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We performed a 1:2 scale experiment investigating the performance of green (mangrove), grey (revetment), and hybrid green-grey (mangrove + revetment) systems in mitigating wave overtopping. Six configurations were tested under irregular, regular, and transient (tsunami-like) wave conditions. This paper focuses on the performance of the systems under transient wave conditions, with amplitudes between 0.113 m and 0.228 m and rise times between 4.18 s and 15.40 s. Results indicated that while the conventional (revetment only) configuration reduced total overtopping volumes compared to the baseline (wall-only configuration) by 6% to 30%, the mangrove-only configurations reduced overtopping significantly (by 25% to 54%). Hybrid mangrove + revetment configurations produced the greatest reduction in overtopping, with overtopping reductions of 44% to 83% compared to the baseline configuration. These results show the potential for nature-based and hybrid solutions to provide similar engineering benefits as conventional systems to mitigate future coastal flood hazards.

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Green, Grey, or Both? Mangroves, Revetments, and Hybrid Systems to Mitigate Wave Overtopping

  • 会议论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年

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  • Tori Tomiczek,
  • Margaret Libby,
  • Daniel T. Cox,
  • Pedro Lomónaco

摘要

We performed a 1:2 scale experiment investigating the performance of green (mangrove), grey (revetment), and hybrid green-grey (mangrove + revetment) systems in mitigating wave overtopping. Six configurations were tested under irregular, regular, and transient (tsunami-like) wave conditions. This paper focuses on the performance of the systems under transient wave conditions, with amplitudes between 0.113 m and 0.228 m and rise times between 4.18 s and 15.40 s. Results indicated that while the conventional (revetment only) configuration reduced total overtopping volumes compared to the baseline (wall-only configuration) by 6% to 30%, the mangrove-only configurations reduced overtopping significantly (by 25% to 54%). Hybrid mangrove + revetment configurations produced the greatest reduction in overtopping, with overtopping reductions of 44% to 83% compared to the baseline configuration. These results show the potential for nature-based and hybrid solutions to provide similar engineering benefits as conventional systems to mitigate future coastal flood hazards.