Abstract
Long-term shoreline changes of the Kita-shitaura and Miura coasts were investigated on the basis of the aerial photographs and field observations. Beach erosion has been severe on the Kita-shitaura coast, because of the recurrent dredging of the navigation channel of Kita-shitaura fishing port and the disposal. In contrast, on the Miura coast, dredged materials were placed on the shoreline, resulting in widening of the foreshore. Thus, in this area, sand balance has been lost due to the anthropogenic factors. To improve this situation, the recycling of dredged sand is required instead of constructing hard structures.
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