Abstract
Kujukuri Beach with a 60 km length located in Boso Peninsula has an arc-shaped accretive shoreline and has been formed mainly owing to the sand supply from sea cliffs. On south Kujukuri Beach, severe beach erosion has occurred since the 1970s and the erosion area has been expanding. The exhaustion of sand supply by northward longshore sand transport from the sea cliffs, formation of a wave-shelter zone at Katakai fishing port breakwater and ground subsidence caused by the pumping-up of underground water are the major causes of the shoreline recession. A meeting point of longshore sand transport from both directions is predicted from the predominant wave direction and coastline configuration. Then, the arc-shaped shoreline of Kujukuri Beach is reproduced given these conditions using the contour-line-change model. Beach changes caused by various anthropogenic factors were reproduced using the model. The predicted shoreline changes were in good agreement with the measured data.
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