Field observation was carried out on beach erosion of the Shonan coast caused by Typhoons 9707 and 9709. This coast is located in Sagami Bay and therefore usually relatively calm waves are incident. However in 1997 unusual, high waves and long period waves generated by several typhoons attacked this coast. Beach was eroded away and high scarp was formed by the combination effect of high waves and longshore sand transport induced by obliquely incident waves.
