Abstract
Beach changes along a 7-km-coastline between the Minato River in Kazusaminato and Isone Point facing Uraga Strait were investigated using aerial photographs and by field observations. The relation between beach changes and the collaption of sea cliffs extending along the coastline were investigated. In particular, after the 2011 Great Earthquake, sea cliffs were newly collapsed owing to heavy rainfalls and additional earthquakes, and a large amount of sand was supplied to the coast. Also beach erosion was further intensified by the decrease in sand supply from upcoast.
