Effect of Climate Change on Performance-Based Design of Caisson Breakwaters
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 138, Issue 3
Abstract
This paper presents a method to incorporate the effect of climate change on the performance-based design of a caisson breakwater and its application to the East Breakwater of the Port of Hitachinaka in Honshu, Japan. The up-to-date projection estimated a future sea-level rise of 0.25–0.6 m and a wave-height increase of 1.7 m (from 8.3 to 10 m) during the 21st century in this area. The influence of a sea-level rise on caisson sliding was minimal; the sea-level rise was much smaller than the water depth at the breakwater site. When the effects of climate change were not included, the performance-based design method calculated the same caisson width as that of the constructed breakwater, partly validating the consistency between conventional deterministic methods and performance-based design methods. The effects of climate change dictate an increase in caisson width of approximately 1.5 and 0.5 m for linear and parabolic increases of wave height, respectively, which are approximately 6.8 and 2.3% of the present caisson width of 22 m. Finally, it is recommended that the caisson breakwater be designed using the projected wave height and water level in 30 years from construction, if the deterministic design method is used and the effects of climate change are to be taken into account.
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Acknowledgments
This work was supported by the National Research Foundation of Korea Grant funded by the Korean Government (NRF-2010-013-D00074). KDS and SWK were also supported by the Project for Development of Reliability-Based Design Methods for Port and Harbor Structures sponsored by the Korea Ministry of Land, Transport and Marine Affairs. KDS, NM, and HM were also supported by the Kyoto University Global COE Program and Japanese Grant-in-Aid for Scientific Research, KAKENHI.
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Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 138 • Issue 3 • May 2012
Pages: 215 - 225
Copyright
© 2012. American Society of Civil Engineers.
History
Received: May 12, 2011
Accepted: Sep 14, 2011
Published online: Sep 17, 2011
Published in print: May 1, 2012
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