Tsunami Bore Overtopping Of Coastal Structures

Conference paper (2018)

Authors

Miguel Esteban University of Tokyo
Tomoyuki Takabatake Waseda University
Tomoya Shibayama Waseda University
Bas Hofland Deltares, Hydraulic Structures and Flood Risk - CEG
Yuta Nishida Waseda University
Shinsaku Nishiazaki Waseda University
Jacob Stolle University of Ottawa
Ioan Nistor University of Ottawa
Hiroshi Takagi Tokyo Institute of Technology
J.D. Bricker Hydraulic Structures and Flood Risk - CEG
Research Group
Hydraulic Structures and Flood Risk (CEG) (TU Delft)
Copyright: © 2018 Miguel Esteban, Tomoyuki Takabatake, Toni Glasbergen, Bas Hofland, Yuta Nishida, Shinsaku Nishiazaki, Jacob Stolle, Ioan Nistor, Hiroshi Takagi, J.D. Bricker, Tomoya Shibayama
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Published Date

2018

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Hydraulic Engineering

Research Group

Hydraulic Structures and Flood Risk

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.

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