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This study focused on the improvement of sediment transport by excavation of the causeway located in the northern part of Fongafale Islet, in order to increase the lagoonal sediment transport. Then, accretion due to excavation was evaluated numerically. Consideration of effective excavation width indicated that the most desirable width is around 30m. Even if the excavation width is increased more than 30m, the longshore sediment transport didn't increase. Excavation of the causeway increased lagoonal sediment transportation and it accelerated lagoonal accumulation. Calculated results indicated that the excavation of causeway is effective for improvement of longshore sediment transport, and it connects to sustainable conservation of lagoonal coast in Fongafale Islet.

IMPROVEMENT OF SEDIMENT TRANSPORT BY OPEN CUT OF CAUSEWAY IN FUNAFUTI ATOLL, TUVALU