Beach Changes on Small-scale Pocket Beaches Located on West Shore of Miura Peninsula

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  • 三浦半島西岸の小規模なポケットビーチでの海浜変形の実態
  • ミウラ ハントウ セイガン ノ ショウキボ ナ ポケットビーチ デ ノ カイヒン ヘンケイ ノ ジッタイ

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Abstract

Beach changes of five pocket beaches located on the west shore of Miura Peninsula were investigated through the comparison of aerial photographs and bathymetric survey data. The clockwise rotation of the shoreline was observed on each beach, resulting in shoreline recession in the north part of the beach, whereas accretion in the south part. It was found that a port breakwater or a river mouth jetty was extended at the south end of the pocket beach under the conditions of the oblique wave incidence from the southwest. To mitigate both beach erosion in the north part and accretion in the south part, sand recycling is required.

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