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Sandbar Migration and Shoreline Change on the Chirihama Coast, Japan

School of Environmental Design, Kanazawa University, Kakuma-Machi, Kanazawa 920-1192, Japan
Specified Nonprofit Corporation, The Society of Ocean Romantics, 1-18-11-1011 Kanda, Chiyoda-ku, Tokyo 101-0047, Japan
Public Works Department, Ishikawa Prefectural Government, 1-1 Kuratsuki, Kanazawa 920-8580, Japan
Author to whom correspondence should be addressed.
Academic Editor: Gerben Ruessink
J. Mar. Sci. Eng. 2016, 4(2), 40;
Received: 29 February 2016 / Revised: 28 April 2016 / Accepted: 13 May 2016 / Published: 3 June 2016
(This article belongs to the Special Issue Coastal Morphodynamics)
Sandy beaches play a key role in regional tourism. It is important to understand the principal morphological processes behind preserving attractive beaches. In this study, morphological variation on the Chirihama Coast, Japan, an important local tourism resource, was investigated using two sets of field surveys. The objective was to analyze and document the multi-scale behaviors of the beach. First, long-term shoreline changes were examined based on shoreline surveys over the last two decades. Then, the middle-term behavior of multiple bar systems was analyzed based on the cross-shore profile surveys from 1998 to 2010. An empirical orthogonal function (EOF) analysis was conducted to capture the principal modes of the systematic bar migration. The shoreline analysis indicated a long-term eroding trend and showed that the seasonal variation has recently tended to increase. The profile analysis demonstrated that net offshore migrations of bars have been repeated with a return period of approximately four years. This general behavior of the bar system is similar to the net offshore migration phenomena observed at other sites in the world. EOF analysis revealed a relationship between bar configuration and middle-term variations in shoreline location; when a new bar is generated near the shoreline and a triple bar configuration is established, the shoreline tends to temporarily retreat, whereas the shoreline experiences an advance when the outer bar has most evolved. View Full-Text
Keywords: multiple sandbars; periodic migration; shoreline change; beach profile multiple sandbars; periodic migration; shoreline change; beach profile
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Yuhi, M.; Matsuyama, M.; Hayakawa, K. Sandbar Migration and Shoreline Change on the Chirihama Coast, Japan. J. Mar. Sci. Eng. 2016, 4, 40.

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