Beach Changes between Point Ryugu and Nakoso Fishing Port including Same River Mouth in Fukushima Prefecture

Abstract

Beach changes between Point Ryugu and Nakoso fishing port facing the Pacific Ocean in Fukushima Prefecture were investigated. The shoreline recession occurred in the study area between 1980 and 1990s was triggered by the construction of the offshore breakwater of Hirakata fishing port south of the coast due to its wave sheltering effect. Although artificial reefs were constructed on the Suga and Sekita coasts in the central part of the study area as a measure against beach erosion, their protective effect was limited because of the high wave sheltering effect of the offshore breakwater of the fishing port constructed at the south end of the coastline.