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Estimating tsunami run-up

Author

Listed:
  • G. M. Smart

    (National Institute for Water and Atmospheric Research Ltd (NIWA))

  • K. H. M. Crowley

    (National Institute for Water and Atmospheric Research Ltd (NIWA))

  • E. M. Lane

    (National Institute for Water and Atmospheric Research Ltd (NIWA))

Abstract

Tsunami risk reduction activities rely on a sound knowledge of the hazard characteristics. Our understanding of these characteristics is derived from empirical measurements, numerical models or established rules. Conventional methods used to delineate areas vulnerable to tsunami inundation are often calculated from estimated maximum wave height at the coast and “rules-of-thumb”. Applying such rules may give unreliable results for decision-makers. Using basic hydraulic principles and assumptions, this paper improves on the existing rules by developing and testing new equations for predicting tsunami maximum depth profiles and inundation distances. The proposed equations require knowledge of shoreline wave-crest level, the onshore ground profile and an index for onshore roughness (a ratio of distance between protrusions to a local friction factor). As a tsunami wave moves inland, the equations demonstrate that there will usually be an exponential decline in peak water depth. The equations also confirm that a smaller spacing between onshore roughness elements, such as trees or houses, will give a steeper decline in peak depth due to increased friction as a wave moves inland. Furthermore, where ground level is rising faster than friction head is being lost, it is predicted that the water level of a tsunami will rise above the shoreline wave-crest level. The ground slope at which run-up starts to exceed shoreline wave-crest level can be predicted from the shoreline wave-crest level and roughness spacing. Results predicted by the new equations are verified by comparison with tsunami run-up measurements made in Samoa and Java.

Suggested Citation

  • G. M. Smart & K. H. M. Crowley & E. M. Lane, 2016. "Estimating tsunami run-up," 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. 80(3), pages 1933-1947, February.
  • Handle: RePEc:spr:nathaz:v:80:y:2016:i:3:d:10.1007_s11069-015-2052-8
    DOI: 10.1007/s11069-015-2052-8
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    References listed on IDEAS

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    1. Hiroaki Sato & Hitoshi Murakami & Yasunori Kozuki & Naoaki Yamamoto, 2003. "Study on a Simplified Method of Tsunami Risk Assessment," 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. 29(3), pages 325-340, July.
    2. Roelof Schuiling & Richard Cathcart & Viorel Badescu & Dragos Isvoranu & Efim Pelinovsky, 2007. "Asteroid impact in the Black Sea. Death by drowning or asphyxiation?," 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. 40(2), pages 327-338, February.
    3. Stuart Fraser & William Power & Xiaoming Wang & Laura Wallace & Christof Mueller & David Johnston, 2014. "Tsunami inundation in Napier, New Zealand, due to local earthquake sources," 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. 70(1), pages 415-445, January.
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    Cited by:

    1. Weiwei Jiang & Jingshan Yu, 2022. "Impact of rainstorm patterns on the urban flood process superimposed by flash floods and urban waterlogging based on a coupled hydrologic–hydraulic model: a case study in a coastal mountainous river b," 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. 112(1), pages 301-326, May.

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