Coastal Structures and Solutions to Coastal Disasters Joint Conference 2015
Experimental Study on Tsunami Characteristics Flowing over Coastal Dikes with Different Shapes
Publication: Coastal Structures and Solutions to Coastal Disasters 2015: Tsunamis
ABSTRACT
Lessons from the 2011 Tohoku Earthquake Tsunami disaster highlighted the importance of stable coastal dikes against overflowing tsunami. While a dike with sloping faces may enhance such stability, it may weaken dike’s function to reduce the overflow. This study carried out laboratory experiments to investigate how sloping faces of the dike affect the overflow characteristics. Through the experiment, we found: (i) sloping faces on both side of the dike clearly increase the overflow rate and the fluid force of the inundating flow and bring forward the arrival time of the first runup flow; (ii) sloping front face is the dominant factor to increase the overflow rate; (iii) a vertical wall type dike has the best ability in reduction of the overflow. These findings suggest that designs of optimum dikes need to account for such trade-off relationship between stability and damage-reduction effects of dikes.
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ACKNOWLEDGEMENT
Authors would like to acknowledge that a part of this study was supported by The University of Tokyo Ocean Alliance and Nippon Foundation. The laboratory experiment of this study was also supported by Promotion Program for Scientific Fire and Disaster Prevention Technologies.
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Published In
Coastal Structures and Solutions to Coastal Disasters 2015: Tsunamis
Pages: 246 - 257
Editors: Louise Wallendorf, U.S. Naval Academy and Daniel T. Cox, Ph.D., Oregon State University
ISBN (Online): 978-0-7844-8031-1
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© 2017 American Society of Civil Engineers.
History
Published online: Jul 11, 2017
Published in print: Jul 11, 2017
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