Abstract
Hakata Bay is located in nothern part of Kyushu Island. The area has been reduced by large reclamation since the beginning of twentieth century. Changes of the coastal line could have affected tide, tidal amplitude and sediment transport in an inner bay. We tried to clarify the effect using two approaches: (1) harmonic analysis of observational water level data at Hakata and Izuhara and (2) numerical experiments using a three-dimensional Princeton Ocean Model (POM). As a results of this study, it was clarified that tide, tidal current and sediment transport have changed near the Island City.
