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Long-Term Recovery from the 2011 Great East Japan Earthquake and Tsunami Disaster Read chapter Read first chapter

2015 | OriginalPaper | Chapter

9. Effects of the Offshore Barrier Against the 2011 Off the Pacific Coast of Tohoku Earthquake Tsunami and Lessons Learned

Authors : Nobuhito Mori, Nozomu Yoneyama, William Pringle

Published in: Post-Tsunami Hazard

Publisher: Springer International Publishing

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Abstract

In this study, the effectiveness of an offshore breakwater for the 2011 off the Pacific Coast of Tohoku Earthquake Tsunami was examined by two-dimensional (2D), quasi three-dimensional (quasi-3D) and three-dimensional (3D) numerical models. First, both 3D numerical models were applied to the behavior of tsunami inundation for Kamaishi Bay in Iwate Prefecture where an offshore deep-water breakwater was installed against an assumed tsunami before 2011. The numerical results indicate 20 % error of maximum inundation height compared with the post-event tsunami survey on the land. It is found that the offshore breakwater significantly reduced the tsunami height on the land. The reduction of tsunami height on the land gave about 30 % tax revenue in comparison with similar locations with or without breakwater. Based on the results the construction and or rebuilding of damaged offshore breakwaters can be considered as a viable option against tsunami particularly in vulnerable areas.

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previous chapter The Tsunami Warning System in Thailand: A Part of the Reconstruction Process After the 2004 Indian Ocean Tsunami
next chapter A Method to Determine the Level 1 and Level 2 Tsunami Inundation Areas for Reconstruction in Eastern Japan and Possible Application in Pre-disaster Areas
Literature
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Yoneyama N, Mori N, Miwa M (2012) Numerical analysis of the 2011 off the Pacific Coast of Tohoku Earthquake Tsunami in Kamaishi Bay. J Jpn Soc Civil Eng, 5 p (in press) (in Japanese)
Metadata
Title
Effects of the Offshore Barrier Against the 2011 Off the Pacific Coast of Tohoku Earthquake Tsunami and Lessons Learned
Authors
Nobuhito Mori
Nozomu Yoneyama
William Pringle
Copyright Year
2015
Book
Post-Tsunami Hazard

Print ISBN: 978-3-319-10201-6

Electronic ISBN: 978-3-319-10202-3

Copyright Year: 2015

DOI
https://doi.org/10.1007/978-3-319-10202-3_9