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Book Chapter

The rock coast of Japan

By
T. Sunamura
T. Sunamura
2-9-517 Namiki, Tsukuba 305-0044, Japan
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H. Tsujimoto
H. Tsujimoto
Department of Geography, Osaka Kyoiku University, Osaka 582-0026, Japan
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H. Aoki
H. Aoki
Faculty of Business Administration, Daito Bunka University, Higashi-Matsuyama 355-8501, JapanPresent address: Department of Geography, Tokyo Gakugei University, Tokyo 184-8501, Japan
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Published:
January 01, 2014

Abstract

The Japanese islands, situated in a tectonically unstable region with a highly variable geology, are exposed to high wave energy and microtidal environments in most locations. Rocky coasts are common, most having a steep cliff with coastal recession being primarily driven by wave erosion. A fundamental relationship between recession and wave force is obtained through reanalysis of previous laboratory data. On the basis of this relation a model is constructed for the development of type B platforms, that is, horizontal or subhorizontal platforms that have a steep scarp at the seaward edge. The process of wave attenuation on this type of platform and weathering-induced strength reduction of rocks are incorporated into the model. The model is applied to the southwestern coast of the Kii Peninsula and a platform at Ebisu-jima of the Izu Peninsula. Long-term development rates of platforms in the former area are examined: the model indicates that the rate of erosion when platforms were initiated at 6000 years BP is two orders of magnitude greater than present. At the Ebisu-jima platform, wave-induced erosion processes are explored on a daily basis: the model provides a description of temporal variations in platform growth, although the result is not fully satisfactory.

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Contents

Geological Society, London, Memoirs

Rock Coast Geomorphology: A Global Synthesis

D.M. Kennedy
D.M. Kennedy
The University of Melbourne, Australia
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W. J. Stephenson
W. J. Stephenson
University of Otago, New Zealand
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L. A. Naylor
L. A. Naylor
University of Glasgow, UK
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Geological Society of London
Volume
40
ISBN electronic:
9781862397002
Publication date:
January 01, 2014

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