Tsunami Bore Overtopping Of Coastal Structures

Miguel Esteban, Tomoyuki Takabatake, Toni Glasbergen, Bas Hofland, Yuta Nishida, Shinsaku Nishiazaki, Jacob Stolle, Ioan Nistor, Hiroshi Takagi, Jeremy Bricker, Tomoya Shibayama

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

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Abstract

In the aftermath of the 2011 Tohoku Earthquake and Tsunami Japanese tsunami protection philosophy now dictates that coastal defences should prevent the land that they protect from being flooded under a Level 1 event (with a return period in the order of about 100 years). To ascertain the overtopping mechanism and leeward inundation heights of tsunamis as they hit coastal structures, the authors conducted physical experiments using a dam-break mechanism, which could generate bores that overtopped different types of structures. Three different types of structures were considered, namely a wall of “infinite” height, a coastal dyke, and a vertical tsunami wall. The results show that the velocity of the tsunami bore is crucial in determining whether the structure will be overtopped or not, and thus it is imperative to move away from only considering
the tsunami inundation height at the beach.
Original languageEnglish
Title of host publicationProceedings of the 7th International Conference on the Application of Physical Modelling in Coastal and Port Engineering and Science (Coastlab18)
Subtitle of host publicationSantander, Spain, May 22-26, 2018
Number of pages10
Publication statusPublished - 2018

Keywords

  • tsunami bores
  • overtopping
  • dam break
  • coastal dykes
  • laboratory experiments

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