In recent years、 wave overtopping is occurred by high waves in sand spit of Saroma faced Okhotsk Sea.This overtopping don’t case cutting off the sand spit because of rising height of sand spit by sediment deposition. But、 incerasing of waves energy owing to decreasing drift ice area and change of wave direction are important to think change of the topography of sand spit form analysis of existiong data of average tide level、 wind drift ice、 and waves. We conducted prediction of ocean waves using SWAN in the case of existing drift ice or no one. |