Influence of Artificial Topographical Transformation on the Tide in the Seto Inland Sea, Japan
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 131, Issue 2
Abstract
The Seto Inland Sea is the largest enclosed sea in Japan. Numerous large-scale coastal developments such as land reclamation, bridge construction, and dredging have greatly changed the basin scale of the Seto Inland Sea since the 1960s. We investigated the interannual tidal variation during the last 40 years and studied the possible effects of modern coastal developments on the tide by using a one-dimensional tidal model. Interannual tidal variation has shown some very significant secular changes. The amplitude of the principal lunar semidiurnal constituent, , in the central portion of the sea increased from 1960 to the late 1980s and since then has been decreasing. In the eastern portion of the sea, on the other hand, the amplitude decreased up to the late 1980s and has since been increasing. The model showed that the secular changes from 1960 to the late 1980s could be attributed to the enhancement of response due to coastal development in the Seto Inland Sea. It further showed that secular changes after the late 1980s could be attributed to the weakening of the response due to coastal developments where the cross-sectional area is minimum in the Seto Inland Sea.
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Acknowledgments
The writers would like to express their appreciation to Dr. T. Fujiwara of Kyoto University for offering the numerical model. They also thank the Japan Oceanographic Data Center and Hiroshima Prefecture for supplying the data. We also extend our profound thanks to two reviewers for their many fruitful comments.
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Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 131 • Issue 2 • March 2005
Pages: 62 - 68
Copyright
© 2005 ASCE.
History
Received: Aug 25, 2003
Accepted: Jun 22, 2004
Published online: Mar 1, 2005
Published in print: Mar 2005
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