Masahiro KOBAYASHI, Yoshitaka MURAKAMI, Takahisa TAMURA, Masatoshi IZUMI 1 神奈川県横須賀土木事務所(〒238-0022 神奈川県横須賀市公郷町1-56-5) 2 正会員 博(工) 国際航業株式会社 環境・エネルギー事業部 (〒183-0057 東京都府中市晴見町2-24-1) The Akiya coast on Kanagawa Prefecture is located in the west coast of the Miura peninsula where it faces the Sagami bay, and is a coast like the pocket beach of the coastline extension about 1.2km. The countermeasures against erosion were examined in the conference that consisted of the local inhabitants, the fishermen,

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... the coast users, and the administration, etc. from 2003, the beach nourishment with gravel was planned, and the gravel beach nourishment of about 40,000m 3 was executed from 2007 to 2010. The median grain size was about 15mm and the amounts of the plan beach nourishment were about 80,000m 3 . The monitoring survey results suggested that gravel moved longshore at the speed more than the expectation, but hardly flowed out to 1m in depth offing, and roundness of gravel which was shown by the standard deviation of width and thickness to the major axis and the major axis length became almost 0.3.