Abstract
Sandy beach at Hiroura in Lake Hinuma has been eroded owing to wind waves and ground subsidence by 20 cm during the 2011 Great Earthquake. As a measure against beach erosion, beach nourishment using 2000 m3 of riverbed material from the Kuji River was carried out in January 2013. Field observations were carried out on January 12, 2012 before the nourishment and September 30, 2014 after the nourishment to investigate the effect of the beach nourishment. In August 2016, four typhoon hit the area, causing the rapid rise in water level of the lake together with storm waves, resulting in severe beach erosion. In this study, the damage after 2016 typhoons was investigated on the basis of the field data. It was found that the lakeshore was severely eroded due to increased water level and high waves caused by strong wind.
