4.7 Article

Numerical study of the stability of breakwater built on a sloped porous seabed under tsunami loading

Journal

APPLIED MATHEMATICAL MODELLING
Volume 37, Issue 23, Pages 9575-9590

Publisher

ELSEVIER SCIENCE INC
DOI: 10.1016/j.apm.2013.05.006

Keywords

Earthquake; Tsunami; Breakwater; Porous seabed; Shear failure; Liquefaction; Japanese 311 earthquake

Funding

  1. Chinese 973 Project: Evolutionary Trends and Sustainable Utilization of Coral Reefs in the South China Sea [2013CB956104]
  2. EPSRC [EP/G006482/1]
  3. Overseas Research Student Award from Scottish Government, UK

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Strong earthquake induced huge tsunami has occurred for three times in Pacific ocean in recent ten years; for example, the tsunami triggered by the Sumatra earthquake in 2004, Chile earthquake in 2010 and Tohoku earthquake (Japan) in 2011. Tsunami carrying huge energy always would bring high risks to the population living near to coastline. Breakwater is widely used to dissipate the wave energy, and protect coastline and ports. However, they are vulnerable when being attacked by tsunami wave. At present, the interaction mechanism between tsunami, breakwater and its seabed foundation is not fully understood. In this study, the dynamics and stability of a breakwater under the attacking of tsunami wave is investigated by adopting an integrated model PORO-WSSI 2D, in which the VARANS equation for wave motion, and the Blot's dynamic equation for soil are used. Based on the numerical results, it is found that offshore breakwater interacts intensively with tsunami wave when it overtopping and overflowing over a breakwater. The impact force on the lateral side of breakwater applied by tsunami wave is huge. The shear failure is likely to occur in the seabed foundation of breakwater. The liquefaction is unlikely to occur due to the fact that there is basically no upward seepage force in seabed foundation in the process of tsunami wave passing through the breakwater. (C) 2013 Elsevier Inc. All rights reserved.

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