Damages of Coastal Protection Facilities at Nyuzen Fishing Port by High Waves in February, 2008

Abstract

The main objects of this study are to investigate the causes of the damaged coastal protection facilities on February 24, 2008 and to verify the effects of sub sea walls, by using two specific numerical simulations; shallow water wave simulation with the Boussinesq model and two-dimensional numerical wave flume, CADMAS-SURF. In a result, the long-period waves, such as swells, caused high tide and high wave heights. The wave setup was estimated to be 80cm around submerged breakwater and wave height was estimated to be over 8.0m in front of submerged breakwater. The wave overtopping over seawall happened once 3minuts. In addition, the sub seawalls, which will be installed between main sea walls and colonies, are expected to be effective to reduce the total amount of wave overtopping quantity into colonies.