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Modelling effects of an asphalt road at a dike crest on dike cover erosion onset during wave overtopping

Author

Listed:
  • A. Bomers

    (University of Twente)

  • J. P. Aguilar Lopez

    (University of Twente
    Delft University of Technology)

  • J. J. Warmink

    (University of Twente)

  • S. J. M. H. Hulscher

    (University of Twente)

Abstract

Structures integrated in a grass-covered dike may increase erosion development. Currently, safety assessment methods for flood defences are only applicable for a conventional grass-covered dike and the effects of structures on dike cover erosion are poorly understood. Since many dikes have a road on top, it is important to study the effect of such a road structure on erosion onset during wave overtopping. To investigate this effect, a coupled hydrodynamic–erosion model was developed. The erosion onset caused by overtopping waves was predicted by combining the time-varying bed shear stresses from the hydrodynamic model with a depth-dependent erosion model. The results show that roads on top of a dike increase the erosion of the neighbouring grass cover. This increase in erosion may have a negative impact on dike stability. Therefore, we recommend considering effects of constructions on top of dike profiles during safety assessments. Explicitly, consideration of the roughness transitions in the safety assessments of dikes is recommended.

Suggested Citation

  • 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.
    • Handle: RePEc:spr:nathaz:v:93:y:2018:i:1:d:10.1007_s11069-018-3287-y
    DOI: 10.1007/s11069-018-3287-y
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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. 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.
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    Cited by:

    1. Bingqi Li & Zhenyu Zhang & Xiaogang Wang & Xiaonan Liu, 2019. "Investigation on the Debonding Failure Model of Anchored Polyurea Coating under a High-Velocity Water Flow and Its Application," Sustainability, MDPI, vol. 11(5), pages 1-22, February.

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