2021 Volume 77 Issue 2 Pages I_901-I_906
Artificial reefs with a crown width of 70 m and a crown depth of 1.3 m were constructed with a 40 m wide opening on the Agarie coast in Nago City, Okinawa, to reduce wave overtopping. Three impermeable groins of 100 m length were constructed concurrently with beach nourishment. After the construction, the beach was eroded due to storm waves associated with typhoons. Bottom sounding data measured before the construction and after the storm, the changes in longitudinal profiles and bottom contours were studied. Field observation was also carried out after Typhoon Maysak (2020) hit August 31, 2020. Based on the field data, future measures to reduce wave overtopping were discussed.
