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Laboratory study on tsunami erosion and deposition under protection of rigid emergent vegetation

Author

Listed:
  • Jie Chen

    (Changsha University of Science and Technology
    Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province
    Changsha University of Science and Technology)

  • Zihao Duan

    (Changsha University of Science and Technology)

  • Changbo Jiang

    (Changsha University of Science and Technology
    Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province
    Changsha University of Science and Technology)

  • Zhe Guan

    (Changsha University of Science and Technology)

Abstract

Devastating tsunami waves can change the coastal morphology considerably. The effects of vegetation to coastal morphodynamics have been of primary interest for decades, because of their role in coastal protection and ecological environment. The damping of wave and impact of beach evolution are the two significant contributions on emerged vegetation. However, the laboratory study of tsunami erosion and deposition under protection of coastal vegetation was less understood compared to tsunami run-up and tsunami inundation. A set of laboratory experiments were reported in this study on changes of size-selective sandy beach profile under the protection of rigid emergent vegetation. The total of fifteen experiments was carried out in a wave flume including two initial profiles (with vegetation and none vegetation), three different wave conditions and four forest densities. The experiments show that rigid emergent vegetation changes the depth and location of tsunami deposition and erosion in sandy beach. The dimensionless numbers were derived to characterize the cross-shore beach profile response under the protection of rigid emergent vegetation. These parameters were written as a dimensionless group, and based upon this present experimental datum, the empirical equations were developed. The study reveals the internal connection among tsunami deposition and erosion, wave height and forest density. The findings of this study have the potential to assist the tsunami hazards prevention and mitigation.

Suggested Citation

  • Jie Chen & Zihao Duan & Changbo Jiang & Zhe Guan, 2018. "Laboratory study on tsunami erosion and deposition under protection of rigid emergent vegetation," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 92(2), pages 995-1010, June.
  • Handle: RePEc:spr:nathaz:v:92:y:2018:i:2:d:10.1007_s11069-018-3235-x
    DOI: 10.1007/s11069-018-3235-x
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    References listed on IDEAS

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    1. Jie Chen & Changbo Jiang & Wu Yang & Guizhen Xiao, 2016. "Laboratory study on protection of tsunami-induced scour by offshore breakwaters," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 81(2), pages 1229-1247, March.
    2. Jie Chen & Zhenhua Huang & Changbo Jiang & Bin Deng & Yuannan Long, 2013. "Tsunami-induced scour at coastal roadways: a laboratory study," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 69(1), pages 655-674, October.
    3. Jie Chen & Changbo Jiang & Wu Yang & Guizhen Xiao, 2016. "Laboratory study on protection of tsunami-induced scour by offshore breakwaters," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 81(2), pages 1229-1247, March.
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    Cited by:

    1. Nikita Jain & Deepali Virmani & Ajith Abraham, 2021. "Tsunami in the last 15 years: a bibliometric analysis with a detailed overview and future directions," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 106(1), pages 139-172, March.

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