Coastal Structures and Solutions to Coastal Disasters Joint Conference 2015
Study on Tsunami Scour at the Landward Toe of a Coastal Dike and the Tsunami Force on Its Armor Blocks
Publication: Coastal Structures and Solutions to Coastal Disasters 2015: Tsunamis
ABSTRACT
To establish a numerical analysis method for quantifying the resilience of coastal dikes, tsunami overflow on a coastal dike and resulting local scouring at its landward toe were investigated using a three-dimensional coupled fluid-structure-sediment-seabed interaction model and its verification hydraulic experiments. From a comparison between numerical results and experimental data, the predictive capability of the model was demonstrated in terms of water surface fluctuation and the profile of a scour hole after the tsunami overflow. Furthermore, it was found that armor blocks below the crown and the berm on the landward slope of the dike received large landward and upward force because of an increase in pore-air pressure inside the dike and a decrease in water pressure induced by the separation of flow, suggesting that these blocks would be vulnerable against the tsunami overflow.
Get full access to this article
View all available purchase options and get full access to this chapter.
ACKNOWLEDGEMENTS
This research was supported by the Ministry of Land, Infrastructure, Transport and Truism of Japan under the Research and Development of River and Sediment Control Technology (Coastal Technology Field).
REFERENCES
Bear, J. (1972). Dynamics of Fluids in Porous Media. American Elsevier Pub. Co., New York, 764 p.
Chock, G., Robertson, I., Kriebel, D., Francis, M., and Nistor, I. (2013). Tohoku, Japan, Earthquake and Tsunami of March 11, 2011: Performance of Structures under Tsunami Loads, ASCE, 330 p.
Hatogai, S., Suwa, Y., and Kato, F. (2012). “Hydraulic model experiments on scour landward of the coastal dike induced by tsunami overflow.” Journal of JSCE, Series B2 (Coastal Engineering), 68, 406-410 (in Japanese).
Kajishima, T. and Takiguchi, S. (2002). “Interaction between particle clusters and particle-induced turbulence.” International Journal of Heat and Fluid Flow, 23, 639-646.
Kotake, Y. and Isobe, M. (2012). “Experimental study on pressure distribution along landward slope of coastal dike due to tsunami overflow.” Journal of JSCE, Series B2 (Coastal Engineering), 68, 891-895 (in Japanese).
Kunugi, T. (2000). “MARS for multiphase calculation.” Computational Fluid Dynamics Journal, 9(1), 1-10.
Mizutani, N., McDougal, W. G., and Mostafa, A. M. (1996). “BEM-FEM combined analysis of nonlinear interaction between wave and submerged breakwater.” Proc., 25th International Conference on Coastal Engineering, ASCE, 2377-2390.
Nakamura, T. and Mizutani, N. (2014). “Development of fluid-sediment-seabed interaction model and its application.” Proc., 34th International Conference on Coastal Engineering, ASCE, 34, sediment.85, E93.
Nakamura, T. and Yim, S. C. (2011). “A nonlinear three-dimensional coupled fluid-sediment interaction model for large seabed deformation.” Journal of Offshore Mechanics and Arctic Engineering, ASME, 133(3), 031103-1-031103-14.
Nakao, H., Sato, S., and Yeh, H. (2012). “Laboratory study on destruction mechanisms of coastal dyke due to overflowing tsunami.” Journal of JSCE, Series B2 (Coastal Engineering), 68, 281-285 (in Japanese).
Information & Authors
Information
Published In
Coastal Structures and Solutions to Coastal Disasters 2015: Tsunamis
Pages: 128 - 136
Editors: Louise Wallendorf, U.S. Naval Academy and Daniel T. Cox, Ph.D., Oregon State University
ISBN (Online): 978-0-7844-8031-1
Copyright
© 2017 American Society of Civil Engineers.
History
Published online: Jul 11, 2017
Published in print: Jul 11, 2017
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.