A method to consider causes of beach changes from limited field data the example of Katase-higashi beach, Koyurugi Point and Shichiriga-hama beach

Abstract

A method to consider the causes of beach changes from the limited field data is introduced by taking the Katase-higashi and Shichiriga-hama beachs in Kanagawa Prefecture as the examples. Aerial photographs were read and shoreline changes were studied. Sounding maps taken in different years were compared. Field observation was carried out to investigate present shoreline situation. Based on these limited field data, it is found that seasonal, cyclic beach changes are dominating on the Shichirigahama beach, and net sand loss is caused by wind blown sand.