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In this study, firstly, the field observation was executed on wave, current and concentration of silty sand in the sea area around the harbor of the Haramachi-thermal power plant site of Tohoku Electric Power Company and in front of the Nitta River and the sea cliff, which are surmised as silt sources. The actual situation of erosion of the sea cliff due to waves is investigated by using the aerial laser beam survey. The physical mechanism of migration of silty sand into the harbor and the supply mount of silty sand are estimated from the field observation results. The facilities of the Tohoku Electric Power Company have stood on the land behind the above sea cliff. So, prevention of the sea cliff from more erosion should be focus for the above facilities. Secondly, the beach deformation numerical model was modified in order to consider supply of siltation from the sea cliff. Finally, using the modified numerical model, effects of siltation supply from the sea cliff on accretion amount and seabed change around the harbor are investigated during a year.

INVESTIGATION OF EFFECTS OF SILTATION SUPPLY FROM A SEA CLIFF ON SAND DEPOSITION INSIDE A HARBOR BY FIELD OBSERVATION AND NUMERICAL SIMULATION