Abstract
On september 30, 1994 typhoon 9426 hit the Kanto Plain and strong winds blowed for a long time with severe rainfall.Due to this typhoon lake level rapidly rose in Lake Hinuma in Ibaraki Prefecture and high waves were incident to seawalls.This study summarizes beach erosion caused by wave overtopping and the damages of wooden seawall located at Oyazawabana sand spit. Furthermore future measures to enhance the stability of bank protection are proposed.
