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Investigation of Tsunami Overtopping a Coastal Embankment

Author(s): Nguyen Xuan Dao; Mohammad Bagus Adityawan; Hitoshi Tanaka

Linked Author(s): Hitoshi Tanaka

Keywords: Numerical simulation; Experiment; Tsunami; Overflow; Coastal embankment

Abstract: The Great East Japan Earthquake with M9 magnitude on March 11th, 2011 has provided valuable practical lessons on the huge consequences and potential impacts of megaearthquakes and megatsunamis. Sea dikes and breakwaters along the affected coast were destroyed due to this devastating earthquake and tsunami. It is important to understand the wave interaction with onshore and offshore structures in mitigating the the impact of tsunamis. Tsunami-induced wave force is one of the main factors in coastal embankment failures. Numerical model is a valuable tool to investigate the cause of coastal damages. In this study, NEWFLUME model based on Reynolds Averaged Navier Stokes (RANS) equations is applied to investigate flow fields induced by tsunami overtopping a coastal embankment. The numerical simulation results were then compared with those from hydraulics experiments. Comparison of the flow fields, piezometric head and water level showed a good agreement with the experimental results.


Year: 2014

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