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Damage to grass dikes due to wave overtopping

Author

Listed:
  • Hai Trung Le

    (Water Resources University)

  • H. J. Verhagen

    (Delft University of Technology)

  • J. K. Vrijling

    (Delft University of Technology)

Abstract

Grass covers have been applied as an effective measure for protecting river levees and sea dikes. We conducted experiments to show how roots considerably improve the shear strength of soil on dike slopes. Roots of 1-year-old Bermuda and Carpet grass may increase the total shear strength of up to 20 kPa. Exposed to severe overtopping flow, dike slopes may possibly fail in various manners including ‘head-cut’, ‘roll-up’ and ‘collapse’. The ratio between shear strength of the grass cover and its subsoil layer would get a value of two to distinguish the first two manners and would be zero for the last one. To some extent, the findings contribute to the basis for thoughtfully investigating the strength and failure mechanism of grass-covered slopes.

Suggested Citation

  • Hai Trung Le & H. J. Verhagen & J. K. Vrijling, 2017. "Damage to grass dikes due to wave overtopping," 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. 86(2), pages 849-875, March.
    • Handle: RePEc:spr:nathaz:v:86:y:2017:i:2:d:10.1007_s11069-016-2721-2
    DOI: 10.1007/s11069-016-2721-2
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    References listed on IDEAS

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    1. Tuan Thieu Quang & Hocine Oumeraci, 2012. "Numerical modelling of wave overtopping-induced erosion of grassed inner sea-dike slopes," 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. 63(2), pages 417-447, September.
    2. Grzegorz Stanczak & Hocine Oumeraci, 2012. "Model for prediction of sea dike breaching initiated by breaking wave impact," 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. 61(2), pages 673-687, March.
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    Cited by:

    1. A. Bomers & J. P. Aguilar Lopez & J. J. Warmink & S. J. M. H. Hulscher, 2018. "Modelling effects of an asphalt road at a dike crest on dike cover erosion onset during wave overtopping," 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. 93(1), pages 1-30, August.

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