Disaster Prevention, Hohai University, Nanjing 210098 China
2.
College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing 210098 China

Received Date: 2023-11-12
Rev Recd Date: 2024-01-08

Available Online: 2024-03-04

Publish Date: 2024-05-29

Abstract

Abstract

Based on the non-hydrostatic model SWASH, a numerical wave flume was established to systematically investigate the hydrodynamic characteristics of the interaction between waves, mangroves, and vertical sea dikes through a comparative experiment with and without mangroves. The study analyzed the influence of factors such as wave steepness, relative water depth, Ursell number, mangrove length, density, and characteristic diameter on the wave height in front of the sea dike and the maximum wave pressure on the windward side of the sea dike. The results indicate that in the absence of mangroves, the Goda formula cannot accurately estimate the impact load on the vertical sea dike. In a numerical experiment with a model scale of 1∶10, a 2 m-wide mangrove in front of the dike was observed to reduce wave height by 6% to 45% and wave pressure by 11% to 74%. However, in conditions with relatively large wave heights and smaller characteristic parameters of the mangrove, an increase in the wave height in front of the dike by approximately 4% to 26% was noted. In the hydraulic conditions considered in this study, the maximum wave pressure decreased by 58% to 93% with a decrease in wave steepness, by 42% to 72% with an increase in relative water depth, and by 87% to 96% with a decrease in the Ursell number. The attenuation rates of wave height and wave pressure in front of the dike non-linearly increased with the increase in the width, density, and characteristic diameter of the mangroves. These findings provide a scientific basis for a deeper understanding of the wave-damping effects of mangroves, as well as for the design and planning of coastal protection projects combining mangrove ecosystems with sea dikes.
- mangroves,
- vertical sea dike,
- wave pressure,
- numerical simulation

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References(44)

References

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